Deformation mechanisms, activated slip systems and critical resolved shear stresses in an Mg-LPSO alloy studied by micro-pillar compression
Deformation mechanisms, activated slip systems and critical resolved shear stresses in an Mg-LPSO alloy studied by micro-pillar compression
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通过微柱压缩研究 Mg-LPSO 合金的变形机制、激活滑移系统和临界解析剪切应力
DOI：
10.1016/j.matdes.2018.05.037
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发表时间：
2018-09
影响因子：
8.4
通讯作者：
Raabe Dierk
中科院分区：
文献类型：
--
作者：
Chen Ran;S;loebes Stefanie;Zehnder Christoffer;Zeng Xiaoqin;Korte-Kerzel S;ra;Raabe Dierk
We study the micro-mechanical behaviour of single-crystalline long-period-stacking ordered (LPSO) structures, α-Mg and bi-crystalline Mg/LPSO micro-pillars, all cut from the same Mg 97 Y 2 Zn 1 (at.%) alloy. To investigate the deformation and co-deformation mechanisms of Mg-LPSO alloys we performed micro-pillar compression experiments with micro-pillars of an orientation inclined by 7°, 46° and 90° to (0001) orientation, respectively. Electron backscatter diffraction-assisted slip trace analysis and post-mortem transmission electron microscopy analysis showed predominant deformation by basal dislocation slip in 46°(0001) and 7°(0001) oriented micro-pillars. In 7°(0001) oriented micro-pillars additional non-basal dislocation slip and the formation of micro shear bands along pyramidal planes were activated in the α-Mg and the LPSO structure, respectively. In 90°(0001) oriented micro-pillars 1 1¯ 00 1¯ 1¯ 20 prismatic slip was predominantly activated during the early deformation stages. The relative magnitude of the critical stresses depends on the crystal phase as well as the crystallographic orientation, ie the activated slip system. Specifically, basal slip has the lowest critical resolved shear stress in both, α-Mg and the LPSO structure, while the CRSS of prismatic slip is about 5 times higher than basal slip in α-Mg and about 15 times higher than basal slip in LPSO.
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