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在Mg-8Li-3Al合金的凝固过程中,不同功率的超声波被引入到合金熔体中。在超声作用下研究Mg-8Li-3Al合金的微观结构、耐腐蚀性能和力学性能。基于超声空化作用及声流作用,对超声细化机制进行分析。结果表明:在施加超声波后,合金的α相形貌从粗大的蔷薇状结构变为细小的近球状结构。当超声波功率为170W时,能够获得细小的球状结构。与没有施加超声场的合金相比,施加超声场(功率170W,作用时间90s)后的合金耐腐蚀性明显提高,力学性能也有很大改善,抗拉强度和伸长率分别提高了9.5%和45.7%。
In the solidification of Mg-8Li-3Al alloy, different power ultrasonic waves are introduced into the alloy melt. Under the action of ultrasound, the microstructure, corrosion resistance and mechanical properties of Mg-8Li-3Al alloy were studied. Ultrasonic refining mechanism was analyzed based on ultrasonic cavitation and acoustic flow. The results show that the α-phase morphology of the alloy changes from coarse rose-like structure to fine near-spherical structure after applying ultrasonic wave. When the ultrasonic power is 170W, a fine spherical structure can be obtained. Compared with the alloy without ultrasonic field, the corrosion resistance of the alloy after ultrasonic field (power 170W, action time 90s) is obviously improved, the mechanical properties are greatly improved, the tensile strength and elongation are increased by 9.5% and 45.7 %.