Effects of stacking sequence and short-range ordering of solute atoms on elastic properties of Mg-Zn-Y alloys with long-period stacking ordered structures
Effects of stacking sequence and short-range ordering of solute atoms on elastic properties of Mg-Zn-Y alloys with long-period stacking ordered structures
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DOI：
10.1016/j.actamat.2015.06.005
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发表时间：
2015-09-01
期刊：
影响因子：
9.4
通讯作者：
Nagai, Y.
中科院分区：
文献类型：
--
作者：
Tane, M.;Kimizuka, H.;Nagai, Y.
研究了18 R型和10 H型长周期堆积有序（LPSO）结构Mg-Zn-Y合金单晶的堆积顺序和溶质原子短程有序对弹性性能的影响。制备了两种定向凝固（DS）Mg-Zn-Y合金多晶，主要由18 R-或10 H-型LPSO结构组成，而不是单晶，其生长可能相当困难。X射线极图分析表明，纤维织构，这在两个制备的合金不同，形成在DS多晶。对于DS多晶体，在从300到7.5或5.5K的冷却过程中测量了一套完整的弹性常数。通过分析DS多晶体的弹性刚度的基础上，一个新开发的逆Voigt-Reuss-Hill近似，其中详细的晶体织构可以考虑，从300至7.5或5.5 K的单晶LPSO相的弹性刚度组件被确定。18 R-和10 H-LPSO相的弹性性能也进行了评估的第一性原理计算的基础上密度泛函理论。在5.5或7.5 K的第一性原理计算的测量的弹性性质的比较表明，LPSO相的弹性性质几乎占主导地位的LPSO结构的堆叠顺序和短程有序溶质原子团簇的形成能量，形成在四个连续的原子堆叠层。重要的是，形成能和堆叠顺序的影响是显着的弹性模量相关的堆叠层之间的原子键合。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The effects of stacking sequence and short-range ordering of solute atoms on the elastic properties of Mg-Zn-Y alloy single crystals with an 18R- or 10H-type long-period stacking ordered (LPSO) structure were studied. Instead of single crystals, the growth of which can be quite difficult, two directionally solidified (DS) Mg-Zn-Y alloy polycrystals, mainly consisting of 18R- or 10H-type LPSO structure, were prepared. X-ray pole figure analyses revealed that fiber textures, which differed in the two prepared alloys, were formed in the DS polycrystals. For the DS polycrystals, a complete set of elastic constants was measured during cooling from 300 to 7.5 or 5.5 K. By analyzing the elastic stiffness of DS polycrystals on the basis of a newly developed inverse Voigt-Reuss-Hill approximation, in which the detailed crystallographic texture could be taken into account, the elastic stiffness components of the single-crystalline LPSO phases from 300 to 7.5 or 5.5 K were determined. The elastic properties of the 18R- and 10H-LPSO phases were also evaluated by first-principles calculations based on density functional theory. Comparison of the measured elastic properties at 5.5 or 7.5 K with the first-principles calculations revealed that the elastic properties of the LPSO phase were virtually dominated by the stacking sequence of the LPSO structures and the formation energy of short-range ordered solute atom clusters, formed at the four consecutive atomic stacking layers. Importantly, the effects of the formation energy and stacking sequence were significant in the elastic moduli related to the atomic bonding between the stacking layers. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.