Enhanced fatigue endurance limit of Cu through low-angle dislocation boundary

doi:10.1016/j.actamat.2022.118542

IMR OpenIR

	Enhanced fatigue endurance limit of Cu through low-angle dislocation boundary
	Pan, Qingsong; Jing, Lijun; Lu, Lei
通讯作者	Lu, Lei(llu@imr.ac.cn)
	2023
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	244 页码:10
摘要	How to remarkably elevate the high-cycle fatigue resistance of metallic materials under cyclic loading is a crucial, yet technically challenging issue for major structural applications. Either traditional strengthening ap-proaches or newly-developed hierarchical nanostructural modifications has been demonstrated to usually display a limited ability of enhancing the 107-cycle fatigue endurance limit. Here, we introduce massive nano-scaled low-angle dislocation boundaries in coarse grained pure Cu by means of simple drawing process, not only enhancing the tensile strength obviously, but also imparting a fatigue limit as high as 130 MPa and a fatigue ratio of 0.35, which is a record for pure Cu. Upon cyclic loading, the extensive activation of strongly confined dislocation slip within homogeneous dislocation cells (with cell size of about 300 nm) effectively mediates cyclic plastic strain with slightly cyclic softening. The elevated stress resistance of DC Cu to cyclic loading is primarily attributed to the high density of built-in low-angle dislocation cells, which are strong and also suppress local surface roughening and crack initiation, thereby contributing to an enhanced fatigue life.
关键词	Low-angle dislocation boundary Fatigue limit Cyclic deformation Surface roughening Cu
资助者	National Science Foundation of China (NSFC) ; Key Research Program of Frontier Science and International Partnership Program ; IMR Innovation Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences
DOI	10.1016/j.actamat.2022.118542
收录类别	SCI
语种	英语
资助项目	National Science Foundation of China (NSFC)[51931010] ; National Science Foundation of China (NSFC)[92163202] ; National Science Foundation of China (NSFC)[52122104] ; National Science Foundation of China (NSFC)[52071321] ; Key Research Program of Frontier Science and International Partnership Program[GJHZ2029] ; IMR Innovation Fund[2022-ZD02] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2019196]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000982515400001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：20[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/321006/177579
专题	中国科学院金属研究所
通讯作者	Lu, Lei
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Pan, Qingsong,Jing, Lijun,Lu, Lei. Enhanced fatigue endurance limit of Cu through low-angle dislocation boundary[J]. ACTA MATERIALIA,2023,244:10.
APA	Pan, Qingsong,Jing, Lijun,&Lu, Lei.(2023).Enhanced fatigue endurance limit of Cu through low-angle dislocation boundary.ACTA MATERIALIA,244,10.
MLA	Pan, Qingsong,et al."Enhanced fatigue endurance limit of Cu through low-angle dislocation boundary".ACTA MATERIALIA 244(2023):10.