Effect of solid solution and aging treatments on the microstructures evolution and mechanical properties of Mg–14Gd–3Y–1.8Zn–0.5Zr alloy
Effect of solid solution and aging treatments on the microstructures evolution and mechanical properties of Mg–14Gd–3Y–1.8Zn–0.5Zr alloy
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DOI：
10.1016/j.jallcom.2012.12.093
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发表时间：
2013-04
影响因子：
6.2
通讯作者：
Song Zhang;Wencai Liu;Xiyao Gu;Chen Lu;G. Yuan;W. Ding
中科院分区：
文献类型：
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作者：
Song Zhang;Wencai Liu;Xiyao Gu;Chen Lu;G. Yuan;W. Ding
研究了固溶和时效处理对Mg-14 Gd-3 Y-1.8Zn-0.5Zr合金铸态组织演变和力学性能的影响。利用XRD、SEM和TEM对合金中的14 H型长周期堆垛有序（LPSO）结构和稀土沉淀相进行了观察和分析。通过维氏硬度和室温拉伸试验对合金的力学性能进行了评价。结果表明，随着固溶时间的延长，合金中14 H-LPSO相的体积分数逐渐增加。当合金在793 K固溶10 h，498 K时效16 h时，稀土析出相的体积分数最大，在此最佳条件下，合金的室温力学性能达到极限抗拉强度366 MPa，屈服强度230 MPa，延伸率2.8%。GWZK合金的优良性能是由于固溶时效过程中14 H-LPSO组织的致密析出和稀土元素在基体中的析出所致。
The effects of solid solution and aging treatments on the microstructure evolution and mechanical property of the as-cast Mg–14Gd–3Y–1.8Zn–0.5Zr alloy are investigated in this study. The microstructures of the 14H type long period stacking ordered (LPSO) structure and RE precipitates in the conditioned alloys are observed and analyzed by XRD, SEM and TEM. The mechanical properties of the alloys are evaluated Vickers hardness and ambient-temperature tensile tests. The results show that the volume fraction of 14H-LPSO structure in the alloy increased gradually with continued solution. The maximum volume fraction of RE precipitates is obtained when the alloy is solid-solution-treated at 793K for 10h and subsequently aged at 498K for 16h, under this optimum condition the mechanical properties (ultimate tensile strength: 366MPa, yield strength: 230MPa, elongation: 2.8%) at ambient temperature are achieved. The good performance of the studied GWZK alloy results from the dense precipitation of 14H-LPSO structure and RE precipitates in the matrix during the solid solution and aging process.