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利用光学显微镜、扫描电镜及力学性能测试等分析手段研究了不同热处理条件对Mg-5Gd-0.5Sc-Mn合金的微观组织和力学性能的影响。结果表明,Mg-5Gd-0.5Sc-Mn合金具有良好的室温性能及高温稳定性。比较T5和T6两种热处理工艺发现:挤压态合金在200℃经过不同时间的时效,T5态较T6态的峰值时效硬度高,且T5态到达峰值时效的时间比T6态的短;合金T5态的室温抗拉强度可以达到216MPa,200℃达到191MPa,均高于T6态的191和186MPa;T5态室温及高温条件下的断裂模式表现为准解理及微孔聚集的塑性断裂,而T6态室温及高温条件下分别为解理和准解理的脆性断裂。
The effects of different heat treatment conditions on microstructure and mechanical properties of Mg-5Gd-0.5Sc-Mn alloy were studied by means of optical microscope, scanning electron microscopy and mechanical properties test. The results show that, Mg-5Gd-0.5Sc-Mn alloy has good room temperature properties and high temperature stability. Comparing T5 and T6 two kinds of heat treatment process found: extrusion alloy at 200 ℃ after aging at different times, T5 state than T6 state peak aging hardness, and T5 state peak time of aging than the T6 state short; alloy T5 Tensile strength can reach 216MPa at room temperature and 191MPa at 200 ℃, both of which are higher than 191 and 186MPa at T6 state. The fracture modes of T5 state at room temperature and high temperature are plastic fracture with quasi-cleavage and micropore aggregation, while T6 Under the condition of room temperature and high temperature, they are cleavage and quasi-cleavage.