超声处理对SiC_P/AZ91D复合材料凝固组织的影响

Effect of Ultrasonic Treatment on Solidification Structure of SiC_P/AZ91D Composite

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 different ultrasonic power, treating time and pouring temperature on the solidification microstructure of Si CP/AZ91 D composite were investigated. The results show that the distribution of Si C particle in AZ91 D alloy can be improved effectively by controlling parameters of ultrasonic and pouring temperature. With the increase of ultrasonic power in the range of 0-900 W, Si C particles are spreaded evenly in the matrix. With the increase of treating time for0-60 s, Si C particles spread evenly. When the treating time is over 90 s, the particles reunite again. With the decrease of pouring temperature at 640-730 ℃, Si C particles evenly distribute gradually under the condition of ultrasonic treatment.