超声施振温度对A357合金二次枝晶臂间距的影响

Effects of Ultrasonic Vibration Temperature on Secondary Dendrite Arm Spacing of A357 Alloy

通过测量和分析了不同超声施振温度下A357合金的二次枝晶臂间距,研究了超声施振温度对A357合金二次枝晶臂间距影响的规律,建立了A357合金二次枝晶臂间距与超声施振温度和试样直径的关系。研究结果表明,超声施振温度对A357合金的二次枝晶臂间距影响显著,在相同的施振温度下,随着试样直径的增大,A357合金的二次枝晶臂间距增大;对于同一直径下的试样,随着超声施振温度的增加,铝合金二次枝晶臂间距先增大再减小最后又增大;超声施振温度大于700℃时,超声施振温度对试样的二次枝晶臂间距的影响较大,超声施振温度小于700℃时,试样直径对二次枝晶臂间距的影响较大。

The effects of ultrasonic vibration temperature on the secondary dendrite arm spacing ofA357 alloy were studied through testing and analyzing secondary dendrite arm spacing （SDAS） subjected to different temperature in ultrasonic vibration. Meanwhile, the relationships among the secondary dendrite arm spacing of A357 alloy and ultrasonic vibration temperature and diameter were established. The results indicate that the effects of ultrasonic vibration temperature on secondary dendrite arm spacing ofA357 alloy are obvious. Under the same ultrasonic vibration temperature, the secondary dendrite arm spacing of aluminum alloy increases with the increment of diameter. For the samples with the same diameter, with the increase of ultrasonic vibration temperature, the secondary dendrite arm spacing of A357 alloy first is increased and then decreased and last increased. When the ultrasonic vibration temperature is more than 700 ℃ the effect of the ultrasonic vibration temperature on the secondary dendrite arm spacing is obvious. When the ultrasonic vibration temperature is less than 700 ℃, the effect of diameter on secondary dendrite arm spacing is obvious.