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采用金相显微镜、TEM及Gleeble-3500热模拟机,研究经固溶处理后的铸态AM60镁合金在不同时效压力下微观组织及力学性能的变化规律。结果表明,相比常压时效,高压时效处理可使合金晶粒细化,促进β(Mg17Al12)相析出;随着时效处理压力的提高,合金的抗压强度先升高后降低,总体而言高压时效的抗压强度高于常压时效;合金最大塑性应变随着时效处理压力的升高先降低后升高,但高压时效的最大塑性应变总体低于常压时。
The changes of microstructure and mechanical properties of as-cast AM60 magnesium alloy under different aging pressures were studied by using optical microscope, TEM and Gleeble-3500 thermal simulator. The results show that, compared with normal aging, high pressure aging can refine the grain size and promote the precipitation of β (Mg17Al12) phase. With the increase of aging treatment pressure, the compressive strength of the alloy first increases and then decreases. Generally speaking, The compressive strength of high-pressure aging is higher than that of atmospheric aging. The maximum plastic strain of alloy first decreases and then increases with the increase of aging treatment pressure, but the maximum plastic strain of high-pressure aging is lower than atmospheric pressure.