SEM-ECC investigation of dislocation arrangements in cyclically deformed copper single crystals with different crystallographic orientations

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	SEM-ECC investigation of dislocation arrangements in cyclically deformed copper single crystals with different crystallographic orientations
	X. W. Li; Z. F. Zhang; Z. G. Wang; S. X. Li; Y. Umakoshi
	2001
发表期刊	Defects and Diffusion in Metals Iii
ISSN	1012-0386
卷号	188-1 页码:153-169
摘要	The dislocation arrangements induced by cyclic deformation in some differently oriented copper single crystals were investigated using electron channelling contrast (ECC) technique in scanning electron microscopy (SEM). It is shown that the ECC technique can well be used to examine dislocation arrangements in fatigued copper single crystals, especially at higher imposed plastic strain amplitudes. The typical dislocation structures in the cyclically deformed copper single crystals detected by this technique are in good agreement with those found by transmission electron microscopy (TEM). Furthermore, the SEM-ECC technique shows some attractive advantages compared to TEM. For instance, ECC observation clearly reveals an evolutional process of dislocation structure from the vein structure of matrix formed at lower strain amplitude to the labyrinth structure formed st higher strain amplitude. Moreover, the exact observations of dislocation arrangements within cyclic deformation bands (DBs), which are rather difficult to achieve by TEM, are successfully accomplished using the ECC method. The DBs formed in cyclically strained copper single crystals may exhibit quite different microstructures, depending upon their crystallographic orientation and accumulated plastic strain, such as PSB ladder, wall and labyrinth structures. Finally combining the existing TEM results with the present SEM-ECC observations, we can state with certainty that the crystallographic orientation has a strong effect on the saturation dislocation features of copper single crystals.
部门归属	chinese acad sci, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china. osaka univ, grad sch engn, dept mat sci & engn, suita, osaka 5650871, japan.;li, xw (reprint author), chinese acad sci, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china
关键词	Electron Channelling Contrast (Ecc) Dislocation Arrangement Copper Single Crystal Crystallographic Orientation Cyclic Deformation Deformation Band Electron Channeling Contrast Persistent Slip Bands Plastic Strain Amplitudes Deformation-behavior Stereographic Triangle Fatigue-crack Stress Nucleation Localization Microscope
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WOS记录号	WOS:000168223500013
引用统计	被引频次：32[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/321006/36703
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. W. Li,Z. F. Zhang,Z. G. Wang,et al. SEM-ECC investigation of dislocation arrangements in cyclically deformed copper single crystals with different crystallographic orientations[J]. Defects and Diffusion in Metals Iii,2001,188-1:153-169.
APA	X. W. Li,Z. F. Zhang,Z. G. Wang,S. X. Li,&Y. Umakoshi.(2001).SEM-ECC investigation of dislocation arrangements in cyclically deformed copper single crystals with different crystallographic orientations.Defects and Diffusion in Metals Iii,188-1,153-169.
MLA	X. W. Li,et al."SEM-ECC investigation of dislocation arrangements in cyclically deformed copper single crystals with different crystallographic orientations".Defects and Diffusion in Metals Iii 188-1(2001):153-169.