Effect of Ultrasonic Melt Treatment on Microstructure and Hardening of Al-Cu-Mg-Ag Alloys
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.
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