预时效温度对2519铝合金力学性能和电导率的影响

Effect of pre-ageing temperature on mechanical properties and electrical conductivity of 2519 aluminum alloy

通过显微硬度测试、电导率测试、拉伸力学性能测试以及透射电镜观察等研究预时效温度对2519铝合金力学性能和电导率的影响。结果表明:随着预时效温度的升高,2519铝合金到达峰值时效的时间缩短,峰值硬度降低;经135℃预时效的合金具有较大的抗拉强度和屈服强度,其强度分别为490和442MPa,但其伸长率仅为7.0%;经165℃预时效的合金具有较好的综合力学性能,其中抗拉强度、屈服强度和伸长率分别为480MPa、435MPa和10.5%;当预时效温度大于165℃时,合金电导率随预时效温度的升高而升高;当预时效温度小于165℃时,合金电导率随温度的升高逐渐降低。

The effect of pre-ageing on the mechanical properties and electrical conductivity of 2519 aluminum alloy were investigated by microhardness test, electrical conductivity test, tensile test and transmission electron microscopy. The results show that the peak-ageing time shortens with the increase of pre-ageing temperature, and the peak hardness reduces. The alloy has the higher tensile and yield strength, which are 490 and 442 MPa, respectively, and the elongation is 7.0%. When the pre-aging temperature is 135℃, the alloy has the better combination of strength and ductility of the mechanical properties, tensile strength, yield strength and elongation are 480 MPa, 435 MPa and 10.5%, respectively when the pre-aging temperature is 165 ℃. When the pre-aging temperature is higher than 165℃, the electrical conductivity of the alloys increases with the increase of the pre-aging temperature. When the pre-aging temperature is less than 165 ℃, the electrical conductivity increases with the decrease of pre-aging temperature.