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研究了超声功率、超声处理时间及浇注温度对Si CP/AZ91D复合材料凝固组织的影响。结果表明:通过控制超声参数和浇注温度,可有效改变Si C颗粒在合金中的分布。在0~900W内,随超声功率增加,Si C颗粒在基体中分布逐渐均匀。在0~60s内,随处理时间的增加,Si C颗粒逐渐分散均匀;当处理时间超过90s时,随处理时间增加,Si C颗粒有所团聚。在640~730℃,在超声处理条件下,随浇注温度降低,Si C颗粒逐渐分散均匀。
The effects of ultrasonic power, ultrasonic treatment time and pouring temperature on the microstructure of Si CP / AZ91D composites were studied. The results show that the distribution of Si C particles in the alloy can be effectively changed by controlling the ultrasonic parameters and the pouring temperature. In 0 ~ 900W, with the increase of ultrasonic power, Si C particles distribute evenly in the matrix. Within 0 ~ 60s, Si C particles gradually dispersed with the increase of treatment time. When the treatment time exceeded 90s, Si C particles reunited with the increase of treatment time. At 640 ~ 730 ℃, under the condition of ultrasonic treatment, Si C particles gradually dispersed with the decrease of pouring temperature.