Dislocation structures in fatigued critical and conjugate double-slip-oriented copper single crystals

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	Dislocation structures in fatigued critical and conjugate double-slip-oriented copper single crystals
	X. W. Li; Y. Umakoshi; B. Gong; S. X. Li; Z. G. Wang
	2002
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	333 期号:1-2 页码:51-59
摘要	The dislocation structures induced by cyclic deformation of [017] critical and, [(1) over bar 12], [(1) over bar 17] conjugate double-slip-oriented Cu single crystals were investigated using transmission electron microscopy (TEM) and electron channeling contrast (ECC) technique in scanning electron microscopy (SEM). It was found that the crystallographic orientation has a notable effect on the dislocation structures in cyclically saturated critical and (or) conjugate double-slip-oriented Cu single crystals. Such an orientation dependence of dislocation structure can account well for the corresponding orientation dependence of the plateau behavior in the cyclic stress-strain (CSS) curve. In cyclic deformation of the [(1) over bar 12] crystal, the formation of persistent slip band (PSB) ladder structures is a general phenomenon; PSBs occur even under the low strain amplitude, which is below the plateau region in the CSS curve. The experimental result above indicates that there is not a complete one-to-one correlation between the formation of PSBs and the presence of a plateau region of the CSS curve. In certain double-slip oriented Cu single crystals investigated here, the actual size of microstructures is in fact, found to be changeable with varying strain amplitude, which is one of the main reasons for the disappearance of a clear plateau in the CSS curve of these crystals. For example, the decrease in the width of vein channels with increasing strain amplitude and the absence of PSB ladder structure are the major reason for non-existence of a clear plateau region in the CSS curve of the [(1) over bar 17] crystal, while the joint effects of the scale change of the labyrinth structure and the formation of PSB ladder-like structures lead to the occurrence of only a narrow quasi-plateau in the CSS curve of the [017] crystal. 0 2002 Elsevier Science B.V. All rights reserved.
部门归属	chinese acad sci, met res inst, shenyang natl lab mat sci, state key lab fatigue & fracture mat, shenyang 110015, peoples r china. osaka univ, grad sch engn, dept mat sci & engn, osaka 5650871, japan.;li, xw (reprint author), chinese acad sci, met res inst, shenyang natl lab mat sci, state key lab fatigue & fracture mat, shenyang 110015, peoples r china
关键词	Cu Single Crystal Dislocation Structure Conjugate Double Slip Critical Double Slip Cyclic Deformation Crystallographic Orientation Cyclic Deformation-behavior Stress-strain Response Stereographic Triangle Plateau Behavior Orientation Saturation Bands Dependence Plasticity Amplitude
URL	查看原文
WOS记录号	WOS:000176666100007
引用统计	被引频次：31[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/321006/36319
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. W. Li,Y. Umakoshi,B. Gong,et al. Dislocation structures in fatigued critical and conjugate double-slip-oriented copper single crystals[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2002,333(1-2):51-59.
APA	X. W. Li,Y. Umakoshi,B. Gong,S. X. Li,&Z. G. Wang.(2002).Dislocation structures in fatigued critical and conjugate double-slip-oriented copper single crystals.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,333(1-2),51-59.
MLA	X. W. Li,et al."Dislocation structures in fatigued critical and conjugate double-slip-oriented copper single crystals".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 333.1-2(2002):51-59.