Effect of grain size on grain boundary strengthening of copper bicrystals under cyclic loading

IMR OpenIR

	Effect of grain size on grain boundary strengthening of copper bicrystals under cyclic loading
	Z. F. Zhang; Z. G. Wang; Y. M. Hu
	2000
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	16 期号:2 页码:157-162
摘要	To clarify the strengthening effect of grain boundaries (GB), cyclic deformation behaviour of really grown [(4) over bar 79]parallel to[(1) over bar 25] copper bicrystals with different widths (4, 6, and 8 mm, denoted RB-4, RB-6, and RB-8) of component crystals and a combined copper bicrystal (denoted CB-6), obtained by sticking component single crystals G1 [(4) over bar 79] and G2 [(1) over bar 25] together, was investigated. The results showed that the cyclic saturation stresses increased in the order of bicrystals of CB-6 < RB-8 < RB-6 < RB-4. It is indicated that the GB effect caused different degrees of strengthening, which increased with the decreasing width of the RE bicrystals, By surface observation, it was found that only the primary slip system was activated in the combined bicrystal during cyclic deformation. However, an additional slip system appeared near the GB within the crystal G2 [(1) over bar 25] in the RB bicrystals (except in the primary slip system), and formed a GB affected zone (GBAZ), The width of the GBAZ was about 400 and 600 mu m at plastic strain amplitudes of 0.1% and 0.2% respectively. Meanwhile, using an electron channelling contrast (ECC) technique in the SEM, the dislocation patterns near the (GB and within the component crystals were observed. It was found that a two phase structure of persistent slip bands (PSBs) and matrix (or veins) can form in these bicrystals, similar to that in copper single crystals. But these PSBs cannot transfer through the GB during cyclic deformation. Based on the results above, the effect of grain size on GB strengthening of copper bicrystals was discussed. MST/4267.
部门归属	acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;zhang, zf (reprint author), acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china
关键词	Electron Channeling Contrast Stress-strain Curves Single-crystals Deformation-behavior Fatigue Polycrystals Microscopy Amplitude Aluminum Metals
URL	查看原文
WOS记录号	WOS:000085596900006
引用统计	被引频次：4[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/321006/37264
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. F. Zhang,Z. G. Wang,Y. M. Hu. Effect of grain size on grain boundary strengthening of copper bicrystals under cyclic loading[J]. Materials Science and Technology,2000,16(2):157-162.
APA	Z. F. Zhang,Z. G. Wang,&Y. M. Hu.(2000).Effect of grain size on grain boundary strengthening of copper bicrystals under cyclic loading.Materials Science and Technology,16(2),157-162.
MLA	Z. F. Zhang,et al."Effect of grain size on grain boundary strengthening of copper bicrystals under cyclic loading".Materials Science and Technology 16.2(2000):157-162.