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以超声波输出功率密度、处理时间、熔体施振温度和铸型预热温度为研究因素,对LC9合金熔体施加低功率超声振动进行了试验研究。结果表明,通过控制低功率超声熔体处理参数与凝固条件,可以制备出初生相为球状或细小颗粒状晶体的LC9合金;功率密度在0～5W/cm2范围内,随着功率密度的增大,初生晶粒逐渐细化,但功率密度大于5W/cm2后,初生晶粒大小不再发生明显变化;随着搅拌时间的增加或施振温度的提高,初生晶粒尺寸先减小后增大,其转折点分别为45s和660℃;在室温～450℃的范围内,随着铸型预热温度的增加,晶粒尺寸迅速增大,当预热温度高于300℃时,超声波所起的晶粒球化效果被削弱。
Taking ultrasonic output power density, processing time, the temperature of the melt and the preheating temperature of the mold as the researching factors, low power ultrasonic vibration was applied to the melt of the LC9 alloy. The results show that the LC9 alloy with spherical or fine granular crystals as the primary phase can be prepared by controlling the processing parameters and the solidification conditions of the low-power ultrasonic melt. The power density is within the range of 0-5 W / cm2. With the increase of the power density , The size of primary grains gradually refined, but the primary grain size no longer changed obviously when the power density was more than 5W / cm2. With the increase of stirring time or the increase of temperature, the size of primary grains decreased and then increased , The turning points were 45s and 660 ℃, respectively. From room temperature to 450 ℃, the grain size increased rapidly with the increase of preheating temperature. When the preheating temperature was higher than 300 ℃, Grain ball effect is weakened.