Dislocation structure in rapidly solidified Mg97Zn1Y2 alloy with long period stacking order phase
Dislocation structure in rapidly solidified Mg97Zn1Y2 alloy with long period stacking order phase
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DOI：
10.2320/matertrans.46.361
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发表时间：
2005-02-01
影响因子：
1.2
通讯作者：
Nishida, M
中科院分区：
文献类型：
--
作者：
Matsuda, M;Ando, S;Nishida, M
用常规透射电镜研究了快速凝固M97Zn1Y2合金中长周期堆垛层序（LPSO）相的位错结构。在具有LPSO相的晶粒中，基面上没有a位错，并且可以看到c除以a的位错数。另一方面，在没有LPSO相的晶粒中，存在许多位于基面上的直α位错。这些事实表明，LPSO相的形成增加了基面的临界分辨剪切应力，并且通过阻止基面滑移来激活非基面滑移。即前者直接促进了滑移系的强化，而后者则随着滑移系数目的增加而提高了延性。因此，可以得出结论，LPSO相起着独特的作用，克服了本合金的力学性能的强度和塑性的冲突性能。
Dislocation structure in rapidly solidified M97Zn1Y2 ribbon with the long period stacking order (LPSO) phase is investigated by conventional transmission electron microscopy. In the grain with the LPSO phase there are no a dislocations lying on the basal plane, and a number of c divided by a dislocations are visible. On the other hand, in the grain without the LPSO phase there are many straight a dislocations lying on the basal plane. These facts indicate that the critical resolved shear stress of the basal plane increases by the formation of the LPSO phase and the non-basal slip is activated by the prevention of the basal slip. In other words, the former directly contributes to the strengthening and the latter relates to the improvement of ductility with the increment of the number of the slip system. Therefore, it is concluded that the LPSO phase plays a unique role which overcomes the conflicting properties of strength and ductility in the mechanical property of the present alloy.