Effect of volume fractions of gradient transition layer on mechanical behaviors of nanotwinned Cu

doi:10.1016/j.actamat.2022.118456

IMR OpenIR

	Effect of volume fractions of gradient transition layer on mechanical behaviors of nanotwinned Cu
	Cheng, Zhao 1; Wan, Tao 1,2; Bu, Linfeng 1,3; Lu, Lei 1
通讯作者	Lu, Lei(llu@imr.ac.cn)
	2023
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	242 页码:12
摘要	Heterogeneous nanostructured (HNS) materials, such as gradient and laminated nanostructured metals, possess superior mechanical properties with respect to their homogeneous counterparts. The additional strengthening mechanism of HNS is mainly attributed to the non-uniform plastic deformation induced by gradient transition layers (GTLs) between components. Here, we designed three gradient nanotwinned (GNT) Cu samples with different volume fractions of GTLs ( f g ) of 10%, 50% and 100% while the rule-ofmixture strength and overall structural gradient are constant to quantitatively reveal its effect on the extra strengthening behaviors. As f g increases, the yield strength is improved and the elastic to plastic stage is prolonged at small strain. Moreover, larger f g suppresses the strain localization and reduces nucleation of cracks at larger strain, accompanied by more widely distributed geometrically necessary dislocations (GNDs) and more bundles of concentrated dislocations (BCDs), thus improving the elongation. Stress partitioning analysis and numerical simulations show that the more widely-distributed GNDs at larger f g result in higher overall back stresses but hardly affect effective stresses, indicative of the origin of the improved strengthening. Such GND-distribution dominated strengthening mechanism paves a fundamental way for developing higher-performance HNS materials.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Heterogeneous nanostructured metals Gradient transition layer Strengthening behavior Distribution of GNDs 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.2022.118456
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] ; National Natural Science Foundation of China (NSFC)[52001312] ; Key Research Program of Frontier Science and International partnership program[GJHZ2029] ; China Postdoctoral Science Foundation[BX20190336] ; China Postdoctoral Science Foundation[2019M661150] ; IMR Innovation Fund[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:000899578000004
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：42[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/321006/175558
专题	中国科学院金属研究所
通讯作者	Lu, Lei
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.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
推荐引用方式 GB/T 7714	Cheng, Zhao,Wan, Tao,Bu, Linfeng,et al. Effect of volume fractions of gradient transition layer on mechanical behaviors of nanotwinned Cu[J]. ACTA MATERIALIA,2023,242:12.
APA	Cheng, Zhao,Wan, Tao,Bu, Linfeng,&Lu, Lei.(2023).Effect of volume fractions of gradient transition layer on mechanical behaviors of nanotwinned Cu.ACTA MATERIALIA,242,12.
MLA	Cheng, Zhao,et al."Effect of volume fractions of gradient transition layer on mechanical behaviors of nanotwinned Cu".ACTA MATERIALIA 242(2023):12.