Cyclic deformation and dynamic compressive properties of copper bicrystals

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	Cyclic deformation and dynamic compressive properties of copper bicrystals
	R. Q. Yang; S. X. Li; Z. F. Zhang
	2007
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	466 期号:1-2 页码:207-217
摘要	Cyclic deformation and dynamic compressive tests of three copper bicrystals were carried out on a Shimadzu servo-hydraulic testing machine and a split Hopkinson pressure bar (SHPB) apparatus respectively. The post-deformation dislocation structures, grain boundary (GB) serrations and adiabatic shear bands (ASBs) were examined using electron channeling contrast (ECC) imaging in a scanning electron microscope (SEM). After cyclic straining the secondary slip bands were activated near the GB forming a GB affected zone (GBAZ). Microstructures beneath it are dislocation labyrinth or irregular persistent slip bands (PSBs). The saturation stress at GBAZ was calculated to be higher than that in the grain interior. In dynamic compression, the formation of ASBs, was found to be promoted by the GB. Dynamic stress-strain curves were compared with each other for single crystals, bicrystals and polycrystals. Microstructures were also characterized with orientation imaging microscopy (OIM) by electron backscattering diffraction (EBSD) technique. It was found that relatively larger lattice rotations occurred across the ASBs than in the other regions, which can be deduced by the localization of simple shear along ASBs. No recrystallization was found in the ASBs or along GBs in the present circumstance. (c) 2007 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang natl mat sci, shenyang 110016, peoples r china.;yang, rq (reprint author), chinese acad sci, inst met res, shenyang natl mat sci, shenyang 110016, peoples r china;rqyang@imr.ac.cn
关键词	Copper Bicrystal Grain Boundary Cyclic Straining Ebsd Dynamic Deformation Lattice Rotation Adiabatic Shear Bands Adiabatic Shear Bands Intergranular Fatigue Cracking Double Slip Orientation Aisi 4340 Steel Single-crystals Plastic-deformation Grain-boundaries Stereographic Triangle Dislocation-structures Ballistic Impact
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WOS记录号	WOS:000249051300031
引用统计	被引频次：5[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/321006/33974
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. Q. Yang,S. X. Li,Z. F. Zhang. Cyclic deformation and dynamic compressive properties of copper bicrystals[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2007,466(1-2):207-217.
APA	R. Q. Yang,S. X. Li,&Z. F. Zhang.(2007).Cyclic deformation and dynamic compressive properties of copper bicrystals.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,466(1-2),207-217.
MLA	R. Q. Yang,et al."Cyclic deformation and dynamic compressive properties of copper bicrystals".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 466.1-2(2007):207-217.