研究了功率超声作用下的纳米TiN颗粒熔体处理对A356合金微观组织的影响。结果表明：由于纳米TiN与A356合金熔体不润湿，单独加入纳米TiN，合金枝晶减少、初始晶粒细化，而共晶Si相的形貌变化不明显；向熔体中加入纳米TiN后进行功率超声处理，不但合金的初始晶粒细化、枝晶减少，而且共晶Si由长针状转变为短棒状。
Power ultrasonic vibration and nano-TiN particles were used to modify the microstructure of A356 alloy,and the effect was investigated. The results show that without ultrasonic treatment,the addition of nano-TiN refines primary aluminum, however,it has no effect on eutectic silicon phase. After ultrasonic treatment,both primary aluminum and eutectic silicon are significantly refined,and the needle-like eutectic silicon turns into rod-like during solidification process.
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