More severe surface relief but stronger fatigue resistance at small scales: Vacancy-assisted fatigue damage mechanism

doi:10.1016/j.actamat.2024.120028

IMR OpenIR

	More severe surface relief but stronger fatigue resistance at small scales: Vacancy-assisted fatigue damage mechanism
	Chen, Honglei 1; Luo, Xuemei 1; Zhang, Mingyuan 1,2; Wen, Ming 3; Zhu, Xiaofei 1; Zhang, Guangping 1
通讯作者	Luo, Xuemei(xmluo@imr.ac.cn) ; Zhang, Guangping(gpzhang@imr.ac.cn)
	2024-08-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	274 页码:15
摘要	Surface relief in forms of extrusions and intrusions as the substantial feature of early fatigue damage is one of the most important phenomena studied in metal fatigue. The most common surface relief models in bulk metals are agreed to be correlated with the formation of typical dislocation patterns as persistent slip bands (PSBs), while little is known about the fundamental mechanisms at submicron and even nanometer scales where dislocation pattern formation is fully inhibited. Here, as exampled with thin Au films, the underlying fatigue damage mechanism at small scales is investigated through the quantitative characterization of fatigue damages. Continuous generation and migration of vacancies is found to be crucial for the shape of extrusion/intrusions and kinetics of their growth at submicron and even nanometer scales. Due to the degraded dislocation interaction and intensified vacancy diffusion, the delayed vacancy accumulation in the small-scale metal interior suppresses the extrusion and interface void formation in thinner films, which finally leads to the superior ability to support tremendous surface relief and strong fatigue resistance. The finding of the vacancy-dominated fatigue mechanism at small scales extends our understanding of the metal fatigue mechanisms down to the submicron and even nanometer scales and suggests a novel interface engineering strategy by vacancy behavior modulation for fatigue-tolerance material design.
关键词	Extrusion Fatigue Vacancies Damage mechanism Nanocrystal
资助者	National Natural Science Foundation of China (NSFC) ; Yunnan Province Expert Workstation Project ; Strategic Priority Research Program of Chinese Academy of Sciences ; Foundation for Outstanding Young Scholar - Institute of Metal Research (IMR)
DOI	10.1016/j.actamat.2024.120028
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[52071319] ; Yunnan Province Expert Workstation Project[202305AF150171] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB0510303] ; Foundation for Outstanding Young Scholar - Institute of Metal Research (IMR)
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001265950800001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：1[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/321006/188017
专题	中国科学院金属研究所
通讯作者	Luo, Xuemei; Zhang, Guangping
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Sino Platinum Met Co Ltd, 988 Keji Rd,High Tech Dev Zone, Kunming 650106, Peoples R China
推荐引用方式 GB/T 7714	Chen, Honglei,Luo, Xuemei,Zhang, Mingyuan,et al. More severe surface relief but stronger fatigue resistance at small scales: Vacancy-assisted fatigue damage mechanism[J]. ACTA MATERIALIA,2024,274:15.
APA	Chen, Honglei,Luo, Xuemei,Zhang, Mingyuan,Wen, Ming,Zhu, Xiaofei,&Zhang, Guangping.(2024).More severe surface relief but stronger fatigue resistance at small scales: Vacancy-assisted fatigue damage mechanism.ACTA MATERIALIA,274,15.
MLA	Chen, Honglei,et al."More severe surface relief but stronger fatigue resistance at small scales: Vacancy-assisted fatigue damage mechanism".ACTA MATERIALIA 274(2024):15.