High-strength and good-ductility Mg–RE–Zn–Mn magnesium alloy with long-period stacking ordered phase
High-strength and good-ductility Mg–RE–Zn–Mn magnesium alloy with long-period stacking ordered phase
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DOI：
10.1016/j.matlet.2012.11.076
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发表时间：
2013-02
影响因子：
3
通讯作者：
Jingfeng Wang;Pengfei Song;Song-Jeng Huang;F. Pan
中科院分区：
文献类型：
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作者：
Jingfeng Wang;Pengfei Song;Song-Jeng Huang;F. Pan
研究了Mg-8.40Gd-5.30Y-1.65Zn-0.59Mn（wt%）合金的显微组织和力学性能。合金的相组成为α-Mg基体和长周期堆积的Mg 12 Zn（Y，Gd）有序相及部分共晶相。合金经挤压（挤压比为11：1，挤压温度为400°C）后，在200°C时效50 h后，获得了较高的强度（抗拉强度≥ 500 MPa，拉伸屈服强度≥ 322 MPa）和良好的塑性（伸长率≥ 10.0%），并表现出优异的综合力学性能。这是由于α-Mg基体中大量的板状β′相析出，以及沿晶界沿着排列的小块状长周期有序相。
The microstructure and mechanical properties of Mg–8.40Gd–5.30Y–1.65Zn–0.59Mn (wt%) alloy were investigated in this study. The phase composition of the alloy involved an α-Mg matrix and long-period stacking ordered phases of Mg12Zn(Y,Gd) with some eutectic phases. After aging at 200°C for 50h following extrusion (extrusion ratio= 11:1, extrusion temperature=400°C), the alloy achieved high strength (ultimate tensile strength=∼500MPa, tensile yield strength=∼322MPa) and good ductility (elongation=∼10.0%) and exhibited excellent comprehensive mechanical properties. These properties could be attributed to the numerous plate-shaped β′ phase precipitates in the α-Mg matrix, as well as the small dispersed block-shaped long-period stacking ordered phases along the grain boundaries.