Strain-induced grain refinement of cobalt during surface mechanical attrition treatment

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	Strain-induced grain refinement of cobalt during surface mechanical attrition treatment
	X. Wu; N. Tao; Y. Hong; G. Liu; B. Xu; J. Lu; K. Lu
	2005
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	53 期号:3 页码:681-691
摘要	The microstructural evolution during surface mechanical attrition treatment of cobalt (a mixture of hexagonal close packed (hep) and face-centered cubic (fcc) phases) was investigated. in order to reveal the mechanism of grain refinement and strain accommodation. The microstructure was systematically characterized by both cross-sectional and planar-view transmission electron microscopy. In the hcp phase, the process of grain refinement. accompanied by an increase in strain imposed in the surface layer. involved: (1) the onset of 110 111 deformation twinning, (2) the operation of (1 120) 110 1 0} prismatic and (1 120) (000 1) basal slip, leading to the formation of low-angle dislocation boundaries, and (3) the successive subdivision of grains to a finer and finer scale. ressulting in the formation of highly misoriented nanocrystalline grains. Moreover. the formation of nanocrystalliies at the grain boundary and triple junction was also observed to occur concurrently with straining. By contrast. the fec phase accommodated strain in a sequence as follows: (1) slip of dislocations by forming intersecting planar arrays of dislocations, (2) {1 1 1} deformation twinning, and (3) the gamma(fcc) --> epsilon(hcp) martensitic phase transformation. The mechanism of grain refinement was interpreted in terms of the structural subdivision of grains together with dynamic recrystallization occurring in the hep phase and the gamma --> E: martensitic transformation in the fcc phase as well. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, inst mech, state key lab nonliner mech, beijing 100080, peoples r china. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. taiyuan univ technol, coll mat sci & technol, taiyuan 030024, peoples r china. univ tech troyes, lasmis, f-10000 troyes, france.;wu, x (reprint author), chinese acad sci, inst mech, state key lab nonliner mech, beijing 100080, peoples r china;xlwu@imech.ac.cn
关键词	Nanostructure Plastic Deformation Martensitic Transformation Surface Mechanical Attrition Treatment Cobalt Nanocrystalline Aluminum Plastic-deformation Ambient-temperature Stainless-steel Slip Modes Hcp Cobalt Metals Microstructure Nanoscale Evolution
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WOS记录号	WOS:000226711600013
引用统计	被引频次：218[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/321006/35135
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Wu,N. Tao,Y. Hong,et al. Strain-induced grain refinement of cobalt during surface mechanical attrition treatment[J]. Acta Materialia,2005,53(3):681-691.
APA	X. Wu.,N. Tao.,Y. Hong.,G. Liu.,B. Xu.,...&K. Lu.(2005).Strain-induced grain refinement of cobalt during surface mechanical attrition treatment.Acta Materialia,53(3),681-691.
MLA	X. Wu,et al."Strain-induced grain refinement of cobalt during surface mechanical attrition treatment".Acta Materialia 53.3(2005):681-691.