期刊
ACTA MATERIALIA
卷 100, 期 -, 页码 202-214出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.08.024
关键词
Tensile twin nucleation; AZ31 magnesium alloy; High resolution electron back-scatter diffraction (HR-EBSD); Geometrically necessary dislocations (GNDs); Dislocation density
资金
- National Science Foundation (NSF) [CMMI 0928923, 1404771]
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0012587]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1404771] Funding Source: National Science Foundation
Nucleation and propagation of tensile twins in magnesium alloy AZ31 are investigated for a large number of twins at an early stage of their development. High-resolution electron backscatter diffraction (HREBSD) techniques are employed to give additional insights. Correlations with grain orientation, boundary misorientation and active slip systems are observed in the region of twins that arise at grain boundaries. Two types of twin are identified: (1) slip-assisted twins that nucleate at grain boundaries with no apparent influence from nearby twins, and (2) twin-assisted twins that result from twins propagating across a grain boundary. Twinning occurs in hard grains that cannot accommodate necessary contraction via < a >-type slip. Slip assisted twins nucleate at high-angle boundaries. Twin-assisted twinning occurs at low-angle boundaries. The distributions of grain boundary misorientation associated with each type of twin nucleation are mapped, and a strong correlation between Schmid factor and the emerging twin variant is highlighted. (C) 2015 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