期刊
ACTA MATERIALIA
卷 58, 期 19, 页码 6217-6229出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.07.036
关键词
Magnesium; Nanocrystalline; Plastic deformation; Molecular dynamics
资金
- DOE NERI [DE-FC07-07ID14833]
- NSF [DMR-0605406, DMR-0845868]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0845868] Funding Source: National Science Foundation
Plastic deformation of nanocrystalline Mg is studied using molecular dynamics simulation. In a [1 1 (2) over bar 0]-textured structure, slip and twinning behaviors are observed during tensile loading. Various twinning and slip process are identified, with basal;slip and tensile {1 0 (1) over bar 2}< 1 0 (1) over bar 1 > twinning being dominant. For grain sizes larger than similar to 30 tun, basal slip occurs at a lower strain than twinning; for smaller grain sizes, twinning takes place at a lower strain than slip. For small grain sizes, the system generates partial dislocations; extended or full type dislocations are generated at high stress and large grain sizes. As the external stress increases, pyramidal < c + a > dislocations are also frequently generated, leading to a reduction in twinning activity. Whereas, under low stresses only the tensile twin is created at the grain boundaries, under high stress compressive twins are created at grain boundaries and in the interior of grains. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据