Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy

被引：12
作者：
Cao, Fuhua [1 ,2 ]
Chen, Yan [1 ,2 ]
Wang, Hai-Ying [1 ,2 ]
Dai, Lan-Hong [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
[3] Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 153卷
基金：
中国国家自然科学基金;
关键词：
Fracture; Chemical inhomogeneity; Grain boundary; Medium entropy alloy; INTERGRANULAR FRACTURE; MOLECULAR-DYNAMICS; CRACK-TIP; EMBRITTLEMENT; DEFORMATION; PLASTICITY; ALUMINUM; COMPLEXIONS; MECHANISMS; SIMULATION;
D O I：
10.1016/j.jmst.2023.02.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Grain boundary (GB) fracture is arguably one of the most important reasons for the catastrophic failure of ductile polycrystalline materials. It is of interest to explore the role of chemical distribution on GB defor-mation and fracture, as GB segregation becomes a key strategy for tailoring GB properties. Here we report that the inhomogeneous chemical distribution effectively inhibits GB fracture in a model CoCrNi medium entropy alloy compared to a so-called 'average-atom' sample. Atomic deformation kinematics combined with electronic behavior analysis reveals that the strong charge redistribution ability in chemical disor-dered CrCoNi GBs enhances shear deformation and thus prevents GB crack formation and propagation. Inspects on the GBs with different chemical components and chemical distributions suggest that not only disordered chemical distribution but also sufficient "harmonic elements" with large electronic flexibility contribute to improving the GB fracture resistance. This study provides new insight into the influence mechanism of GB chemistry on fracture behavior, and yields a systematic strategy and criterion, from the atoms and electrons level, forward in the design of high-performance materials with enhanced GB fracture resistance.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：228 / 241
页数：14
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