Plastic strain-induced grain refinement at the nanometer scale in copper

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	Plastic strain-induced grain refinement at the nanometer scale in copper
	K. Wang ; N. R. Tao ; G. Liu ; J. Lu ; K. Lu
刊名	Acta Materialia
	2006
卷号	54 期号:19 页码:5281-5291
关键词	grain refinement copper plastic deformation mechanical twinning strain rate mechanical attrition treatment low-carbon steel surface nanocrystallization deformation structures metallic materials evolution cu alloy layer smat
ISSN号	1359-6454
中文摘要	Microstructural evolution and grain refinement in pure Cu subjected to surface mechanical attrition treatment (SMAT) were investigated by means of systematic transmission electron microscope observations. Two different mechanisms for plastic strain-induced grain refinement in Cu were identified, corresponding to different levels of strain rate. In the subsurface layer of the SMAT Cu samples with low strain rates, grains are refined via formation of dislocation cells (DCs), transformation of DC walls into sub-boundaries with small misorientations, and evolution of sub-boundaries into highly misoriented grain boundaries. The minimum size of refined grains via this process is about 100 nm. In the top surface layer (thickness < 25 mu m) with a high strain rate, the grain refinement includes: (i) formation of high-density, nanometer-thick twins dividing the original coarse grains into twin-matrix (T-M) lamellae; (ii) development of dislocation walls that further subdivide the T-M lamellae into equiaxed nano-sized blocks; (iii) evolution of these preferentially oriented blocks into randomly oriented nanosized grains. The minimum size of such refined grains is about 10 nm. The present study demonstrates the critical role of strain rate on the plastic strain-induced grain refinement processes and on the minimum grain size obtainable via plastic deformation. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000242002800029
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34512]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Wang,N. R. Tao,G. Liu,et al. Plastic strain-induced grain refinement at the nanometer scale in copper[J]. Acta Materialia,2006,54(19):5281-5291.
APA	K. Wang,N. R. Tao,G. Liu,J. Lu,&K. Lu.(2006).Plastic strain-induced grain refinement at the nanometer scale in copper.Acta Materialia,54(19),5281-5291.
MLA	K. Wang,et al."Plastic strain-induced grain refinement at the nanometer scale in copper".Acta Materialia 54.19(2006):5281-5291.