Local Strain Fields of LPSO in Mg-Based Ternary Alloys
Local Strain Fields of LPSO in Mg-Based Ternary Alloys
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DOI：
10.2320/matertrans.mh201404
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发表时间：
2015-07
影响因子：
1.2
通讯作者：
Shuhei Matsunaga;T. Kiguchi;Kazuhisa Sato;T. Konno
中科院分区：
文献类型：
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作者：
Shuhei Matsunaga;T. Kiguchi;Kazuhisa Sato;T. Konno
L12型TM 6 RE 8团簇分布在LPSO（长周期堆积有序结构）的富集层中，并沿[0001]Mg方向收缩。从局域应变场的角度研究了LPSOs的生长机制。富集层的面外正应变强度随富集层中溶质元素的平均半径而变化。第一性原理计算表明，溶质元素的平均原子半径与团簇的结构弛豫有关。Zn的结论，认为Mg与溶质元素的平均原子半径差控制了溶质元素位移引起的团簇收缩程度，是引起富集层面外法向应变的主导因素。[doi：10.2320/matertrans.MH201404]
L12-type TM6RE8 clusters are distributed in enriched layers of LPSO (long period stacking ordered structure), and shrink in the [0001]Mg direction. The growth mechanism of LPSOs was investigated from the viewpoint of a local strain field. The strength of out-of plane normal strain of the enriched layer varied with the average radius of solute elements in the layer. The first principle calculation showed that there is a relationship between the average atomic radius of solute elements and the structural relaxation in the clusters. Zn conclusion, it is suggested that the difference of average atomic radius between Mg and solute elements controls the degree of the cluster shrinkage by the displacement of the solute elements, and that it is the dominant factor giving rise to the out-of plane normal strains of the enrichment layers. [doi:10.2320/matertrans.MH201404]