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对热处理的挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能的影响进行了实验性探究。结果显示热处理对挤压态Mg-9Sn-1.5Y-0.4Zr镁合金显微组织与力学性能具有显著影响。挤压态合金主要由非均匀分布的Mg2Sn相组成。经过495℃,10 h固溶处理之后,大部分Mg2Sn相溶入到基体中。时效处理能大幅改善Mg-9Sn-1.5Y-0.4Zr合金的力学性能,最佳时效工艺为:在250℃条件下时效60 h。实验最终力学性能参数为:维氏硬度HV 890 MPa,极限抗拉强度262 MPa,屈服强度218 MPa,延伸率10.4%。基于实验结果分析,可发现对于经时效处理的挤压态Mg-9Sn-1.5Y-0.4Zr合金,沉淀强化是主要的强化因素(~51.76%)。
The effects of heat treatment on the microstructure and mechanical properties of extruded Mg-9Sn-1.5Y-0.4Zr magnesium alloy were investigated experimentally. The results show that heat treatment has significant effect on the microstructure and mechanical properties of Mg-9Sn-1.5Y-0.4Zr alloy. Extruded alloy mainly consists of non-uniform distribution of Mg2Sn phase. After 495 ℃, 10 h solution treatment, the majority of Mg2Sn phase into the matrix. Aging treatment can significantly improve the mechanical properties of Mg-9Sn-1.5Y-0.4Zr alloy, the best aging process: aging at 250 ℃ for 60 h. The final mechanical properties were Vickers hardness of 890 MPa, ultimate tensile strength of 262 MPa, yield strength of 218 MPa and elongation of 10.4%. Based on the experimental results, it can be found that precipitation strengthening is the main strengthening factor (~ 51.76%) for aged Mg-9Sn-1.5Y-0.4Zr alloy.