Acta Materialia最新文献

{"title":"Activation of different twinning mechanisms and their contributions to mechanical behavior of a face-centered cubic Co-based high-entropy alloy","authors":"Mehrdad Ghiasabadi Farahani, Mohammadhossein Barati Rizi, Mahdi Aghaahmadi, Joo-Hee Kang, Sakari Pallaspuro, Leo Pentti Karjalainen, Jeoung Han Kim","doi":"10.1016/j.actamat.2024.120665","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120665","url":null,"abstract":"The microstructural evolution of a Co-based high-entropy alloy (HEA) was examined using electron microscopies, confirming the prominent presence of stacking faults (SFs) and deformation twins during compression. A novel twinning mechanism involving a local fcc → hcp transformation at the medium deformation stage was discovered, which had not been hitherto reported in HEAs. High-resolution scanning transmission electron microscopy revealed the conversion of a pre-twinned ε-martensite-like phase, featuring a local hcp structure, into a stable three-layer twin lamella through the nucleation of new SFs in between pre-existing ones. Additionally, as deformation progressed, the Niewzcas and Saada's pole mechanism of twinning was simultaneously activated, resulting in the formation of nano-twins within the HEA structure at higher deformation stages. The activation of both twinning mechanisms was analyzed by considering the concept of effective stacking fault energy, and stacking fault and twin fault probabilities, calculated through X-ray diffraction analysis at each deformation stage. Finally, the activation energy associated with dislocation-SFs and twin boundary interactions, as well as their respective influences on the strain-hardening behavior of the HEA at each deformation stage, were thoroughly investigated using thermally activated parameters obtained from cyclic stress relaxation experiments.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"41 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting and understanding vacancy-modified oxygen diffusion in dilute Ni-based alloys by first-principles calculations","authors":"Shun-Li Shang, Michael C. Gao, Zi-Kui Liu","doi":"10.1016/j.actamat.2024.120664","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120664","url":null,"abstract":"Controlling oxygen (O) diffusion is critical to materials synthesis, materials degradation, and their oxidation and hot corrosion protection. Herein we investigate O diffusion in dilute Ni-based alloys Ni₃₀VaXO by density functional theory (DFT) based transition state theory using a vacancy (Va) modified mechanism, where X represents 22 alloying elements. The diffusion jump rates are predicted by DFT-based phonon calculations and the quasiharmoinc approach (QHA). It is found that the reactive elements (e.g., Y, Hf, Al, and Cr) that form oxides easily increase O diffusivity while the noble Pt-group elements (e.g., Pt, Pd, Ir, and Rh) that are difficult to oxidize decrease O diffusivity in Ni-based alloys. These results indicate that the bonding strength between X and O, determinable by Ellingham diagram, plays a critical role in affecting O diffusion in Ni. Correlation analysis by means of linear fitting, sequential feature selection, and Shapley value indicates that O diffusivity in Ni₃₀VaXO connects closely to the electronic structures of alloying elements X, such as work function, electronegativity, and valence electrons. In addition, the identified outliers by correlation analysis are mainly alloying elements Y and Mn to correlate O diffusion in Ni₃₀VaXO.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"11 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Steel design based on a large language model","authors":"Shaohan Tian, Xue Jiang, Weiren Wang, Zhihua Jing, Chi Zhang, Cheng Zhang, Turab Lookman, Yanjing Su","doi":"10.1016/j.actamat.2024.120663","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120663","url":null,"abstract":"The success of artificial intelligence (AI) in materials research heavily relies on the integrity of structured data and the construction of precise descriptors. In this study, we present an end-to-end pipeline from materials text to properties for steels based on a large language model. The objective is to enable quantitative predictions of properties with high-accuracy and explore new steels. The pipeline includes a materials language encoder, named SteelBERT, and a multimodal deep learning framework that maps the composition and text sequence of complex fabrication processes to mechanical properties. We demonstrate high accuracy on mechanical properties, including yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) by predicting determination coefficients (R²) reaching 78.17% (±3.40%), 82.56% (±1.96%), and 81.44% (±2.98%) respectively. Further, through an additional fine-tuning strategy for the design of specific steels with small datasets, we show how the performance can be refined. With only 64 experimental samples of 15Cr austenitic stainless steels, we obtain an optimized model with R² of 89.85% (±6.17%), 88.34% (±5.95%) and 87.24% (±5.15%) for YS, UTS and EL, that requires the user to input composition and text sequence for processing and which outputs mechanical properties. The model efficiently optimizes the text sequence for the fabrication process by suggesting a secondary round of cold rolling and tempering to yield an exceptional YS of 960 MPa, UTS of 1138 MPa, and EL of 32.5%, exceeding those of reported 15Cr austenitic stainless steels.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"30 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142840751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing novel low-density high-entropy superalloys with high strength and superior creep resistance guided by automated machine learning","authors":"Yancheng Li, Jingyu Pang, Zhen Li, Qing Wang, Zhenhua Wang, Jinlin Li, Hongwei Zhang, Zengbao Jiao, Chuang Dong, Peter K. Liaw","doi":"10.1016/j.actamat.2024.120656","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120656","url":null,"abstract":"Design of novel superalloys with low density, high strength, and great microstructural stability is a big challenge. This work used an automated machine learning (ML) model to explore high-entropy superalloys (HESAs) with coherent γ' nanoprecipitates in the FCC-γ matrix. The database samples were firstly preprocessed via the domain-knowledge before ML. Both autogluon and genetic algorithm methods were applied to establish the relationship between the alloy composition and yield strength and to deal with the optimization problem in ML. Thus, the ML model can not only predict the strength with a high accuracy (<em>R</em>² &gt; 95 %), but also design compositions efficiently with desired property in multi-component systems. Novel HESAs with targeted strengths and densities were predicted by ML and then validated by a series of experiments. It is found that the experimental results are well consistent with the predicted properties, as evidenced by the fact that the designed Ni-5.82Fe-15.34Co-2.53Al-2.99Ti-2.90Nb-15.97Cr-2.50Mo (wt.%) HESA has a yield strength of 1346 MPa at room temperature and 1061 MPa at 1023 K and a density of 7.98 g/cm³. Moreover, it exhibits superior creep resistance with a rupture lifetime of 149 h under 480 MPa at 1023 K, outperforming most conventional wrought superalloys. Additionally, the coarsening rate of γ' nanoprecipitates in these alloys is extremely slow at 1023 K, showing a prominent microstructural stability. The strengthening and deformation mechanisms were further discussed. This framework provides a new pathway to realize the property-oriented composition design for high-performance complex alloys via ML.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"10 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plastic flow in Fe-Cr-Ni austenitic steel under the presence of solute H: A study via room temperature creep","authors":"Yuhei Ogawa, Akinobu Shibata","doi":"10.1016/j.actamat.2024.120659","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120659","url":null,"abstract":"A connection between the effects of solute hydrogen (H) on macroscopic flow stress and microscopic dislocation mobility has been a subject for understanding the plastic flow behavior of H-charged austenitic steels and other face-centered cubic (FCC) alloys. In this study, we try to solve this problem by examining the room temperature creep of a Fe-24Cr-19Ni-based Type310S austenitic stainless steel uniformly charged with 9000 at. ppm solute H in a pressurized gaseous H₂ environment. Stress-dip test to decompose the flow stress into effective (thermal) and internal (athermal) stresses, as well as a brief analysis of dislocation structure development in deformed uncharged and H-charged samples by electron channeling contrast imaging and hardness measurement, were supplementally employed. It is emphasized that solute H atoms consistently act as short-range obstacles hindering the movement of dislocations and thereby causes significant solid solution-hardening. Nevertheless, two opposite H-effects to accelerate and retard the creep rate were macroscopically identified depending on whether the stress level applied to H-charged specimens is above or below the flow stress under non-charged condition. These newly found, seemingly contradicting phenomena were interpreted based on the stress-dependent change of the rate-controlling mechanisms predominating thermally activated dislocation motion. Primary rate-controlling obstacles are H atoms themselves when creep acceleration manifests at high stress, while H atoms, other alloying elements, and forest dislocations cooperatively work to retard creep under low stress. The potential model of dislocation motion under the presence of these multiple obstacle types is finally proposed.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"64 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Y solutes on the activation of the {112̄1}〈1̄1̄26〉 deformation twinning in MgY solid solution alloys","authors":"Jianwei Xiao, Junjie Gao, Songwei Li, Rui Wang, Chuang Deng, Yuntian Zhu, Zhaoxuan Wu","doi":"10.1016/j.actamat.2024.120648","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120648","url":null,"abstract":"The &lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;〈&lt;/mo&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;6&lt;/mn&gt;&lt;mo is=\"true\"&gt;〉&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; deformation twin is common in nominally pure HCP Ti, Zr, Re, Co, but not in Mg. Rare-earth (RE) solutes such as Y and Gd at low atomic concentrations, however, can activate this twin mode and make it competitive to the regular &lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;〈&lt;/mo&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;〉&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; extension twin in Mg. Previously models have not explicitly revealed the role of RE solutes on twinning and the RE-effects remain poorly understood. Using a reduced-constraint (RC) slip path, DFT calculations and two newly-developed interatomic potentials for MgY and MgAl, we reveal the physical origin of the RE solute effects in activating the &lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;〈&lt;/mo&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace is=\"true\" width=\"0.16667em\"&gt;&lt;/mspace&gt;&lt;mover accent=\"false\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo accent=\"true\" is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mspace","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"27 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic profiling of intermittent plasticity","authors":"Mostafa M. Omar, Jaafar A. El-Awady","doi":"10.1016/j.actamat.2024.120646","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120646","url":null,"abstract":"Unraveling the complexities of metal deformation requires a deep understanding of dislocation dynamics and their intermittent behavior. Here, high-resolution acoustic emission (AE) measurements during <em>in situ</em> microcompression of Ni single-crystal micropillars are used to reveal new insights into the rapid deformation dynamics of dislocation avalanches. Spectral analysis of the AE signals uncovers multiple short waves during individual strain bursts, exposing a rich landscape of intermittent plasticity that was previously hidden. Our analysis identifies distinct acoustic signatures that correlate with various stages of deformation: early-stage large avalanches generate strong AE bursts, while later stages characterized by denser dislocation networks emit AE signals of lower amplitude. Notably, given the used sensor, a consistent AE frequency band ranging from 30 to 50 kHz is observed across all recorded avalanches, directly linking this spectral feature to the kinematics of dislocations moving through the crystal lattice. These findings provide a non-destructive characterization approach of dislocation dynamics during the deformation of bulk metals and establish quantitative connections between defect dynamics and macroscopic deformation behavior. More broadly, this work highlights the potential for AE-based techniques to provide insights into the fundamental mechanisms of plasticity in crystalline materials.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"12 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of physical aging on ionic conductivity of network oxide glasses","authors":"Ricardo F. Lancelotti, Shih-Yi Chuang, Edgar D. Zanotto, Sabyasachi Sen","doi":"10.1016/j.actamat.2024.120658","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120658","url":null,"abstract":"This study investigates the effect of α-relaxation induced by physical aging due to a down-jump in fictive temperature (&lt;em&gt;T&lt;sub&gt;f&lt;/sub&gt;&lt;/em&gt;) on the alkali ion hopping dynamics and the resulting ionic conductivity in different network oxide glass-forming systems. Electrochemical impedance spectroscopy, differential scanning calorimetry, and density measurements were used to analyze this effect. Results from &lt;em&gt;ex situ&lt;/em&gt; and &lt;em&gt;in situ&lt;/em&gt; aging experiments show excellent agreement and demonstrate that α-relaxation during aging significantly reduces the ionic conductivity of the glass as its density increases and &lt;em&gt;T&lt;sub&gt;f&lt;/sub&gt;&lt;/em&gt; decreases. In single-alkali Li disilicate and Li metaphosphate glasses, the migration enthalpy &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mstyle mathvariant=\"normal\" is=\"true\"&gt;&lt;mi is=\"true\"&gt;&amp;#x394;&lt;/mi&gt;&lt;/mstyle&gt;&lt;msub is=\"true\"&gt;&lt;mi is=\"true\"&gt;H&lt;/mi&gt;&lt;mi is=\"true\"&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.432ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -796.9 2386.2 1047.3\" width=\"5.542ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-394\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(833,0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-48\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(831,-150)\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMATHI-6D\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mstyle is=\"true\" mathvariant=\"normal\"&gt;&lt;mi is=\"true\"&gt;Δ&lt;/mi&gt;&lt;/mstyle&gt;&lt;msub is=\"true\"&gt;&lt;mi is=\"true\"&gt;H&lt;/mi&gt;&lt;mi is=\"true\"&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mstyle mathvariant=\"normal\" is=\"true\"&gt;&lt;mi is=\"true\"&gt;Δ&lt;/mi&gt;&lt;/mstyle&gt;&lt;msub is=\"true\"&gt;&lt;mi is=\"true\"&gt;H&lt;/mi&gt;&lt;mi is=\"true\"&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; of ionic conduction remains constant after aging, while the migration entropy &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mstyle mathvariant=\"normal\" is=\"true\"&gt;&lt;mi is=\"true\"&gt;&amp;#x394;&lt;/mi&gt;&lt;/mstyle&gt;&lt;msub is=\"true\"&gt;&lt;mi is=\"true\"&gt;S&lt;/mi&gt;&lt;mi is=\"true\"&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.432ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -796.9 2168.2 1047.3\" width=\"5.036ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentCol","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"29 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural fragility and Curie-Weiss behavior distinguishing glass forming ability in Ti-based metallic alloys","authors":"N.A. Mauro, K.F. Kelton","doi":"10.1016/j.actamat.2024.120650","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120650","url":null,"abstract":"The results of synchrotron x-ray scattering studies of glass forming Ti&lt;sub&gt;40&lt;/sub&gt;Zr&lt;sub&gt;10&lt;/sub&gt;Cu&lt;sub&gt;36&lt;/sub&gt;Pd&lt;sub&gt;14&lt;/sub&gt; and Ti&lt;sub&gt;34&lt;/sub&gt;Zr&lt;sub&gt;11&lt;/sub&gt;Cu&lt;sub&gt;47&lt;/sub&gt;Ni&lt;sub&gt;8&lt;/sub&gt; (Vit101) liquids and glasses are presented. Containerless experiments on the liquids were made using electrostatic levitation, while the corresponding glasses were thermally cycled to measure and account for structural relaxation. The total structure factor and total pair-distribution functions were measured as a function of temperature for the two equilibrium and supercooled Ti-based liquids, and for the corresponding glasses from room temperature to their respective glass transition temperatures. The rate of structural ordering was determined from the rate of increase in the magnitude of the first peak in the X-ray structure factors with decreasing temperature. Structural fragility is observed in these systems, with the magnitude of the fragility factor inversely correlated with the glass forming-ability. The amplitude of the first peak in the x-ray static structure factor in both alloys displays evidence for a Curie-Weiss type behavior. A proposed order parameter distinguishing glass-forming ability, &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;S&lt;/mi&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mi is=\"true\"&gt;T&lt;/mi&gt;&lt;mo is=\"true\"&gt;,&lt;/mo&gt;&lt;msub is=\"true\"&gt;&lt;mi is=\"true\"&gt;q&lt;/mi&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/msub&gt;&lt;mo is=\"true\"&gt;)&lt;/mo&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"3.24ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -1045.3 6981.4 1395\" width=\"16.215ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-28\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(389,0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-53\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(645,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-28\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1035,0)\"&gt;&lt;use xlink:href=\"#MJMATHI-54\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1739,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-2C\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(2184,0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-71\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(446,-150)\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(3085,","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"29 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"〈110〉{1̄10} edge dislocations in strontium titanate: Charged vs neutral, glide vs climb","authors":"Pierre Hirel, Patrick Cordier, Philippe Carrez","doi":"10.1016/j.actamat.2024.120636","DOIUrl":"https://doi.org/10.1016/j.actamat.2024.120636","url":null,"abstract":"The ductile deformation of strontium titanate SrTiO&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\" /&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -399.4 453.9 649.8\" width=\"1.054ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(0,-150)\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-33\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; at low temperature (&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;T&lt;/mi&gt;&lt;mo linebreak=\"goodbreak\" linebreakstyle=\"after\" is=\"true\"&gt;&amp;#x2A85;&lt;/mo&gt;&lt;mn is=\"true\"&gt;1000&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.779ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -846.5 4040.6 1196.3\" width=\"9.385ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-54\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(982,0)\"&gt;&lt;use xlink:href=\"#MJAMS-2A85\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(2038,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;use x=\"500\" xlink:href=\"#MJMAIN-30\" y=\"0\"&gt;&lt;/use&gt;&lt;use x=\"1001\" xlink:href=\"#MJMAIN-30\" y=\"0\"&gt;&lt;/use&gt;&lt;use x=\"1501\" xlink:href=\"#MJMAIN-30\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;T&lt;/mi&gt;&lt;mo is=\"true\" linebreak=\"goodbreak\" linebreakstyle=\"after\"&gt;⪅&lt;/mo&gt;&lt;mn is=\"true\"&gt;1000&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;T&lt;/mi&gt;&lt;mo linebreak=\"goodbreak\" linebreakstyle=\"after\" is=\"true\"&gt;⪅&lt;/mo&gt;&lt;mn is=\"true\"&gt;1000&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; K) is commonly associated with the activity of dislocations gliding in &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;110&lt;/mn&gt;&lt;mo is=\"true\"&gt;}&lt;/mo&gt;&lt;/","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"245 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}