Nucleation and thickening of shear bands in nano-scale twin/matrix lamellae of a Cu-Al alloy processed by dynamic plastic deformation
文献类型：期刊论文
| 作者 | C. S. Hong ; N. R. Tao ; X. Huang ; K. Lu |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2010 |
| 卷号 | 58期号:8页码:3103-3116 |
| 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 |
| ISSN号 | 1359-6454 |
| 中文摘要 | 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 |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31146]  |
| 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 | 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. |
入库方式： OAI收割
来源：金属研究所
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