Acta Materialia最新文献_第4页

Ultra-high strain under low driving field via synergetic design in high-entropy relaxor ceramics 通过高熵弛豫器陶瓷的协同设计实现低驱动场下的超高应变

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-16 DOI: 10.1016/j.actamat.2025.121047

Mikhail V. Talanov , Alexei A. Bokov , Irina N. Zakharchenko , Mikhail A. Marakhovsky

{"title":"Ultra-high strain under low driving field via synergetic design in high-entropy relaxor ceramics","authors":"Mikhail V. Talanov , Alexei A. Bokov , Irina N. Zakharchenko , Mikhail A. Marakhovsky","doi":"10.1016/j.actamat.2025.121047","DOIUrl":"10.1016/j.actamat.2025.121047","url":null,"abstract":"<div><div>Lead-containing relaxor ferroelectrics are distinguished by outstanding electromechanical properties, making them attractive for applications in modern electrostrictive actuators, piezoelectric transducers, multilayer ceramic capacitors, pyroelectric detectors and many others. Solid solutions of the relaxor–PbTiO<sub>3</sub> systems are of special interest due to the participation of different mechanisms of the energy profile flattening and the related property enhancement, manifesting at various length scales. Here, we report the ultra-high values of the electric field-induced strain under the low driving field (<em>S</em> > 0.1 % at <em>E</em> = 5 kV/cm) and with negligible hysteresis in the high-entropy relaxor ceramics. The large-signal piezoelectric coefficient <em>d</em><sub>33</sub>* = <em>S</em>/<em>E</em> = 2050 pm/V is the highest result ever reported in non-textured ceramic systems, and it is comparable with that of the [001]-oriented PbMg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub>–PbTiO<sub>3</sub> (PMN-PT) single crystals. The high electromechanical response is associated with a combination of several mechanisms of the energy profile flattening in the ceramic composition, which demonstrates the typical signs of pre-boundary state of crystal structure and properties behavior. The synergetic effect is achieved by the multicomponent system design based on the precise control and tuning of phase boundaries and polar states, as well as enhanced structural disorder via A- and B-site substitution in the parent PMN–PT system. The approach validated in this work is widely applicable to numerous relaxor-based systems for further enhancing their electric field-induced properties not limited to electromechanical response, but also including energy-storage characteristics and electrocaloric effect.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121047"},"PeriodicalIF":8.3,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841459","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}

引用次数: 0

Successive stress-induced phase transformations with large stress-strain hysteresis in single crystal Cu-Al-Mn shape memory alloys 单晶Cu-Al-Mn形状记忆合金中具有大应力-应变滞后的连续应力诱导相变

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-15 DOI: 10.1016/j.actamat.2025.121054

Hiroshi Akamine , Ryo Takamatsu , Sheng Xu , Toshihiro Omori , Ryosuke Kainuma , Sumio Kise , Kakeru Ninomiya , Maiko Nishibori , Minoru Nishida

{"title":"Successive stress-induced phase transformations with large stress-strain hysteresis in single crystal Cu-Al-Mn shape memory alloys","authors":"Hiroshi Akamine , Ryo Takamatsu , Sheng Xu , Toshihiro Omori , Ryosuke Kainuma , Sumio Kise , Kakeru Ninomiya , Maiko Nishibori , Minoru Nishida","doi":"10.1016/j.actamat.2025.121054","DOIUrl":"10.1016/j.actamat.2025.121054","url":null,"abstract":"<div><div>The successive stress-induced phase transformations in single-crystal Cu-Al-Mn alloys, which exhibit excellent superelasticity and ductility, were investigated using electron microscopy and synchrotron X-ray diffraction. In a Cu-16.8Al-9.6Mn (at.%) alloy, which is in the martensitic phase at room temperature, a stress-induced martensitic transformation from a 6M-type stacking structure to a 2M-type stacking structure was revealed. At the 6M and 2M interface, it was observed that structural changes progress with partial dislocations running every three layers within the 6M structure. A Cu-17Al-11Mn (at.%) alloy, which is in the parent L2<sub>1</sub> phase at room temperature and exhibits superelasticity, undergoes a successive stress-induced phase transformation of L2<sub>1</sub> → 6M → 2M, resulting in a shape recovery exceeding 16 % in strain. The 6M → 2M transformation leads to an expansion of the stress-strain hysteresis loop, thereby enhancing the energy dissipation capability. The microstructure observations suggest that deformation in the 2M phase and the complex form of the reverse transformation contribute to the energy dissipation.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121054"},"PeriodicalIF":8.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837508","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}

引用次数: 0

Revealing solidification behaviour and phase transformations in Fe60Co25Ni10Mo5 and Fe63Co26Ni11 alloys by using high-speed video and in situ X-ray diffraction"?> 利用高速视频和原位 X 射线衍射揭示 Fe60Co25Ni10Mo5 和 Fe63Co26Ni11 合金的凝固行为和相变"？

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-15 DOI: 10.1016/j.actamat.2025.121017

Shilei Liu , Victoria Kaban , Olof Gutowski , Thomas Volkmann , Kornelius Nielsch , Ivan Kaban

{"title":"Revealing solidification behaviour and phase transformations in Fe60Co25Ni10Mo5 and Fe63Co26Ni11 alloys by using high-speed video and in situ X-ray diffraction\"?>","authors":"Shilei Liu , Victoria Kaban , Olof Gutowski , Thomas Volkmann , Kornelius Nielsch , Ivan Kaban","doi":"10.1016/j.actamat.2025.121017","DOIUrl":"10.1016/j.actamat.2025.121017","url":null,"abstract":"<div><div>A combination of time-resolved synchrotron X-ray diffraction (XRD), high-speed video and electromagnetic levitation (EML) enabled revealing the solidification path and phase transformations in Fe<sub>60</sub>Co<sub>25</sub>Ni<sub>10</sub>Mo<sub>5</sub> and Fe<sub>63</sub>Co<sub>26</sub>Ni<sub>11</sub> alloys during heating and cooling. High-speed XRD provided direct evidence for nucleation of metastable δ-ferrite in undercooled liquid state and its quick transformation to γ-austenite. Addition of Mo clearly favours nucleation of δ-ferrite in Fe<sub>60</sub>Co<sub>25</sub>Ni<sub>10</sub>Mo<sub>5</sub> melts undercooled by Δ<em>T</em> of about 100 K and more. In contrast, primary crystallisation of any of δ and γ phases appears to be possible in Fe<sub>63</sub>Co<sub>26</sub>Ni<sub>11</sub> melts at all levels of undercooling. Neither Ni nor Mo exhibit any notable effect on the growth behaviour of δ and γ phases, which remains close to the one in the Fe<sub>60</sub>Co<sub>40</sub> base alloy. Alloying with Mo has a strong impact on the microstructure and solid state transformations in the Fe<sub>60</sub>Co<sub>25</sub>Ni<sub>10</sub>Mo<sub>5</sub> samples such as grain refinement at Δ<em>T</em> < 200 K, incomplete transformation of γ-austenite to α-ferrite, and formation of martensite at Δ<em>T</em> ≥ 330 K.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121017"},"PeriodicalIF":8.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830218","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}

引用次数: 0

Lattice distortion and atomic shuffle coupling of the R phase under grain size confinement in a Ni48Ti50Fe2 alloy 晶粒尺寸约束下Ni48Ti50Fe2合金中R相的晶格畸变和原子shuffle耦合

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-15 DOI: 10.1016/j.actamat.2025.121055

Yuxuan Chen , Xiaobin Shi , Junsong Zhang , Yunzhi Wang , Yang Ren , Feihong Chu , Shan Huang , Aobing Wang , Yue Wu , Shuzhi Zhang , Xinyu Zhang , Riping Liu , Yinong Liu

{"title":"Lattice distortion and atomic shuffle coupling of the R phase under grain size confinement in a Ni48Ti50Fe2 alloy","authors":"Yuxuan Chen , Xiaobin Shi , Junsong Zhang , Yunzhi Wang , Yang Ren , Feihong Chu , Shan Huang , Aobing Wang , Yue Wu , Shuzhi Zhang , Xinyu Zhang , Riping Liu , Yinong Liu","doi":"10.1016/j.actamat.2025.121055","DOIUrl":"10.1016/j.actamat.2025.121055","url":null,"abstract":"<div><div>The R phase in NiTi-based shape memory alloys is well known to exhibit a lattice distortion and an internal atomic shuffle relative to its parent B2 phase, yet over the past decades little is known of the correlation between these two structural changes. This study presents a first attempt to clarify their correlation in a nanocrystalline NiTiFe alloy. The lattice distortion produces a crystal shape change for the shape memory and pseudoelastic properties of these alloys and is subjected to the influences of mechanical constraint of a nanocrystalline matrix. In contrast, the internal atomic shuffle does not produce a crystal shape change, thus is not directly affected. This may cause decoupling of the two crystallographic changes. This study investigated the correlation between the two in the R phase by means of <em>in-situ</em> synchrotron high-energy XRD analysis and DFT calculations. The findings of this study provide new insights into the B2 → R transformation process in constrained environments and offers two significant implications. They help to understand many earlier observations of peculiar behaviour of the transformation, such as the pre-martensitic or precursor phenomena, the incommensurate and commensurate phases, and the R-like structures. They also help to guide the design of novel NiTi-based alloys of superior properties, such as NiTi strain glass alloys which are characteristic of severely suppressed lattice distortion transformation with significant atomic shuffle.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121055"},"PeriodicalIF":8.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837509","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}

引用次数: 0

Indentation stress fields in brittle materials: A micro-photoelastic investigation in silicate glasses 脆性材料中的压痕应力场：硅酸盐玻璃的微光弹性研究

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-14 DOI: 10.1016/j.actamat.2025.120973

Gustavo Alberto Rosales-Sosa , Etienne Barthel , Yoshinari Kato , Matthieu Bourguignon , Akihiro Yamada , Tomiki Inoue , Shingo Nakane , Hiroki Yamazaki

{"title":"Indentation stress fields in brittle materials: A micro-photoelastic investigation in silicate glasses","authors":"Gustavo Alberto Rosales-Sosa , Etienne Barthel , Yoshinari Kato , Matthieu Bourguignon , Akihiro Yamada , Tomiki Inoue , Shingo Nakane , Hiroki Yamazaki","doi":"10.1016/j.actamat.2025.120973","DOIUrl":"10.1016/j.actamat.2025.120973","url":null,"abstract":"<div><div>Indentation experiments have helped understand non-linear mechanical properties of brittle materials such as plasticity, damage and fracture. However, our understanding of stress fields under indentation remains limited due to the general lack of direct measurements. This study introduces a novel approach to characterizing indentation stress fields in silicate glasses by combining high sensitivity birefringence measurements, photoelastic calculations and finite element analysis (FEA). We extensively investigated the elastoplastic response of soda–lime–silicate (SLS) and silica glasses under different indentation conditions, highlighting the effects of composition and indenter geometry on the photoelastic distributions. To predict the photoelastic response under indentation, we carefully calibrated an elastoplastic constitutive relation for silicate glasses using a combination of high-pressure (up to 25 GPa) and nanoindentation experiments. Computed indentation stress fields can then be validated through the comparison of full 3D photoelastic calculations and measured birefringence patterns. One key finding is that the residual stresses arising from the calibrated constitutive relations offered a far more realistic representation of the indentation stress fields than a commonly used approximate analytical elastoplastic model. With this method, stress fields can be investigated not only in oxide glasses but also in any other transparent isotropic material. While the calculated stress fields were generally satisfactory for both glass compositions, they also evidenced that improvements in the constitutive relation are needed for amorphous silica, which is known to undergo significant densification.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 120973"},"PeriodicalIF":8.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831645","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}

引用次数: 0

Size- and stability-dependent fracture scaling in nanoscale metallic glass 纳米金属玻璃中与尺寸和稳定性相关的断裂结垢

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-14 DOI: 10.1016/j.actamat.2025.121046

Lechuan Sun , Shan Zhang , Rui Su , Yunjiang Wang , Pengfei Guan

{"title":"Size- and stability-dependent fracture scaling in nanoscale metallic glass","authors":"Lechuan Sun , Shan Zhang , Rui Su , Yunjiang Wang , Pengfei Guan","doi":"10.1016/j.actamat.2025.121046","DOIUrl":"10.1016/j.actamat.2025.121046","url":null,"abstract":"<div><div>Experiments show a significant size effect in the fracture modes of the metallic glass (MG) nanowires, while simulations often diverge due to differences in thermal histories caused by timescale issue of the classical molecular dynamics quenching methods. This leads to disparities between computational and experimental results. To address this, we used a hybrid molecular dynamics (MD) and Monte Carlo thermal cycling method to fabricate well-annealed MG nanowires with effective quenching rates significantly lower than those of MD-prepared samples. Our findings reveal that fracture mode transitions are strongly tied to thermal history. For high quenching rate samples, the fracture mode is only dictated by the aspect ratio (<em>L</em>/<em>D</em>) of nanowires, aligning with existing simulations. For low quenching rate samples, the critical factor determining fracture is the diameter (<em>D</em>), matching experimental observations. This resolves the discrepancies between simulations and experiments on size-dependent fractures in nanoscale MGs. Microscopic analysis links this variation to the intrinsic plastic zone width (<em>δ</em><sub>0</sub>), influenced by the aspect ratio in high rates but correlated solely with diameter in low rates. We propose a universal model for fracture scaling with size and thermal stability in nanostructured MGs.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121046"},"PeriodicalIF":8.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831704","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}

引用次数: 0

Grain boundary properties and microstructure evolution in an Al-Cu alloy Al-Cu合金的晶界性能与组织演变

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-12 DOI: 10.1016/j.actamat.2025.121041

Zipeng Xu , Jun Sun , Jules M. Dake , Jette Oddershede , Harpreet Kaur , S. Kiana Naghibzadeh , Carl E. Krill III , Kaushik Dayal , Gregory S. Rohrer

{"title":"Grain boundary properties and microstructure evolution in an Al-Cu alloy","authors":"Zipeng Xu , Jun Sun , Jules M. Dake , Jette Oddershede , Harpreet Kaur , S. Kiana Naghibzadeh , Carl E. Krill III , Kaushik Dayal , Gregory S. Rohrer","doi":"10.1016/j.actamat.2025.121041","DOIUrl":"10.1016/j.actamat.2025.121041","url":null,"abstract":"<div><div>Grain boundary (GB) properties in an Al-5 wt % Cu alloy have been extracted from diffraction contrast tomography images after 10 sequential annealing steps for 15 min at 630°C. At the annealing temperature, a copper-rich liquid was present at the GBs. The growth and shrinkage of the grains are strongly correlated with the grain size, and the velocity of individual boundaries is strongly correlated with boundary mean curvature, as expected from the classical theory of coarsening. The experimental results compare well to a threshold dynamics grain growth simulation of the process assuming uniform grain boundary energies. The correlation of the interface velocity and curvature is observed both for the data on average and for certain commonly occurring grain boundary disorientations. It is also found that the curvatures and relative areas of GBs depend on the five grain boundary parameters, even though the GBs are formed in conditions of low energy anisotropy. The observations are compared to results from grain growth in the solid state, where strong correlations between interface velocity and curvature are not observed.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121041"},"PeriodicalIF":8.3,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822442","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}

引用次数: 0

Local structure modification around Si atoms in Si-implanted monocrystalline β-Ga2O3 (100) under heated substrate conditions 加热衬底条件下Si注入单晶β-Ga2O3（100）中Si原子周围的局部结构修饰

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-11 DOI: 10.1016/j.actamat.2025.121036

I.N. Demchenko , Y. Syryanyy , A. Shokri , Y. Melikhov , J. Domagała , R. Minikayev , A. Derkachova , F. Munnik , U. Kentsch , M. Zając , A. Reck , N. Haufe , Z. Galazka

{"title":"Local structure modification around Si atoms in Si-implanted monocrystalline β-Ga2O3 (100) under heated substrate conditions","authors":"I.N. Demchenko , Y. Syryanyy , A. Shokri , Y. Melikhov , J. Domagała , R. Minikayev , A. Derkachova , F. Munnik , U. Kentsch , M. Zając , A. Reck , N. Haufe , Z. Galazka","doi":"10.1016/j.actamat.2025.121036","DOIUrl":"10.1016/j.actamat.2025.121036","url":null,"abstract":"<div><div>Doping of β-Ga<sub>2</sub>O<sub>3</sub> (100) with Si by ion implantation onto heated substrates is investigated. The study reveals complex ion beam-induced defect processes in β-Ga<sub>2</sub>O<sub>3</sub>, characterized by the formation of various defect types and their temperature-dependent transformation. By employing X-Ray Diffraction, Rutherford Backscattering Spectrometry, Particle-Induced X-Ray Emission, X-ray Absorption Near Edge Structure Spectroscopy, Transmission Electron Microscopy, and Density Functional Theory analyses, we examine lattice deformation, identify the local environment of dopants, assess electronic structure modifications, and verify the presence of extended defects induced by ion implantation. Our findings highlight the predominant contribution of substitutional and interstitial Si ions incorporated into complexes that act as donors manifesting n-type conductivity, while some fraction of the defects form complexes that act as traps for charge carriers. Notably, no monoclinic phase transformations were observed during implantation despite substrate temperature variations from 300 to 800 °C.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121036"},"PeriodicalIF":8.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820234","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}

引用次数: 0

Assessment of metadynamic recrystallization in single copper particle impacts by focused ion beam tomography 聚焦离子束层析成像技术评价单铜颗粒撞击中的元动力学再结晶

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-11 DOI: 10.1016/j.actamat.2025.121038

Veera Panova , Christopher A. Schuh

{"title":"Assessment of metadynamic recrystallization in single copper particle impacts by focused ion beam tomography","authors":"Veera Panova , Christopher A. Schuh","doi":"10.1016/j.actamat.2025.121038","DOIUrl":"10.1016/j.actamat.2025.121038","url":null,"abstract":"<div><div>We study single Cu-on-Cu impacts relevant to cold spray deposition and quantitatively analyze the metadynamic recrystallization (mDRX) that takes place after the impact by virtue of lingering impact adiabatic heat. Unlike prior studies, the current full 3D tomographic analysis of the mDRX volume shows that mDRX is extremely common in such impacts, although it is often missed when examining 2D sections. We also report an unexpected trend: there is a “sour spot” for mDRX at velocities about 20–40 % above the velocity for particle adhesion. This non-monotonic trend is contrary to the expectations based on increasing adiabatic heating with velocity. With a schematic model, we show that the trend can be explained on the basis of heat transfer: cooling of the heat-affected region is limited by transport through the bonded regions at the particle-substrate interface. Thus, bonding has a prominent role in the heat dissipation process and the best bonded particles most rapidly bulk quench, avoiding mDRX. The developed semi-empirical model aligns with the experimental findings and may help inform microstructural evolution during cold spray and post-spray processing.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121038"},"PeriodicalIF":8.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822443","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}

引用次数: 0

Dynamic fracture response of Cantor-derived medium entropy alloys 康托尔衍生中熵合金的动态断裂响应

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-04-11 DOI: 10.1016/j.actamat.2025.121037

Sheron S. Tavares , Jesse G. Callanan , David R. Jones , Daniel T. Martinez , James Valdez , Aomin Huang , Marc A. Meyers , Saryu J. Fensin

{"title":"Dynamic fracture response of Cantor-derived medium entropy alloys","authors":"Sheron S. Tavares , Jesse G. Callanan , David R. Jones , Daniel T. Martinez , James Valdez , Aomin Huang , Marc A. Meyers , Saryu J. Fensin","doi":"10.1016/j.actamat.2025.121037","DOIUrl":"10.1016/j.actamat.2025.121037","url":null,"abstract":"<div><div>The dynamic behavior for five Cantor-derived alloys with four elements in equiatomic composition was investigated. The composition was systematically modified to: CrMnFeNi, MnFeCoNi, CrMnCoNi, CrMnFeCo, and CrFeCoNi. Under identical homogenization, deformation, and recrystallization processing conditions, these materials exhibited significant differences in the microstructure and the corresponding mechanical response, which was measured through uniaxial stress compression loading at strain rates ranging from 10<sup>−4</sup> to 10<sup>3</sup> s<sup>−1</sup>. Additionally, spall recovery experiments were performed at strain rates of ∼10<sup>4</sup> s<sup>−1</sup> to further understand the effect of strain rate on damage and failure in tension. Four of the five alloys were face-centered cubic and exhibited ductile failure by void nucleation, growth, and coalescence, primarily at the grain boundaries. Surprisingly, the significant differences in compressive strength (ranging from ∼200 to ∼600 MPa at 10<sup>−4</sup> s<sup>−1</sup>) did not manifest themselves in the spall strength, which varied from 2.08 to 2.61 GPa (not including the CrMnFeCo alloy). This is attributed to similar processes of void growth, which occur at the scale of a few micrometers and do not incorporate the mesoscopic response (such as Hall-Petch), which determines the yield strength. One of the alloys, CrMnFeCo, exhibited especially low ductility in compression and fragmented into pieces during both compression and spall testing. This behavior was attributed to the formation of a brittle Sigma-like phase. The effect of both chemistry and processing was observed to affect the specific spall strength and damage evolution. Specifically, Cr segregation at the grain boundaries had a deleterious effect. This study provides a template for the choice of superior dynamic response among high and medium entropy alloys.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"292 ","pages":"Article 121037"},"PeriodicalIF":8.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820235","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}

引用次数: 0