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The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys
Liu SY(刘尚宇); Wei YJ(魏宇杰)
发表期刊Extreme Mechanics Letters
2017-02
卷号11页码:84-88
ISSN2352-4316
摘要

It has been shown that heterogeneity at the micro-structure level can effectively enhance the strength and ductility of materials. Here we demonstrate via density-functional theory calculations that high entropy alloys (HEAs) exhibit atomic level heterogeneity in bond length and stacking fault energy (SFE) which could lead to HEAs’ excellent hardenability and deformability. The bond length of HEA FeCoNiCrCu follows a Gaussian distribution, in contrast to the single-valued SFE and bond length in conventional crystalline counterparts. Its SFEs also fall into a wide span, which could introduce sequential and dispersed nucleation of different plastic sources including phase transformation, deformation twinning, and dislocations, giving rise to their exceptionally high hardenability and ductility. The atomic level heterogeneity in HEAs further gives rise to solid solution strengthening during dislocation motion. The concept of making atomic level heterogeneity can also be utilized in other metallic alloys for better hardenability and ductility.

DOI10.1016/j.eml.2016.10.007
收录类别SCI ; EI
语种英语
WOS记录号WOS:000401153700012
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/72150
专题非线性力学国家重点实验室
通讯作者Wei YJ(魏宇杰)
推荐引用方式
GB/T 7714
Liu SY,Wei YJ. The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys[J]. Extreme Mechanics Letters,2017,11:84-88.
APA Liu SY,&Wei YJ.(2017).The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys.Extreme Mechanics Letters,11,84-88.
MLA Liu SY,et al."The Gaussian distribution of lattice size and atomic level heterogeneity in high entropy alloys".Extreme Mechanics Letters 11(2017):84-88.
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