Configuration of dislocations in low-angle kink boundaries formed in a single crystalline long-period stacking ordered Mg-Zn-Y alloy

被引:99
作者
Matsumoto, Tsubasa [1 ]
Yamasaki, Michiaki [1 ]
Hagihara, Koji [2 ]
Kawamura, Yoshihito [1 ]
机构
[1] Kumamoto Univ, Magnesium Res Ctr, Dept Mat Sci, Chuo Ku, 2-39-1 Kurokami, Kumamoto 8608555, Japan
[2] Osaka Univ, Grad Sch Engn, Dept Adapt Machine Syst, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
关键词
Magnesium; Long-period stacking ordered structure; Kink deformation; Dislocation; TRANSMISSION ELECTRON-MICROSCOPY; MG97ZN1Y2 EXTRUDED ALLOY; LPSO PHASE; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; GD ALLOY; MULTIMODAL MICROSTRUCTURE; COMPRESSIVE DEFORMATION; PLASTICITY ANALYSIS; MG97Y2ZN1; ALLOY;
D O I
10.1016/j.actamat.2018.03.034
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The dislocation configuration around low-angle kink boundaries formed in bent single crystalline long-period stacking ordered (LPSO) Mg85Zn6Y9 alloys was investigated. Intragranular misorientation axis (IGMA) analysis through SEM/EBSD observation and g center dot b analysis through TEM observation were conducted. Various kink bands possessing different lattice rotation axes ranging from <1100> to <1210>, i.e. along <1100>, <uvtO> and <1210> were revealed using IGMA analysis. TEM observation with g center dot b analysis unveiled that the <1100>-rotation kink boundary observed using IGMA analysis consisted of basal <a> edge dislocations with one Burgers vector, while the <121 0>/<uvtO>-rotation kink boundaries were comprised of basal <a> edge dislocations with more than one Burgers vector. Low-angle kink boundaries were regarded as low-angle tilt boundaries consisting of perfect basal <a> dislocations, regardless of their rotation axes. The formation of various kink bands with -combination-rotation axes ranging from <1100> to <1210> suggests that the statistically stored basal <a> dislocations may turn into geometrically necessary basal <a> edge dislocations during the initial stage of low-angle kink boundary formation. When a kink boundary is considered as a disclination, IGMA analysis capable of determining the lattice rotation axis and the angle is effective in evaluating the Frank vector of the kink boundary. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
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页码:112 / 124
页数:13
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