Al-Cu-Mg-Ag alloy melt was treated with ultrasonic waves,and the effect of the ultrasonic melt treatment on the microstructure and hardness of alloy was investigated.The results show that compared to the as-cast alloy without ultrasonic treatment,the as-cast alloy after ultrasonic melt treatment for 90 s and 180 s respectively has its hardness correspondingly improved by 12.7%and 11.2%.The ultrasonic melt treatment can reduce the segregation of alloy composition and accelerate precipitation of Ω phase during 2 h aging process at 200℃.A quantitative analysis shows that ultrasonic melt treatment can reduce the grain size of as-cast alloy,but presents limited effect of fine grain strengthening.Solid solution strengthening and precipitation strengthening respectively improve the hardness of as-cast and T6-tempered alloys.
维普
万方数据