An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment

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	An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment
	N. R. Tao ; Z. B. Wang ; W. P. Tong ; M. L. Sui ; J. Lu ; K. Lu
刊名	Acta Materialia
	2002
卷号	50 期号:18 页码:4603-4616
关键词	nanocrystalline materials iron grain refinement microstructure severe plastic-deformation grain-size nanostructured materials iron evolution alloys microstructure refinement ductility steel
ISSN号	1359-6454
中文摘要	By means of surface mechanical attrition (SMA), a nanostructured surface layer was formed on a pure Fe plate. Microstructure features of various sections in the surface layer, from the strain-free matrix to the treated top surface, were systematically characterized by using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. Based on the experimental observations, a grain refinement mechanism induced by plastic deformation during the SMA treatment in Fe was proposed. It involves formation of dense dislocation walls (DDWs) and dislocation tangles (DTs) in original grains and in the refined cells (under further straining) as well, transformation of DDWs and DTs into subboundaries with small misorientations separating individual cells or subgrains, and evolution of subboundaries to highly misoriented grain boundaries. Experimental evidences and analysis of the grain refinement mechanism indicate that high strains with a high strain rate are necessary for formation of nanocrystallites during plastic deformation of metals. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
原文出处	://WOS:000178934800014
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/36421]
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	N. R. Tao,Z. B. Wang,W. P. Tong,et al. An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment[J]. Acta Materialia,2002,50(18):4603-4616.
APA	N. R. Tao,Z. B. Wang,W. P. Tong,M. L. Sui,J. Lu,&K. Lu.(2002).An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment.Acta Materialia,50(18),4603-4616.
MLA	N. R. Tao,et al."An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment".Acta Materialia 50.18(2002):4603-4616.