Amorphous Thickness-Dependent Strengthening-Softening Transition in Crystalline-Amorphous Nanocomposites

doi:10.1021/acs.nanolett.3c03848

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	Amorphous Thickness-Dependent Strengthening-Softening Transition in Crystalline-Amorphous Nanocomposites
	Qian, Lei; Yang, Wenqing; Luo, Jiasi; Wang YJ(王云江); Chan, K C; Yang, XuSheng
刊名	NANO LETTERS
	2023-11-20
卷号	23 期号:23 页码:11288-11296
关键词	crystalline-amorphous nanocomposite Cu-CuTa atomistic simulations codeformationcooperative mechanisms
ISSN号	1530-6984
DOI	10.1021/acs.nanolett.3c03848
通讯作者	Yang, Xu-Sheng(xsyang@polyu.edu.hk)
英文摘要	Core-shell crystalline-amorphous nanocomposites, featuring nanograins surrounded by thick amorphous boundaries, are promising nanoarchitectures for achieving exceptional strength through cooperative strengthening effects. However, a comprehensive understanding of the influence of characteristic sizes, particularly the amorphous thickness, on codeformation strengthening is still lacking, limiting the attainment of the strength limit. Here, we employ molecular dynamics simulations to investigate Cu-CuTa crystalline-amorphous nanocomposites with varying grain sizes and amorphous thicknesses. Our findings demonstrate significant strengthening effects in nanocomposites, effectively suppressing the Hall-Petch breakdown observed in traditional amorphous-free nanograined Cu. Intriguingly, we observe a maximum strength followed by a strengthening-softening transition dependent on the amorphous thickness, as exemplified by a representative nanocomposite featuring a 12.5 nm grain size and a critical amorphous thickness of 4 nm. Inspired by observed shifts in atomistic mechanisms, we developed a theoretical model encompassing variations in grain size and amorphous thickness, providing valuable insights into the size-strength relationship for crystalline-amorphous nanocomposites.
分类号	一类
资助项目	Hong Kong Polytechnic University[15210123] ; Hong Kong Research Grants Council[1-CD4K] ; PolyU grant[51971187] ; National Natural Science Foundation of China ; Research Committee of PolyU
WOS关键词	MECHANICAL-BEHAVIOR ; DEFORMATION MECHANISMS ; SIZE ; DUCTILITY ; FILMS
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
WOS记录号	WOS:001142880300001
资助机构	Hong Kong Polytechnic University ; Hong Kong Research Grants Council ; PolyU grant ; National Natural Science Foundation of China ; Research Committee of PolyU
其他责任者	Yang, Xu-Sheng
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/94079]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Qian, Lei,Yang, Wenqing,Luo, Jiasi,et al. Amorphous Thickness-Dependent Strengthening-Softening Transition in Crystalline-Amorphous Nanocomposites[J]. NANO LETTERS,2023,23(23):11288-11296.
APA	Qian, Lei,Yang, Wenqing,Luo, Jiasi,王云江,Chan, K C,&Yang, XuSheng.(2023).Amorphous Thickness-Dependent Strengthening-Softening Transition in Crystalline-Amorphous Nanocomposites.NANO LETTERS,23(23),11288-11296.
MLA	Qian, Lei,et al."Amorphous Thickness-Dependent Strengthening-Softening Transition in Crystalline-Amorphous Nanocomposites".NANO LETTERS 23.23(2023):11288-11296.