Effect of electric pulse modification on the structure and mechanical properties of Al-5%Cu-0.8%Mn alloy
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摘要: 通過凝固組織觀察、力學性能測試、斷口分析等實驗,研究了不同電脈沖孕育處理對Al-5%Cu-0.8%Mn合金組織和性能的影響.實驗結果表明,不同電脈沖處理參數均使Al-5%Cu-0.8%Mn合金凝固組織細化,單位面積晶粒數提高2倍以上;合金力學性能較未處理試樣明顯改善,抗拉強度增加了21%~35%,伸長率提高1.8~2.5倍;且當脈沖電壓500V、時間30s、頻率3Hz時,合金的凝固組織細化效果最好,力學性能最佳.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.
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