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Title:
Deformation twinning in nanocrystalline materials
Author: Zhu YT; Liao XZ; Wu XL(武晓雷)
Source: Progress in Materials Science
Issued Date: 2012-01
Volume: 57, Issue:1, Pages:1-62
Abstract:

Nanocrystalline (nc) materials can be defined as solids with grain sizes in the range of 1–100 nm. Contrary to coarse-grained metals, which become more difficult to twin with decreasing grain size, nanocrystalline face-centered-cubic (fcc) metals become easier to twin with decreasing grain size, reaching a maximum twinning probability, and then become more difficult to twin when the grain size decreases further, i.e. exhibiting an inverse grain-size effect on twinning. Molecular dynamics simulations and experimental observations have revealed that the mechanisms of deformation twinning in nanocrystalline metals are different from those in their coarse-grained counterparts. Consequently, there are several types of deformation twins that are observed in nanocrystalline materials, but not in coarse-grained metals. It has also been reported that deformation twinning can be utilized to enhance the strength and ductility of nanocrystalline materials. This paper reviews all aspects of deformation twinning in nanocrystalline metals, including deformation twins observed by molecular dynamics simulations and experiments, twinning mechanisms, factors affecting the twinning, analytical models on the nucleation and growth of deformation twins, interactions between twins and dislocations, and the effects of twins on mechanical and other properties. It is the authors’ intention for this review paper to serve not only as a valuable reference for researchers in the field of nanocrystalline metals and alloys, but also as a textbook for the education of graduate students.

Keyword: molecular-dynamics simulation ; stacking-fault energy ; severe plastic-deformation ; strain-rate sensitivity ; high-pressure torsion ; centered-cubic metals ; hall-petch relation ; grain-boundary structure ; nano-scale twins ; austenitic stainless-steels
Language: 英语
Indexed Type: SCI ; EI
DOC Type: Article
WOS ID: WOS:000295306300001
ISSN: 0079-6425 
Subject: 固体力学::微机电系统中的固体力学问
Department: LNM材料介观力学性能的表征
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/45738
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Zhu YT,Liao XZ,Wu XL. Deformation twinning in nanocrystalline materials[J]. Progress in Materials Science,2012-01-01,57(1):1-62.
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