Effect of Zn addition on microstructure and mechanical properties of Mg–9Gd–3Y–0.5Zr alloy
Effect of Zn addition on microstructure and mechanical properties of Mg–9Gd–3Y–0.5Zr alloy
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DOI：
10.1557/jmr.2017.458
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发表时间：
2018-03
影响因子：
2.7
通讯作者：
Wendong Cui;Lv Xiao;Wencai Liu;Guohua Wu;Xianfei Wang;Zhong-quan Li
中科院分区：
文献类型：
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作者：
Wendong Cui;Lv Xiao;Wencai Liu;Guohua Wu;Xianfei Wang;Zhong-quan Li
研究了Mg-9 Gd-3 Y-xZn-0.5Zr（x = 0，0.2，0.5，1.0和1.5）（wt%）合金在不同热处理条件下的显微组织、力学性能和断裂行为。结果表明，铸态合金由镁基体、共晶化合物和立方相组成。Zn含量≤ 0.2wt%的合金中，共晶相为Mg 24（Gd，Y）5，其余3种合金中，共晶相为（Mg，Zn）3RE。铸态含锌合金基体内部形成细小的片层状长周期堆垛有序组织，其数量随锌含量的增加而增加。Zn含量≥ 0.5wt%的合金固溶处理后，在镁基体的晶界处观察到Mg_12（Gd，Y）Zn相。峰值时效Mg-9 Gd-3 Y-0.5Zn-0.5Zr合金具有较好的强度和伸长率，屈服强度为244 MPa，抗拉强度为371 MPa，伸长率为3.8%。同时，还研究了所研究合金的断裂行为。
A comparison of microstructure, mechanical properties and fracture behavior of Mg–9Gd–3Y– x Zn–0.5Zr ( x = 0, 0.2, 0.5, 1.0, and 1.5) (wt%) alloys under different thermal treatment conditions was investigated in this study. The results showed that the as-cast alloys were comprised of Mg matrix, eutectic compounds and cuboid-shaped phases. The eutectics were Mg_24(Gd, Y)_5 in the alloys of Zn content ≤0.2 wt%, while (Mg, Zn)_3RE in the other three alloys. Fine lamellar long period stacking ordered structure formed inside of matrix of the as-cast Zn-containing alloys and its quantity increases with raising Zn content. Mg_12(Gd, Y)Zn was observed at grain boundary of Mg matrix after solution treatment in the alloys of Zn content ≥0.5 wt%. Peak-aged Mg–9Gd–3Y–0.5Zn–0.5Zr alloy exhibited a desirable combination of strength and elongation with 244 MPa in yield strength, 371 MPa in ultimate tensile strength and 3.8% in EL. Meanwhile, the fracture behavior of the studied alloys was also investigated.