Scripta Materialia最新文献_第8页

Three-dimensional faceted boundaries of {101¯2} twins in hcp Ti and Mg

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-30 DOI: 10.1016/j.scriptamat.2025.116579

S.J. Wang , C. Ding , R.J. McCabe , L. Capolungo , C.N. Tomé

引用次数: 0

In-situ TEM observation of -axis extension twin formation at grain boundaries

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-29 DOI: 10.1016/j.scriptamat.2025.116575

Hidetoshi Somekawa , Yuka Hara , Taku Moronaga , Alok Singh , Takahito Ohmura

{"title":"In-situ TEM observation of <c>-axis extension twin formation at grain boundaries","authors":"Hidetoshi Somekawa , Yuka Hara , Taku Moronaga , Alok Singh , Takahito Ohmura","doi":"10.1016/j.scriptamat.2025.116575","DOIUrl":"10.1016/j.scriptamat.2025.116575","url":null,"abstract":"<div><div>Effect of grain boundaries on {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></math></span>} twin formation and its mechanical response in Mg is investigated through in-situ TEM compression test. Compression direction is set to be normal to the <<em>c</em>>-axis, which is a favorable orientation to form {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></math></span>} twins. In case of a single crystal, <span><math><mrow><mo>{</mo><mn>10</mn><mover><mrow><mn>1</mn></mrow><mo>‾</mo></mover><mn>2</mn><mo>}</mo></mrow></math></span> twins form in the vicinity of the contact region of compression-tip with the specimen, as reported in previous studies. On the contrary, when the specimen has a grain boundary, this interfacial defect becomes the nucleation/formation site for twins. Stress required to form the twins is lower than that in a single crystal. Grain boundaries, which have a role in prevention of dislocation slips, create high stress fields; as a result, they lead to nucleation of a twin embryo. While twin nucleation is a probabilistic event, stress required to form the twins shows size effect.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116575"},"PeriodicalIF":5.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Revisiting the corrosion characteristics of B30 copper-nickel alloy under complete seawater exposure and crevice corrosion conditions: A comprehensive TOF-SIMS study of corrosion-product films

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-29 DOI: 10.1016/j.scriptamat.2025.116577

Ruyi Han, He Xie, Kunfeng Li, Ruoling Guan, Xiaowei Sun, Guobing Chen, Zichun Yang

引用次数: 0

Isotropic grain boundaries and size-dependent thermal stability of Schwarz crystals Cu and Al at nanoscales

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-27 DOI: 10.1016/j.scriptamat.2025.116572

Dan Yang , Zhipeng Gao , Fuling Tang , Zhaohui Jin

引用次数: 0

Melting temperature, emissivity, and thermal conductivity of rare-earth silicates for thermal and environmental barrier coatings

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-27 DOI: 10.1016/j.scriptamat.2025.116576

Hunter B. Schonfeld , Milena Milich , Cameron Miller , Laura Doumaux , Mackenzie Ridley , Thomas Pfeifer , William Riffe , Davide Robba , Luka Vlahovic , Konstantinos Boboridis , Rudy J.M. Konings , Adam Chamberlain , Elizabeth Opila , Patrick E. Hopkins

{"title":"Melting temperature, emissivity, and thermal conductivity of rare-earth silicates for thermal and environmental barrier coatings","authors":"Hunter B. Schonfeld , Milena Milich , Cameron Miller , Laura Doumaux , Mackenzie Ridley , Thomas Pfeifer , William Riffe , Davide Robba , Luka Vlahovic , Konstantinos Boboridis , Rudy J.M. Konings , Adam Chamberlain , Elizabeth Opila , Patrick E. Hopkins","doi":"10.1016/j.scriptamat.2025.116576","DOIUrl":"10.1016/j.scriptamat.2025.116576","url":null,"abstract":"<div><div>In recent years, rare-earth silicates have become the industry standard for coating state-of-the-art SiC ceramic matrix composite (CMC) gas turbine engine components, due to their low volatility, high melting point, and thermal shock resistance. Current research is focused on designing rare-earth silicate based thermal-environmental barrier coatings (T/EBCs) with improved resistance to CMAS (CaO-MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>), steam, and crack formation, while maintaining high temperature performance and stability. In this work we compare the high temperature performance of a variety of single and multi-component rare-earth mono- and disilicates (MS, DS) and rare earth apatites by measuring their melting points and spectrally averaged visible emissivities using laser heating and radiation pyrometry. We also report room temperature thermal conductivity measured by time-domain thermoreflectance (TDTR).</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"259 ","pages":"Article 116576"},"PeriodicalIF":5.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Structural superlubricity and dislocation bending behaviors of NiCoCr medium-entropy alloys with incommensurate contact

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-26 DOI: 10.1016/j.scriptamat.2025.116570

Wenyue Li , Jie Zhang , Shigenobu Ogata , Lei Gao , Xiongjun Liu , Zhaoping Lu

{"title":"Structural superlubricity and dislocation bending behaviors of NiCoCr medium-entropy alloys with incommensurate contact","authors":"Wenyue Li , Jie Zhang , Shigenobu Ogata , Lei Gao , Xiongjun Liu , Zhaoping Lu","doi":"10.1016/j.scriptamat.2025.116570","DOIUrl":"10.1016/j.scriptamat.2025.116570","url":null,"abstract":"<div><div>Structural superlubricity has emerged as an effective lubrication approach to reduce friction; however, it remains elusive whether this approach can be extended to multi-principal element alloys. In this study, we comprehensively investigated the frictional behaviors of NiCoCr medium-entropy alloy (MEA) tribo-pairs using molecular dynamics (MD) simulations. A substantial reduction in friction force, by at least one order of magnitude, was observed when the sliding interface twists from 0° to 2.5°. This reduction is primarily attributed to the continuous slipping of dislocations during the friction process. Furthermore, a nearly structural superlubricity state was achieved at the twist angle of 30°, with the friction coefficients of 0.003 and the absence of dislocations, which underscores the effectiveness and universality of forming an incommensurate interface. More importantly, the comparative study between NiCoCr and pure Ni clarified the pivotal role of dislocation bending in increasing the friction force of NiCoCr MEAs at small twist angles.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"259 ","pages":"Article 116570"},"PeriodicalIF":5.3,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of chemical composition on mechanical properties and shear band propagation in fully-amorphous ZrCu/ZrCuAl nanolaminates

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-24 DOI: 10.1016/j.scriptamat.2025.116571

Cristiano Poltronieri , Andrea Brognara , Chanwon Jung , Fatiha Challali , Philippe Djemia , Gerhard Dehm , James P. Best , Matteo Ghidelli

{"title":"Effect of chemical composition on mechanical properties and shear band propagation in fully-amorphous ZrCu/ZrCuAl nanolaminates","authors":"Cristiano Poltronieri , Andrea Brognara , Chanwon Jung , Fatiha Challali , Philippe Djemia , Gerhard Dehm , James P. Best , Matteo Ghidelli","doi":"10.1016/j.scriptamat.2025.116571","DOIUrl":"10.1016/j.scriptamat.2025.116571","url":null,"abstract":"<div><div>The mechanical behavior and propagation of shear bands (SBs) in fully amorphous ZrCu/ZrCuAl<sub>9</sub> nanolaminates with different nanoscale bilayer period (Λ, from 200 down to 50 nm) was investigated. The combined effect of local chemistry variation and nanointerface density influences the propagation of SBs and the mechanical behavior, reporting nanoindentation hardness values above the rule of mixtures, due to severe shear displacement and strong compositional intermixing along the SB-deformed zone with diffusion of Al into ZrCu layers. Enhanced plastic deformation (> 10 %) is observed for Λ = 100 and 200 nm during micropillar compression, but accompanied by a reduction of the yield strength. In contrast, for Λ = 50 nm, deformation is dominated by catastrophic SB events, while the yield strength returns to that of the monolithic films of ∼2–2.5 GPa. Our results can be utilized in design of nanostructured metallic glasses with tailored mechanical performance.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"259 ","pages":"Article 116571"},"PeriodicalIF":5.3,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-24 DOI: 10.1016/j.scriptamat.2025.116561

S.Y. Yuan , Y.Q. Yang , B.B. Zhang , K.G. Wang , Y.T. Zhu , X.Y. Li , Y. Zhang

引用次数: 0

Columnar-to-equiaxed transition in laser fusion additive manufacturing

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-23 DOI: 10.1016/j.scriptamat.2025.116565

Ankita Roy , Amit Kumar Singh , Amit Arora , B.A. McWilliams , Clara Mock , K.C. Cho , Rajiv S. Mishra

{"title":"Columnar-to-equiaxed transition in laser fusion additive manufacturing","authors":"Ankita Roy , Amit Kumar Singh , Amit Arora , B.A. McWilliams , Clara Mock , K.C. Cho , Rajiv S. Mishra","doi":"10.1016/j.scriptamat.2025.116565","DOIUrl":"10.1016/j.scriptamat.2025.116565","url":null,"abstract":"<div><div>Understanding columnar-to-equiaxed transition (CET) is a critical aspect of microstructural evolution in additively manufactured (AM) alloys, since proportions of columnar and equiaxed morphologies impact strength-ductility synergy. Traditional methodologies for CET prediction, primarily based on power-law relation between growth-rate and laser travel speed independent constitutional undercooling, have limitations in capturing transition domains at higher growth-rate, characteristic to AM. The existing Kurz-Giovanola-Trivedi (KGT) framework was leveraged as the basis for a modified CET model to predict microstructures more accurately for laser-directed energy deposition and powder-bed fusion for the whole laser-velocity domain. Two major alterations were implemented to modify the KGT model: first, undercooling was redefined by incorporating growth-rate and multi-component dependent thermo-kinetic parameters to radial, kinetic, thermal, and constitutional undercooling and second, marginal growth-rate instability domains were introduced. Compared to conventional KGT plot, the proposed model can provide better prediction for any AMed material, thus paving the way for designing location-specific microstructures.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"259 ","pages":"Article 116565"},"PeriodicalIF":5.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Accelerating the discovery of low-energy structure configurations: A computational approach that integrates first-principles calculations, Monte Carlo sampling, and Machine Learning

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-01-23 DOI: 10.1016/j.scriptamat.2024.116535

Md Rajib Khan Musa, Yichen Qian, Jie Peng, David Cereceda

{"title":"Accelerating the discovery of low-energy structure configurations: A computational approach that integrates first-principles calculations, Monte Carlo sampling, and Machine Learning","authors":"Md Rajib Khan Musa, Yichen Qian, Jie Peng, David Cereceda","doi":"10.1016/j.scriptamat.2024.116535","DOIUrl":"10.1016/j.scriptamat.2024.116535","url":null,"abstract":"<div><div>Finding Minimum Energy Configurations (MECs) is essential in fields such as physics, chemistry, and materials science, as they represent the most stable states of the systems. In particular, identifying such MECs in multi-component alloys considered candidate PFMs is key because it determines the most stable arrangement of atoms within the alloy, directly influencing its phase stability, structural integrity, and thermo-mechanical properties. However, since the search space grows exponentially with the number of atoms considered, obtaining such MECs using computationally expensive first-principles DFT calculations often results in a cumbersome task. To escape the above compromise between physical fidelity and computational efficiency, we have developed a novel physics-based data-driven approach that combines Monte Carlo sampling, first-principles DFT calculations, and Machine Learning to accelerate the discovery of MECs in multi-component alloys. More specifically, we have leveraged well-established Cluster Expansion (CE) techniques with Local Outlier Factor models to establish strategies that enhance the reliability of the CE method. In this work, we demonstrated the capabilities of the proposed approach for the particular case of a tungsten-based quaternary high-entropy alloy. However, the method is applicable to other types of alloys and enables a wide range of applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"259 ","pages":"Article 116535"},"PeriodicalIF":5.3,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0