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采用一种新型的间接超声振动装置制备5052铝合金半同态浆料,研究了启振温度和振动时间对浆料组织的影响.结果表明,在液相线温度643℃及以上开始对5052铝合金熔体进行50 s的间接超声处理,能获得晶粒细小圆整的半固态浆料.在液相线温度开始通过杯底对合金熔体进行间接超声处理,可在杯底附近大量形核,随后初生晶粒以球状方式生长;在60 s的制浆时间内,晶粒平均直径先减小后增大,平均形状系数则一直增大.熔体温度降至液相线以下3℃时再进行间接超声处理,亦能破碎发达的枝晶获得蔷薇状组织和球状晶粒共存的半固态浆料,晶粒平均直径为105μm.
A new type of indirect ultrasonic vibration device was used to prepare semi-homogenous slurry of 5052 aluminum alloy, and the influence of activation temperature and vibration time on the microstructure of the slurry was investigated. The results show that 5052 aluminum The alloy melt was subjected to indirect sonicating for 50 s to obtain a semicircle slurry with fine grains.It was found that when the liquidus temperature started to pass through the bottom of the cup, the alloy melt was indirectly sonicated, , Followed by the growth of primary grains in a spherical manner; the average grain diameter first decreased and then increased while the average shape coefficient increased at 60 s, and the melt temperature dropped to 3 ° C below the liquidus Further indirect sonicating can also break the developed dendrites to obtain a semi-solid slurry in which rose-like tissue coexists with spherical grains with an average grain diameter of 105 μm.