Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature

doi:10.3389/fmats.2022.1118952

IMECH-IR > 非线性力学国家重点实验室

	Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature
	Tao, Yuhao; Cheng WQ(程文强); Wang W(王为)
通讯作者	Wang, Wei(wangwei2@imech.ac.cn)
发表期刊	FRONTIERS IN MATERIALS
	2023-01-06
卷号	9 页码:8
ISSN	2296-8016
摘要	Large-scale molecular dynamics (MD) simulations have been utilized to reveal the atomistic deformation mechanisms of a CrCoNi medium-entropy alloy (MEA) with gradient nano-grained (GNG) structure in the present study. Strong strain hardening was observed in the gradient nano-grained structure at the elasto-plastic transition stage, which could be attributed to the Masing hardening. After yielding, obvious partitioning of tensile strain was detected in the gradient nano-grained structure, which indicates the existence of hetero-deformation induced (HDI) hardening effect and could account for the higher flow stress of the gradient nano-grained structure than that calculated by the rule of mixture from its homogenous nano-grained (NG) structured counterparts. Moreover, partitioning of stacking fault factor (corresponding to the partitioning of tensile strain), which demonstrates the intensity of dislocation behaviors, was also observed in the gradient nano-grained structure. The differences of factors for each grain size area were found to be smaller in the gradient nano-grained structure than those of its homogeneous nano-grained structured counterparts, which indicates the influence of forward stress and back stress on dislocation motion near the zone boundary between the hard zone with smaller grains and the soft zone with larger grains, further verifying the presence of hetero-deformation induced hardening in the gradient nano-grained structure.
关键词	molecular dynamics gradient nano-grained cryogenic temperature hetero-deformation induced hardening stacking fault factor
DOI	10.3389/fmats.2022.1118952
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000918191600001
关键词[WOS]	SEVERE PLASTIC-DEFORMATION ; EQUIATOMIC CRCONI ; HIGH-STRENGTH ; STRAIN ; DUCTILITY ; STRESS ; MARTENSITE ; NI ; BEHAVIORS ; MAXIMUM
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
资助项目	NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics[11988102] ; National Natural Science Foundation of China[52192591]
项目资助者	NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics ; National Natural Science Foundation of China
论文分区	二类
力学所作者排名	1
RpAuthor	Wang, Wei
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/91550
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Tao, Yuhao,Cheng WQ,Wang W. Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature[J]. FRONTIERS IN MATERIALS,2023,9:8.
APA	Tao, Yuhao,程文强,&王为.(2023).Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature.FRONTIERS IN MATERIALS,9,8.
MLA	Tao, Yuhao,et al."Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature".FRONTIERS IN MATERIALS 9(2023):8.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Jp2023A085.pdf（3844KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览下载