Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation

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	Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation
	C. S. Hong; N. R. Tao; X. Huang; K. Lu
	2010
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	58 期号:8 页码:3103-3116
摘要	Microstructural evolution associated with the shear banding in nano-scale twin/matrix (T/M) lamellae of a Cu-Al alloy processed by means of dynamic plastic deformation was investigated using transmission electron microscopy (TEM) and high-resolution TEM The development of a shear band was found to be a two-stage process, namely a nucleation stage resulting in a narrow band composed of nano-sized (sub)grams intersecting the T/M lamellae, followed by a thickening stage of the narrow band into adjacent T/M lamellae regions The nucleation stage occurred within a narrow region of an almost constant thickness (100-200 nm thick, referred to as "core" region) and consisted of three steps (I) initiation of localized deformation (bending, necking, and detwinning) against the T/M lamellae, (2) evolution of a dislocation structure within the detwinned band, and (3) transformation of the detwinned dislocation structure (DDS) into a nano-sized (sub)grain structure (NGS) On the two sides of a core region, two transition layers (TRLs) exist where the T/M lamellae experienced much less shear strain The interface boundaries separating the core region and the TRLs are characterized by very large shear strain gradients accommodated by high density of dislocations Increasing shear strains leads to thickening of shear bands at the expense of the adjoining T/M lamellae, which is composed of thickening of the core region by transforming the TR Ls into the core region with DDS and NOS, analogous to steps (2) and (3) of the nucleation process, and outward movement of the Tins by deforming the adjoining T/M lamellae Grain sizes in the well-developed shear bands are obviously larger than the lamellar thickness of original T/M lamellae (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved
部门归属	[hong, c. s.; tao, n. r.; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [huang, x.] tech univ denmark, riso natl lab sustainable energy, mat res div, danish chinese ctr nanomet, dk-4000 roskilde, denmark.;tao, nr (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Dynamic Plastic Deformation Shear Bands Nano-scale Twins Nano-grained Structure Dislocation Structure Coherent Twin Boundaries Copper Single-crystals Centered-cubic Metals Slip Dislocations Deformed Metals Fcc Metals Evolution Microstructure Recrystallization Texture
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WOS记录号	WOS:000276736200033
引用统计	被引频次：180[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/321006/31146
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. S. Hong,N. R. Tao,X. Huang,et al. Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation[J]. Acta Materialia,2010,58(8):3103-3116.
APA	C. S. Hong,N. R. Tao,X. Huang,&K. Lu.(2010).Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation.Acta Materialia,58(8),3103-3116.
MLA	C. S. Hong,et al."Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation".Acta Materialia 58.8(2010):3103-3116.