Thickness effect on fracture behavior of columnar-grained Cu with preferentially oriented nanoscale twins

doi:10.1557/jmr.2017.309

IMR OpenIR

	Thickness effect on fracture behavior of columnar-grained Cu with preferentially oriented nanoscale twins
	Luo, Shusen 1,2; You, Zesheng 3; Lu, Lei 1
通讯作者	Lu, Lei(llu@imr.ac.cn)
	2017-12-28
发表期刊	JOURNAL OF MATERIALS RESEARCH
ISSN	0884-2914
卷号	32 期号:24 页码:4554-4562
摘要	The effect of specimen thickness on fracture toughness and fracture mechanism was investigated in bulk columnar-grained Cu with preferentially oriented nanoscale growth twins. Below a critical specimen thickness of similar to 1.0 mm, plane stress state prevailed ahead of the crack tip and the fracture initiation toughness J(C) decreased with decreasing thickness. Above the critical thickness, J(C) decreased with increasing thickness until approaching an intrinsic thickness-independent value when the crack front was mainly under plane strain condition. Under plane strain condition, threading dislocations were majorly activated to glide along the nanotwin channels and to produce severe stress concentrations when they piled-up against grain boundaries (GBs). As a result, intergranular cracking mediated the failure of the nanotwinned Cu. On the contrary, under plane stress condition, dislocations slipping-transfer across twin boundaries (TBs) or partial dislocations gliding at TBs were activated to accommodate the plastic deformation. Consequently, stress intensification at GBs was plastically relaxed through enhanced detwinning and shear banding, which suppressed the intergranular fracture and promoted transgranular shear fracture.
关键词	fracture nanostructure toughness
资助者	National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China
DOI	10.1557/jmr.2017.309
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51420105001] ; National Natural Science Foundation of China[51371171] ; National Natural Science Foundation of China[51471172] ; National Natural Science Foundation of China[51401211] ; National Natural Science Foundation of China[U1608257] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences ; Natural Science Foundation of Jiangsu Province, China[BK20161498]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000419001500011
出版者	CAMBRIDGE UNIV PRESS
引用统计	被引频次：10[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/321006/80440
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, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Luo, Shusen,You, Zesheng,Lu, Lei. Thickness effect on fracture behavior of columnar-grained Cu with preferentially oriented nanoscale twins[J]. JOURNAL OF MATERIALS RESEARCH,2017,32(24):4554-4562.
APA	Luo, Shusen,You, Zesheng,&Lu, Lei.(2017).Thickness effect on fracture behavior of columnar-grained Cu with preferentially oriented nanoscale twins.JOURNAL OF MATERIALS RESEARCH,32(24),4554-4562.
MLA	Luo, Shusen,et al."Thickness effect on fracture behavior of columnar-grained Cu with preferentially oriented nanoscale twins".JOURNAL OF MATERIALS RESEARCH 32.24(2017):4554-4562.