Mg-Al-Gd合金中长周期堆积有序（LPSO）结构的畴结构和有序化过渡态
Domain structures and the transitional state of ordering in long-period stacking ordered (LPSO) structures in Mg-Al-Gd alloy
摘要：
用扫描透射电镜研究了Mg-Al-Gd合金中长周期堆垛有序结构的有序化过渡状态。结果表明，畴是观察到的过渡态的起源。三个新的模式的集群在此状态下可以充分解释的L12型集群位于不同领域的叠加。通过不同的倾斜视图进一步验证了这些畴。时效过程中择优畴的增长将导致最终的有序LPSO结构。基于畴的概念，也可以理解其他稀合金中的无序LPSO结构。
英文摘要：
The transitional state of ordering in the long-period stacking ordered (LPSO) structure in Mg-Al-Gd alloy has been investigated by scanning transmission electron microscopy. It is found that the domains are the origin of observed transitional state. Three new patterns of clusters at this state can be fully explained by the superimposition of L12 type clusters located in different domains. The domains are further verified by different tilted views. Growth of preferred domains during ageing process will result in final ordered LPSO structure. Based on the idea of domains, less ordered LPSO structure in other dilute alloys can be also understood.
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