通过在 70 5 5铝合金熔体浇注前作超声处理 ,超声波在熔体中产生空化作用 ,活化了熔体中微小的杂质粒子 (主要是Al2 O3 ) ,使其成为结晶核心 ,从而促进了形核 ,因此能细化晶粒 ,并得到较高抗拉强度和塑性的铸锭。研究超声作用对其显微组织和力学性能的影响。结果表明 :对 70 5 5铝合金熔体作用超声能细化晶粒和均匀化组织 ,提高其抗拉强度 ,并能大幅度提高其塑性 By sonicating 70? 5 aluminum alloy melt prior to casting, the ultrasonic wave generates cavitation in the melt, activating the tiny impurity particles (mainly Al? O?) In the melt to become crystalline nuclei, thereby promoting the formation of The nucleus, therefore, can refine the grains and result in ingots of higher tensile strength and ductility. The effect of ultrasound on the microstructure and mechanical properties was studied. The results show that the ultrasonic treatment of 70 5 5 aluminum alloy can refine the grains and homogenize the microstructure, increase the tensile strength and improve the ductility