The toughening effect of twins on fracture in nanotwinned Cu during cyclic loading

doi:10.1016/j.actamat.2024.120232

IMR OpenIR

	The toughening effect of twins on fracture in nanotwinned Cu during cyclic loading
	He, S. Y.1; Jiang, B. B.1; Lu, N.1; Chen, C. J.1; Cui, J. P.1; Huang, Z. Y.1; Jin, S.1; Ye, H. Q.1,2; Lu, L.1; Du, K.1
通讯作者	Jiang, B. B.(bbjiang12s@imr.ac.cn) ; Du, K.(kuidu@imr.ac.cn)
	2024-10-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	278 页码:15
摘要	Extensive studies have been focused on improving the fatigue performance of materials, as fatigue fracture is a primary mode of failure in material applications for structural components. The introduction of high-density twins emerges as a novel strategy for enhancing fracture toughness; however, the mechanisms driving this enhancement during fatigue remain elusive. In this work, the impact of twins on fracture toughness in nanotwinned Cu was investigated with correlated transmission electron microscopy under cyclic loading. The results revealed three toughening mechanisms, i.e., bridging, bending of twin lamellae and ductile cracking along twin boundaries. The occurrence of the three toughening mechanisms strongly depends on twin thickness and cracking orientations, as different dislocation modes are activated in varying scenarios. Specifically, bridging and ductile cracking along twin boundaries are facilitated by the pile-up and continuous emission of hard mode I dislocations, respectively, while the bending of twin lamellae is governed by the accumulation of same-signed soft mode dislocations triggered by crack-tip stress. These findings unveil the underlying toughening mechanisms of twins in nanotwinned metals during cyclic loading and offer valuable guidance for the design of hightoughness nanolayered materials.
关键词	Transmission electron microscopy Microstructure Nanotwins Toughness Fatigue crack
资助者	Key Research Program of Frontier Sciences of Chinese Academy of Sciences ; Na-tional Natural Science Foundation of China ; Guangxi Key Research and Development Plan ; Natural Science Foundation of Liaoning Province
DOI	10.1016/j.actamat.2024.120232
收录类别	SCI
语种	英语
资助项目	Key Research Program of Frontier Sciences of Chinese Academy of Sciences[QYZDJ-SSW-JSC024] ; Na-tional Natural Science Foundation of China[91960202] ; Na-tional Natural Science Foundation of China[52171020] ; Na-tional Natural Science Foundation of China[51901229] ; Guangxi Key Research and Development Plan[AA23023030] ; Natural Science Foundation of Liaoning Province[2024-MSBA-69]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001294266700001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：3[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/321006/189020
专题	中国科学院金属研究所
通讯作者	Jiang, B. B.; Du, K.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Ji Hua Lab, Foshan 528200, Peoples R China
推荐引用方式 GB/T 7714	He, S. Y.,Jiang, B. B.,Lu, N.,et al. The toughening effect of twins on fracture in nanotwinned Cu during cyclic loading[J]. ACTA MATERIALIA,2024,278:15.
APA	He, S. Y..,Jiang, B. B..,Lu, N..,Chen, C. J..,Cui, J. P..,...&Du, K..(2024).The toughening effect of twins on fracture in nanotwinned Cu during cyclic loading.ACTA MATERIALIA,278,15.
MLA	He, S. Y.,et al."The toughening effect of twins on fracture in nanotwinned Cu during cyclic loading".ACTA MATERIALIA 278(2024):15.