论文部分内容阅读
采用光学显微镜、拉伸试验机及显微硬度仪,研究了轧制温度对2524铝合金显微组织和力学性能的影响。结果表明:2524铝合金铸态组织中存在大量枝晶结构和成分偏析,经均匀化处理后枝晶消失,成分偏析改善。2524铝合金经大应变轧制后晶粒沿轧制方向被拉长,晶粒内部和晶界处留存大量第二相。随轧制温度降低,2524铝合金强度、硬度升高,断后伸长率先升后降。在轧制温度25℃时,抗拉强度以及硬度达到最高,分别为328 MPa和106.5 HV;在轧制温度为200℃时,伸长率达到最大值(14%)。
The effects of rolling temperature on the microstructure and mechanical properties of 2524 aluminum alloy were studied by optical microscope, tensile tester and microhardness tester. The results show that a large amount of dendritic structure and composition segregation exist in the as-cast microstructure of 2524 aluminum alloy, and the dendrite disappears and the segregation of components improves after homogenization. After rolling in 2524 aluminum alloy, the grains are elongated along the rolling direction and a large number of second phases are retained in the grain boundaries and grain boundaries. With the decrease of rolling temperature, the strength and hardness of 2524 aluminum alloy increase first and then decrease after breaking. Tensile strength and hardness reach the maximum at rolling temperature of 25 ℃, respectively, 328 MPa and 106.5 HV; at rolling temperature of 200 ℃, the elongation reaches the maximum (14%).