Effect of aluminum or zinc solute addition on enhancing impact fracture toughness in Mg-Ca alloys
Effect of aluminum or zinc solute addition on enhancing impact fracture toughness in Mg-Ca alloys
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DOI：
10.1016/j.actamat.2015.11.045
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发表时间：
2016-02-01
期刊：
影响因子：
9.4
通讯作者：
Mukai, Toshiji
中科院分区：
文献类型：
--
作者：
Hase, Takayuki;Ohtagaki, Tatsuya;Mukai, Toshiji
本文用冲击三点弯曲法测定了Mg、Mg-0.3at %Ca-0.6at %Zn和Mg-0.3at %Ca-0.6at %Al三种合金的冲击韧性。通过第一性原理计算，估算了Mg、二元Mg-Ca、三元Mg-Ca-Zn和三元Mg-Ca-Al合金的广义层错能和晶界结合能。计算结果与实验结果趋势一致。结果表明，Ca沿着Zn或Al的加入降低了塑性各向异性，强化了晶界，从而提高了镁合金的冲击韧性。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司发布。保留所有权利。
We measured the impact toughness of three alloys (Mg, Mg-0.3 at%Ca-0.6 at%Zn, and Mg-0.3 at%Ca-0.6 at %Al) by the impact three-point bending test The plastic deformability and impact toughness were higher in the ternary alloys than in pure Mg. The generalized stacking fault energy and grain boundary cohesive energy were estimated by first-principles calculations for Mg, binary Mg-Ca, ternary Mg-Ca-Zn, and ternary Mg-Ca-Al alloys. The calculation results agreed with the trend in the experimental results. We suggest that addition of Ca along with Zn or Al reduced plastic anisotropy and strengthened the grain boundaries, leading to higher in impact toughness of Mg alloys. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.