Phase transformation induced by severe gradient shear deformation in an Al0.1CoCrFeNi alloy

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-25 DOI:10.1016/j.matchar.2025.115074

Wanyi Yang , Hui Sheng , Zhaowen Geng , Yuhang Shi , Pengda Niu , Ruidi Li , Xiaolong Ma , Yanxia Liu , Gang Zhou , Kechao Zhou , Miao Song

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Abstract

High-entropy alloys (HEAs) are emerging as promising wear-resistant materials for engineering applications, owing to their exceptional mechanical properties and wear resistance. Nevertheless, the atomic friction and wear mechanisms of HEAs remains poorly understood, limiting the establishment of a comprehensive microstructure evolution framework that spans multiple length scales. Here, in-situ TEM was employed to investigate atomic scale friction and wear mechanisms of an Al_0.1CoCrFeNi alloy. The results reveal that the phase transformation from [011]_FCC to [001]_FCC, induced by the frictional gradient shear deformation, is correlated with significant strain relaxation at the intersections of stacking faults near the scratch surface. Additionally, numerous intermediate phases, resulting from lattice contraction and expansion due to atomic slip within the {111} planes, are observed in the friction subsurface. These findings enhance fundamental understanding of atomic-scale friction mechanisms in HEAs and provide valuable insights into the underlying damage mechanisms of wear-resistant materials subjected to friction-induced shear deformation.

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Al0.1CoCrFeNi合金剧烈梯度剪切变形引起的相变

高熵合金（HEAs）由于其优异的机械性能和耐磨性，正在成为工程应用中有前途的耐磨材料。然而，HEAs的原子摩擦和磨损机制仍然知之甚少，限制了跨多个长度尺度的综合微观结构演变框架的建立。采用原位透射电镜研究了Al0.1CoCrFeNi合金的原子尺度摩擦磨损机理。结果表明：由摩擦梯度剪切变形引起的[011]FCC向[001]FCC相变与靠近划痕表面的层错交叉处显著的应变松弛有关；此外，在摩擦亚表面观察到许多中间相，这些中间相是由{111}平面内原子滑移引起的晶格收缩和膨胀引起的。这些发现增强了对HEAs中原子尺度摩擦机制的基本理解，并为摩擦诱导剪切变形下耐磨材料的潜在损伤机制提供了有价值的见解。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.