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研究了固溶温度、时效时间、时效温度对Al-Cu-Mn铸造铝合金微观组织和力学性能的影响。结果表明,合金经过530℃×14 h固溶处理后,晶界残留相最少;时效温度为170℃时,合金的硬度(HBW)随时效时间延长先增大后减小,在6h时达到峰值(145);在不同温度下时效6 h后,合金的抗拉强度、硬度(HBW)随时效温度的上升先增大后减小,均在170℃时达到峰值,为480 MPa和145,伸长率随时效温度的升高而迅速下降。
The effects of solution temperature, aging time and aging temperature on the microstructure and mechanical properties of Al-Cu-Mn cast aluminum alloy were studied. The results show that the alloy possesses the least amount of residual phases at 530 ℃ for 14 h. The hardness of the alloy (HBW) increases first and then decreases with the aging time at 170 ℃, reaching the peak at 6h (145). After aging at different temperatures for 6 h, the tensile strength and hardness (HBW) of alloys increased first and then decreased with aging temperature, both reaching peak values of 480 MPa and 145 at 170 ℃ The growth rate decreases rapidly with the aging temperature.