Scripta Materialia最新文献_第5页

Deformation-induced amorphization and nanocrystallization in high-entropy alloys 高熵合金的形变诱导非晶化和纳米晶化

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-24 DOI: 10.1016/j.scriptamat.2025.116783

Bo Li, Nan Zi, Jiayin Zhao, Kaisheng Ming

{"title":"Deformation-induced amorphization and nanocrystallization in high-entropy alloys","authors":"Bo Li, Nan Zi, Jiayin Zhao, Kaisheng Ming","doi":"10.1016/j.scriptamat.2025.116783","DOIUrl":"10.1016/j.scriptamat.2025.116783","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) with exceptional cryogenic strength and toughness are pivotal for extreme engineering applications, yet their deformation mechanisms at ultra-low temperatures remain incompletely understood. Here, we report two types of deformation-induced amorphization and nanocrystallization within amorphous bands in a CrMnFeCoNi HEA under tensile loading at 4.2 K. Unlike dislocation-driven amorphization that forms nanoscale amorphous bands (nano-ABs, >5 nm thick), supra-nanometer amorphous bands (SN-ABs, <5 nm thick) emerge via lattice distortion under extreme localized shear localization rather than dislocation accumulation. Concurrently, localized heating from plastic deformation triggers nanocrystallization within nano-ABs, generating randomly oriented nanograins. The amorphization and nanocrystallization are expected to provide an extra toughening mechanism for HEAs by dissipating strain energy and impeding shear localization. Crucially, we establish a microstructural link between low-temperature serrated flow behavior and thermo-mechanical instability: stress drops and strain bursts correlate with heat-induced phase transitions and nano-ABs/SN-ABs formations.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116783"},"PeriodicalIF":5.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130885","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

Influence of nanostructuring through high-pressure torsion (HPT) on superconductivity of a high-entropy alloy 高压扭转纳米化对高熵合金超导性的影响

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-23 DOI: 10.1016/j.scriptamat.2025.116769

Kaveh Edalati , Alexy Bertrand , Payam Edalati , Thanh Tam Nguyen , Nariman Enikeev , Masaki Mito

{"title":"Influence of nanostructuring through high-pressure torsion (HPT) on superconductivity of a high-entropy alloy","authors":"Kaveh Edalati , Alexy Bertrand , Payam Edalati , Thanh Tam Nguyen , Nariman Enikeev , Masaki Mito","doi":"10.1016/j.scriptamat.2025.116769","DOIUrl":"10.1016/j.scriptamat.2025.116769","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) have emerged as favorable choices for different applications, including superconductors. The present work examines the impact of nanostructuring via high-pressure torsion (HPT) on the superconducting properties of the equiatomic TiZrHfNbTa HEA. Structural characterization reveals a progressive refinement of grain size and increased dislocation density, together with partial phase transformation to an ω phase with HPT processing. Magnetic susceptibility and magnetization measurements indicate a systematic enhancement in the superconducting transition temperature (from <em>T</em><sub>c</sub> = 6.2 K to 7.2 K) and critical magnetic field, as well as the stabilization of the superconductivity state by HPT processing. The improvement of superconducting properties is attributed to microstructural modifications such as grain boundary density, defect generation and phase transformations, and their impact on vortex pinning, quantum confinement and electron scattering. The results suggest that nanostructuring through severe plastic deformation provides an appropriate route to optimize superconducting properties in high-entropy superconductors.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116769"},"PeriodicalIF":5.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117029","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

Quantifying the contribution of dynamic strain aging to dislocation component for strain-hardening in high-carbon austenitic steels 动态应变时效对高碳奥氏体钢应变硬化中位错分量的定量贡献

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.scriptamat.2025.116767

Dong Liu , Dapeng Yang , Hongliang Yi

{"title":"Quantifying the contribution of dynamic strain aging to dislocation component for strain-hardening in high-carbon austenitic steels","authors":"Dong Liu , Dapeng Yang , Hongliang Yi","doi":"10.1016/j.scriptamat.2025.116767","DOIUrl":"10.1016/j.scriptamat.2025.116767","url":null,"abstract":"<div><div>This study explores and quantifies the dynamic pinning of dislocations by interstitial carbon (C) and its impact on the overall strain-hardening in high-C austenitic steels. By decoupling various strengthening mechanisms, a modified dynamic hardening component of interstitial solutes based on dislocation density was proposed, enabling an accurate capture of anomalous flow stress. By controlling the loading rate, the thermally activated behavior of dislocations and the reconstruction ability of Cottrell atmospheres were modulated. Results demonstrate that higher strain rates increase yield strength while reducing ultimate tensile strength and ductility. Microstructural analysis reveals a shift from dislocation cells to planar slip structures with rising strain rates, suggesting suppressed cross-slip. Elevated strain rates generate higher dislocation density while significantly lowering flow stress, challenging conventional substructure-based hardening laws. This work emphasizes the critical role of solute-dislocation interactions in dislocation hardening, addressing the strength underestimation in the classic Taylor hardening when solely considering forest dislocations.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116767"},"PeriodicalIF":5.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107306","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

Scalable and efficient consolidation of Al2O3 and SiC ceramics using a powder medium-based ultrafast high-temperature sintering (P-UHS) 粉末介质基超快高温烧结（P-UHS）制备Al2O3和SiC陶瓷的可扩展高效固结

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.scriptamat.2025.116768

Fei Zuo , Run-Dong Wu , Lin-Han Zhan , Ya-Ning Deng , Salvatore Grasso , Xiao-Lei Chen , Hua-Tay Lin

引用次数: 0

Predictive modeling of Néel temperature in austenitic alloys using CALPHAD and data analytics 基于CALPHAD和数据分析的奥氏体合金nsamel温度预测模型

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.scriptamat.2025.116773

Rangasayee Kannan , Peeyush Nandwana

{"title":"Predictive modeling of Néel temperature in austenitic alloys using CALPHAD and data analytics","authors":"Rangasayee Kannan , Peeyush Nandwana","doi":"10.1016/j.scriptamat.2025.116773","DOIUrl":"10.1016/j.scriptamat.2025.116773","url":null,"abstract":"<div><div>The Néel temperature is a crucial yet often overlooked parameter in calculating the stacking fault energy (SFE) of austenitic alloys. Several empirical equations have been proposed to estimate the Néel temperature of austenitic alloys, which are then used to calculate the SFE and explain deformation mechanisms. However, these empirical equations, typically derived using linear regression algorithms, are often simplistic and may fail to capture the complex interactions among multiple alloying elements that influence the Néel temperature. Moreover, their applicability is usually limited to specific compositional ranges. In this study, we propose a CALPHAD based approach and develop a surrogate decision tree based regression model capable of capturing the interactions among multiple alloying elements to predict the Néel temperature. Predictions from both the CALPHAD approach and the regression model show close agreement with experimental measurements reported in the literature. The implications of accurate Néel temperature predictions on the calculated SFE and deformation mechanisms are also discussed.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116773"},"PeriodicalIF":5.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107211","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

Quartet structure generation set algorithm based 3D reconstruction on porous structures of sintered copper joints for power electronics packaging 基于四重奏结构生成集算法的电力电子封装烧结铜接头多孔结构三维重构

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-19 DOI: 10.1016/j.scriptamat.2025.116750

Wenting Liu , Xinyue Wang , Jing Zhang , Guoqi Zhang , Chuantong Chen , Pan Liu

{"title":"Quartet structure generation set algorithm based 3D reconstruction on porous structures of sintered copper joints for power electronics packaging","authors":"Wenting Liu , Xinyue Wang , Jing Zhang , Guoqi Zhang , Chuantong Chen , Pan Liu","doi":"10.1016/j.scriptamat.2025.116750","DOIUrl":"10.1016/j.scriptamat.2025.116750","url":null,"abstract":"<div><div>Sintered materials have been widely applied, as an alternative to soldering, for power electronics packaging. One key issue for such die-attach material is to characterize the actual porosity, which is difficult to obtain through SEM cross-section analysis. Therefore, in this work, the optimized Quartet Structure Generation Set (QSGS) algorithm was applied to sintered copper joints under various porosity levels to reconstruct 3D porous structures based on 2D SEM images. Firstly, copper joints with varying porosities were fabricated under different sintering conditions. Reconstructed 3D porous copper models were then generated through the QSGS algorithm to match experimental observations, including porosity and pore size. Finite element analysis (FEA) simulations were further conducted to explore the effects of pores on thermal and electrical performance. This work provides a method for accurately predicting the thermoelectric properties of sintered copper joints and insights for optimizing copper sintering in power electronics applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"265 ","pages":"Article 116750"},"PeriodicalIF":5.3,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089348","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

Enhanced elastocaloric effect in Sc-doped TiNi shape memory alloys 掺sc的TiNi形状记忆合金的弹性热效应增强

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-17 DOI: 10.1016/j.scriptamat.2025.116765

Shuangshuang Zhao , Le Zhang , Qianglong Liang , Chuanxin Liang , Lu Wang , Xiangwen He , Dong Wang

{"title":"Enhanced elastocaloric effect in Sc-doped TiNi shape memory alloys","authors":"Shuangshuang Zhao , Le Zhang , Qianglong Liang , Chuanxin Liang , Lu Wang , Xiangwen He , Dong Wang","doi":"10.1016/j.scriptamat.2025.116765","DOIUrl":"10.1016/j.scriptamat.2025.116765","url":null,"abstract":"<div><div>We report a giant elastocaloric effect in <em>Sc</em>-doped TiNi shape memory alloys, demonstrating their potential for solid-state cooling applications. The solution-treated (Ti<sub>49.2</sub>Ni<sub>50.8</sub>)<sub>99.8</sub>Sc<sub>0.2</sub> alloy achieves a high entropy change of ∼74 J/kg·K and a adiabatic temperature change (∆<em>T</em><sub>ad</sub>) of 37.41 K, though it suffers from poor thermal cycling stability. However, after ageing at 623 K for 10 hours, the alloy retains a high ∆<em>T</em><sub>ad</sub> of −31.56 K with coefficient of performance (<em>COP</em><sub>materials</sub>) of 21. Furthermore, it demonstrates a stable ∆<em>T</em><sub>ad</sub> of −15.05 K and a high <em>COP</em><sub>materials</sub> of 32 under reduced stress after 100 loading cycles. Microstructural analysis reveals that the two-step B2-R-B19′ martensitic transformation, combined with the formation of Ni<sub>4</sub>Ti<sub>3</sub> precipitates and Sc<sub>2</sub>O<sub>3</sub>/ScO particles, strengthens the matrix and enhances the cycling stability of the elastocaloric effect. This study demonstrates a pathway to achieve a giant elastocaloric effect in <em>Sc</em>-doped TiNi alloys, underscoring their promise for practical solid-state cooling technologies.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"265 ","pages":"Article 116765"},"PeriodicalIF":5.3,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070932","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

PCS: Property-composition-structure chain in Mg-Nd alloys through integrating sigmoid fitting and conditional generative adversarial network modeling 通过整合sigmoid拟合和条件生成对抗网络模型的Mg-Nd合金的属性-成分-结构链

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-17 DOI: 10.1016/j.scriptamat.2025.116762

Xu Qin , Qinghang Wang , Xinqian Zhao , Shouxin Xia , Li Wang , Yuhui Zhang , Chao He , Daolun Chen , Bin Jiang

{"title":"PCS: Property-composition-structure chain in Mg-Nd alloys through integrating sigmoid fitting and conditional generative adversarial network modeling","authors":"Xu Qin , Qinghang Wang , Xinqian Zhao , Shouxin Xia , Li Wang , Yuhui Zhang , Chao He , Daolun Chen , Bin Jiang","doi":"10.1016/j.scriptamat.2025.116762","DOIUrl":"10.1016/j.scriptamat.2025.116762","url":null,"abstract":"<div><div>Here, we report a unified framework to establish the property-composition-structure (P-C-S) relationship, utilizing a property-oriented generative model that incorporates composition as a continuous conditional label within a conditional generative adversarial network (CGAN). This approach enables arbitrary microstructure prediction across a specified composition range. Using as-cast Mg-Nd alloys as a case study, the model synergistically integrates sigmoid fitting and CGAN modeling. Sigmoid fitting effectively bridges the relationship between alloy hardness and composition, while CGAN generates microstructures corresponding to specified compositions. The phase fraction of the alloys serves as a metric for assessing the similarity and accuracy of the generated microstructures. By elucidating the intricate interdependence between property, composition, and structure, this framework offers a scalable and systematic approach to property-driven material design. Beyond enhancing our understanding of the fundamental mechanisms governing material properties, it provides a powerful computational tool for tailoring material properties for specific applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"265 ","pages":"Article 116762"},"PeriodicalIF":5.3,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070933","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 applied stress on radiation-induced loop and raft formation in molybdenum 外加应力对钼中辐射诱发环和筏形形成的影响

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-16 DOI: 10.1016/j.scriptamat.2025.116757

H.T. Vo , M.M. Schneider , W.Y. Chen , A.A. Kohnert

引用次数: 0

Solute clustering behaviour during natural ageing in Al-Cu alloys containing Sc and Zr 含Sc和Zr的Al-Cu合金自然时效过程中的溶质聚类行为

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-16 DOI: 10.1016/j.scriptamat.2025.116764

Lu Jiang , Kathleen Wood , Anna Sokolova , Thomas Dorin

{"title":"Solute clustering behaviour during natural ageing in Al-Cu alloys containing Sc and Zr","authors":"Lu Jiang , Kathleen Wood , Anna Sokolova , Thomas Dorin","doi":"10.1016/j.scriptamat.2025.116764","DOIUrl":"10.1016/j.scriptamat.2025.116764","url":null,"abstract":"<div><div>This study investigates the effects of scandium (Sc) and zirconium (Zr) microalloying on solute clustering in Al-Cu alloys during natural ageing. Using atom probe tomography (APT), we reveal a full suppression of Cu-rich cluster formation in the AlCuScZr alloy compared to its Sc- and Zr-free counterpart. Instead, a distinct type of cluster, comprising Si, Sc and Zr forms, preferentially at Al<sub>3</sub>(Sc, Zr) dispersoids/Al interfaces, driven by strong Si-Sc-vacancy and Si-Zr-vacancy binding energies. These sites act as vacancy traps, redirecting clustering pathways away from the Cu-rich clusters typically observed in Al-Cu alloys. Small-angle x-ray scattering (SAXS) indicates suggest that the natural ageing kinetics in the AlCuScZr alloys are significantly delayed, likely due to the limited availability of Si, Sc and Zr solutes in the matrix. As a result, the AlCuScZr alloy exhibits slower hardening response during natural ageing. This is the first report of Si-Sc-Zr cluster formation during natural ageing in Al alloys, providing critical insights into how dispersoids, solute interactions, and vacancies govern early-stage clustering and mechanical evolution.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"265 ","pages":"Article 116764"},"PeriodicalIF":5.3,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068017","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