Crystallography of the Mg2Y precipitates in a damping Mg–Cu–Mn–Zn–Y alloy
Crystallography of the Mg2Y precipitates in a damping Mg–Cu–Mn–Zn–Y alloy
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DOI：
10.1107/s1600576716014953
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发表时间：
2016-12
影响因子：
6.1
通讯作者：
Xuefei Huang;Weigang Huang
中科院分区：
文献类型：
--
作者：
Xuefei Huang;Weigang Huang
用透射电镜研究了Mg-Cu-Mn-Zn-Y阻尼合金中Mg 2 Y相的晶体结构。Mg 2 Y与α-Mg基体之间的新型取向关系为[0001]p//[0001]α，β 10{\overline 1}0 β p//β 12 {\overline 1}0 β α和β 01{\overline 1}0 β p//β 11{\overline 2}0 β α。沉淀物呈现出具有四对小平面的多边形形态，每个小平面垂直于倒易空间中的Δg矢量。采用二次约束重合点点阵模型考察了各晶面的择优性。结果表明，一个更好的程度的晶格匹配，实现跨每个面比他们的邻位取向，表明积极有利的界面功能。利用O晶格模型计算了各界面上的错配补偿位错的组态。
The crystallography of the Mg2Y precipitates in an Mg–Cu–Mn–Zn–Y damping alloy has been characterized by transmission electron microscopy. The novel orientation relationship between Mg2Y and the α-Mg matrix was determined as [0001]p//[0001]α, 〈10{\overline 1}0〉p//〈2{\overline 1}{\overline 1}0〉α and 〈01{\overline 1}0〉p//〈11{\overline 2}0〉α. The precipitate exhibits a polygonal morphology with four pairs of facets, each of which is normal to a Δg vector in reciprocal space. The secondary constrained coincidence site lattice model was employed to examine the preference of each facet. The results show that a much better degree of lattice matching is realized across each facet than their vicinal orientations, indicating the energetically favoured feature of the interface. The configurations of the misfit-compensating dislocations across each interface were also calculated using the O-lattice model.