Study of fatigue dislocation structures in (2)over-bar33 coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast

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	Study of fatigue dislocation structures in (2)over-bar33 coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast
	Y. Zhou; X. W. Li; R. Q. Yang
	2008
发表期刊	International Journal of Materials Research
ISSN	1862-5282
卷号	99 期号:9 页码:958-963
摘要	Dislocation structures in fatigued [(2) over bar 33] coplanar double-slip-oriented copper single crystals were studied using the electron channelling contrast technique in scanning electron microscopy, especially focusing on the observations of the microstructures of persistent slip bands and deformation bands. It was found that, at low plastic strain amplitudes (gamma(pl) <= 3.4 x 10(-4)), the dislocation structures of the [(2) over bar 33] copper single crystal comprise a majority of elongated veins and a few elongated cells along the primary slip plane (111). As gamma(pl), increases to 6.2 x 10(-4), a special persistent slip band structure consisting of irregular dislocation cells, rather than generally-observed ladders in single-slip crystals, was found to form, which is responsible for the occurrence of a quasi-plateau in the cyclic stress-strain curve of the [(2) over bar 33] crystal. When gamma(pl), <= 3.5 x 10(-3), different dislocation microstructures in deformation bands, such as wall-like features, dislocation walls, elongated cells and dense dislocation cells, were found in the cyclically saturated [(2) over bar 33] crystal. Effects of the crystallographic orientation, the applied plastic strain amplitude, the accumulated plastic strain and the strain localization in the crystal on the microstructure of deformation bands are summarized and discussed.
部门归属	[zhou, yang; li, xiao-wu] ne univ, coll sci, inst mat phys & chem, shenyang 110004, peoples r china. [li, xiao-wu] ne univ, key lab anisotropy & texture mat, minist educ, shenyang, peoples r china. [yang, rui-qing] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang, peoples r china.;li, xw (reprint author), ne univ, coll sci, inst mat phys & chem, pob 104,3-11 wenhua rd, shenyang 110004, peoples r china;xwli@mail.neu.edu.cn
关键词	Copper Single Crystal Dislocation Structure Cyclic Deformation Coplanar Double Slip Sem-ecc Technique Cyclic Deformation-behavior Plastic Strain Amplitudes Conjugate Double-slip Bands Nucleation
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33396
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Zhou,X. W. Li,R. Q. Yang. Study of fatigue dislocation structures in (2)over-bar33 coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast[J]. International Journal of Materials Research,2008,99(9):958-963.
APA	Y. Zhou,X. W. Li,&R. Q. Yang.(2008).Study of fatigue dislocation structures in (2)over-bar33 coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast.International Journal of Materials Research,99(9),958-963.
MLA	Y. Zhou,et al."Study of fatigue dislocation structures in (2)over-bar33 coplanar double-slip-oriented copper single crystals using SEM electronic channelling contrast".International Journal of Materials Research 99.9(2008):958-963.