Characterization of gradient plastic deformation in gradient nanotwinned Cu

doi:10.1016/j.actamat.2023.118673

IMR OpenIR

	Characterization of gradient plastic deformation in gradient nanotwinned Cu
	Cheng, Zhao 1; Bu, Linfeng 1,2; Zhang, Yin 3; Wu, HengAn 2; Zhu, Ting 3; Lu, Lei 1
通讯作者	Zhu, Ting(ting.zhu@me.gatech.edu) ; Lu, Lei(llu@imr.ac.cn)
	2023-03-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	246 页码:11
摘要	Gradient nanostructured (GNS) metals exhibit high overall extra strengths relative to their non-gradient coun-terparts. However, the spatial distribution of local extra strengths stemming from plastic strain gradients remains elusive. This work is focused on characterizing the gradient distribution of plastic strains in a representative GNS metal of gradient nanotwinned (GNT) Cu. Full-field strain mapping reveals the gradient distributions of lateral strains in the transverse cross section of GNT Cu samples undergoing uniaxial tensile deformation. We find that the lateral strain gradient increases but the maximum lateral strain difference decreases in GNT samples with increasing structural gradient. The latter arises because the softest layer with the lowest initial yield strength gains the largest local extra strength during tensile deformation, and vice versa. Such a gradient distribution of local extra strengths results from the combined strengthening effects of plastic strain gradient and grain size. These experimental results are used to inform a strain gradient plasticity model for revealing the gradient dis-tributions of local extra back stresses and local extra strengths with increasing load. The coupled experimental and modeling characterization of gradient plastic deformation provides an in-depth mechanistic understanding of the spatial-temporal evolution of gradient strengthening effects in gradient nanostructures.
关键词	Gradient nanotwinned cu Structural gradient Distributions of gradient plastic strains Bundle of concentrated dislocations Back stress
资助者	National Natural Science Foundation of China (NSFC) ; Key Research Program of Frontier Science and International Partnership Program ( ; China Postdoctoral Science Foundation ; IMR Innovation Fund
DOI	10.1016/j.actamat.2023.118673
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[51931010] ; National Natural Science Foundation of China (NSFC)[92163202] ; Key Research Program of Frontier Science and International Partnership Program ( ; China Postdoctoral Science Foundation ; IMR Innovation Fund ; [52001312] ; [GJHZ2029] ; [BX20190336] ; [2019M661150] ; [2021-PY02]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000919660000001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/175240
专题	中国科学院金属研究所
通讯作者	Zhu, Ting; Lu, Lei
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, CAS Ctr Excellence Complex Syst Mech, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Peoples R China 3.Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA
推荐引用方式 GB/T 7714	Cheng, Zhao,Bu, Linfeng,Zhang, Yin,et al. Characterization of gradient plastic deformation in gradient nanotwinned Cu[J]. ACTA MATERIALIA,2023,246:11.
APA	Cheng, Zhao,Bu, Linfeng,Zhang, Yin,Wu, HengAn,Zhu, Ting,&Lu, Lei.(2023).Characterization of gradient plastic deformation in gradient nanotwinned Cu.ACTA MATERIALIA,246,11.
MLA	Cheng, Zhao,et al."Characterization of gradient plastic deformation in gradient nanotwinned Cu".ACTA MATERIALIA 246(2023):11.