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在不同的温度以及不同的初始含氢量下对A356铝合金熔体实施超声振动,通过定量测氢仪直接测定含氢量,研究了超声振动在制备半固态A356浆料时对熔体含气量的影响及除气效果。结果表明,对A356液相线温度(615℃)以下20℃以内的半固态浆料,超声振动具有除气作用,最大除气率达15%左右。初始含氢量低时,半固态熔体的超声除气效率降低。熔体氩气除气结合半固态超声振动除气效果最好,含氢量可降至0.12cm3/100gAl以下。对在常压下制备的液态及半固态浆料凝固试样,气缩孔率随熔体含氢量的降低而减小,试样密度随含氢量的降低而增大。
Ultrasonic vibration was applied to the A356 aluminum alloy melt at different temperatures and different initial hydrogen contents, and the hydrogen content was directly measured by a quantitative hydrogen analyzer. The effects of ultrasonic vibration on the gas content of the melt during the preparation of the semi-solid A356 slurry Effect and degassing effect. The results show that for the semi - solid slurry below 20 ℃ below the liquidus temperature of A356 (615 ℃), the ultrasonic vibration has degassing effect and the maximum outgassing rate is about 15%. When the initial hydrogen content is low, the ultrasonic degassing efficiency of the semi-solid melt decreases. Melting argon degassing combined with semi-solid ultrasonic vibration degassing best, hydrogen content can be reduced to 0.12cm3 / 100gAl below. For the liquid and semi-solid slurry prepared at atmospheric pressure, the shrinkage porosity decreases with the decrease of the hydrogen content of the melt, and the density of the sample increases with the decrease of the hydrogen content.