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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Interaction of crack with twins in hot-rolling AZ31 magnesium alloys during in-situ TEM straining experiments
WU Luo-yi(吴落义)1, WU Cui-lan(伍翠兰)1, XIA Wei-jun(夏伟军)2, CHEN Zhen-hua(陈振华)2

1. Center of High Resolution Electron Microscopy, College of Materials Science and Engineering,
Hunan University, Changsha 410082, China;
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:In-situ straining experiments in transmission electron microscopy were performed to investigate the propagation of crack, twinning and interaction of crack with twins. Lots of micro-twins were observed in the deformation band near the tip of crack. The stress is relaxed by the formation of micro-twins and the densely developed micro-twins prevent the growth of crack from the deformation band, subsequently the cracks extend into adjacent grains across grain boundaries, and grow along cleavage plane. Multiple twins are observed in hot-rolling AZ31 magnesium alloys, when cracks propagate into twins through twin grain boundaries(GBs), the direction of growth deviates. It is concluded that twins, especially multiple twins effectively baffle the development of crack.

 

Key words: multiple twins; in-situ TEM experiments; crack; AZ31 Mg alloys

ISSN 1672-7029
CN 43-1423/U

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