摘要
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.
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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2007年第A01期457-460,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(2006FJ4238) supported by the Research Fund for the Post-Doctoral Program of Hunan Province, China
关键词
镁合金
物理性能
电子
转移模式
multiple twins
in-situ TEM experiments
crack
AZ31 Mg alloys
