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研究了不同温度条件下的Al-Cu-Mn合金力学性能,并采用金相、SEM、EDS手段分析了不同温度下试样的微观组织。研究结果表明:随着温度的升高,合金抗拉强度从468MPa降到395MPa,而伸长率也从2.8%降到1.5%。通过合金的金相可知,合金力学性能的降低是高温第二相质点发生偏聚导致的。结合SEM、EDS测试,结果表明,合金在高温产生了短暂的过时效,影响了第二相质点的凝聚状态。同时拉伸温度对试样断裂形式也有明显影响,断口主要呈现沿晶断裂,而在常温拉伸时,断裂形式以穿晶断裂为主。
The mechanical properties of Al-Cu-Mn alloys at different temperatures were studied. The microstructure of Al-Cu-Mn alloys was analyzed by metallography, SEM and EDS. The results show that as the temperature increases, the tensile strength of the alloy decreases from 468MPa to 395MPa, while the elongation decreases from 2.8% to 1.5%. Through the alloy’s metallographic shows that the reduction of mechanical properties of the alloy is the second phase of high temperature segregation caused by the second phase. Combined with SEM and EDS tests, the results show that the alloy has a short overage effect at high temperature, which affects the agglomeration state of the second phase particles. At the same time, the stretching temperature also has a significant effect on the fracture form of the specimen. The fracture mainly presents the intergranular fracture, while at normal temperature, the fracture mainly transgranular fracture.