Micro-Kinking of the Long-Period Stacking/Order (LPSO) Phase in a Hot-Extruded Mg97Zn1Y2 Alloy
Micro-Kinking of the Long-Period Stacking/Order (LPSO) Phase in a Hot-Extruded Mg97Zn1Y2 Alloy
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DOI：
10.2320/matertrans.mi201216
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发表时间：
2013-05
影响因子：
1.2
通讯作者：
D. Egusa;M. Yamasaki;Y. Kawamura;E. Abe
中科院分区：
文献类型：
--
作者：
D. Egusa;M. Yamasaki;Y. Kawamura;E. Abe
采用透射电子显微镜（TEM）研究了热挤压Mg 97 Zn 1 Y2合金中长周期堆垛/有序（LPSO）相的微观结构，特别是对扭结变形的LPSO晶体进行了研究。研究发现，LPSO相晶粒的扭结变形主要表现为奇异的直界面，在直界面上，主晶发生急剧弯曲，这与先前报道的结果相似。除了这些常见的LPSO相扭结带之外，我们偶尔会在扭结边界处发现独特的微观痕迹，其由多个分段的扭结界面组成，这些扭结界面在同一方向上以小角度顺序旋转，实现宏观的大结晶弯曲;即，微扭结特征。这种微扭结的发生很难解释的偶极对位错的产生在扭结的早期阶段，已成功地用于扭结变形的唯象理解。[doi：10.2320/matertrans.MI201216]
Microstructures of a hot-extruded Mg97Zn1Y2 alloy containing the long-period stacking/order (LPSO) phase have been investigated by transmission electron microscopy (TEM), particularly focusing on kink-deformed LPSO crystals. It is found that kink-deformation in the LPSO phase grains are mostly characterized by singular straight interfaces across which the host crystals are sharply bended, as being similar to those reported previously. In addition to these common LPSO phase kink-bands, we occasionally find unique microscopic traces at the kinkboundaries, which are composed of multiply segmented kink-interfaces that are sequentially rotated with small angles in a same direction, accomplishing a macroscopic large crystalline bend; i.e., a micro-kinking feature. Occurrence of such micro-kinking may hardly be explained by generation of dipole-pair dislocations in the early stage of kinking, which have been successfully used for phenomenological understanding of kink deformation. [doi:10.2320/matertrans.MI201216]