热处理对挤压变形Mg-12Gd-3Y-0.6Zr合金力学性能及显微组织的影响
Effects of Heat Treatment on Microstructure and Mechanical Properties of Mg-12Gd-3Y-0.6Zr Alloy As-extruded
胡韶华, 陈志永, 李冰峰, 刘楚明
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作者单位：中南大学 材料科学与工程学院, 湖南 长沙 410083
中文关键字：Mg-12Gd-3Y-0.6Zr合金； 挤压； 固溶； 时效； 显微组织； 力学性能
英文关键字：Mg-12Gd-3Y-0.6Zr alloy; extrusion; solution; age; microstructure; mechanical properties
中文摘要：采用硬度检测、拉伸力学性能测试、金相、扫描及透射电镜观察等方法，研究了挤压态Mg-12Gd-3Y-0.6Zr合金经T4、T5和T6热处理后显微组织及力学性能的变化。结果表明：挤压态合金宜采用T5热处理。经T5热处理后，合金的屈服强度、抗拉强度分别达到372 、403 MPa，远高于T4、T6处理的，其原因在于T5热处理后合金中存在大量棱镜片状第二相。T6热处理时，虽然合金的时效强化效果优于T5态合金，但晶粒长大严重降低了合金的力学性能。
英文摘要：The microstructure and mechanical properties variation of Mg-12Gd-3Y-0.6Zr alloy as-extruded after T4, T5 and T6 heat treatment were studied through hardness test, tensile test and microstructure analysis. The results show that the hardness and strength of as-extruded alloy change obviously after different heat treatment. The yield strength and tensile strength for T5 treatment are 372 MPa and 403 MPa, respectively. The better mechanical properties are obtained for T5 treatment because the prismatic second phase largely exists in alloy. Although the age strengthening effect for T6 treatment is better than that for T5 treatment, the mechanical properties is decreased by the grain growth obviously.