电脉冲孕育处理对Al-5%Cu-0.8%Mn合金组织及性能的影响

Effect of electric pulse modification on the structure and mechanical properties of Al-5%Cu-0.8%Mn alloy

摘要: 通过凝固组织观察、力学性能测试、断口分析等实验,研究了不同电脉冲孕育处理对Al-5%Cu-0.8%Mn合金组织和性能的影响.实验结果表明,不同电脉冲处理参数均使Al-5%Cu-0.8%Mn合金凝固组织细化,单位面积晶粒数提高2倍以上;合金力学性能较未处理试样明显改善,抗拉强度增加了21%~35%,伸长率提高1.8~2.5倍;且当脉冲电压500V、时间30s、频率3Hz时,合金的凝固组织细化效果最好,力学性能最佳.

Abstract: The structure and mechanical properties of the Al-5% Cu-0.8% Mn alloy conducted by electric pulse modification (EPM) at different parameters were studied by using mechanical testing and fracture analysis. The result shows that all of the specimens treated with EPM exhibit finer microstructure and good mechanical properties. Comparing with the specimens without EPM, the grain numbers per unit area increase more than two times, the tensile strength and elongation increase by 21%-35% and 1.8-2.5 times, respectively, when the pulse parameters are the voltage of 500 V, the time of 30 s and the frequency of 3 Hz.