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利用纯镁、锡粒、纯锌和AZ31合金制备Mg-5Sn-3Al-2Zn合金,对铸态合金进行正挤压,通过金相观察、硬度测试以及拉伸实验分别研究其微观组织及力学性能。结果表明:在正挤压过程中,合金会沿着原始晶粒边界发生再结晶,并形成等轴晶粒。未再结晶的晶粒以板状形式沿挤压方向分布,边界呈锯齿状。正挤压后的合金在固溶强化、弥散强化和细晶强化的作用下,力学性能得到显著提高。
Mg-5Sn-3Al-2Zn alloy was prepared by using pure magnesium, tin particles, pure zinc and AZ31 alloy. The as-cast alloy was subjected to positive extrusion. The microstructure and mechanical properties of the as-cast alloy were investigated by metallographic observation, hardness test and tensile test . The results show that during the normal extrusion process, the alloy recrystallizes along the original grain boundaries and forms equiaxed grains. The non-recrystallized grains are distributed in the shape of a plate along the extrusion direction with jagged edges. The mechanical properties of the extruded alloy are significantly improved under solid solution strengthening, dispersion strengthening and fine grain strengthening.