Zhang Xiaoli1 Xie Shuisheng2 Li Tingju1 Yang Haoqiang Jin Junze1. Influence of Damper-cooling on Near-liquidus Suction Casting AZ91 Alloy. [J]. Special Casting & Nonferrous Alloys (S1):130-132(2007)
Zhang Xiaoli1 Xie Shuisheng2 Li Tingju1 Yang Haoqiang Jin Junze1. Influence of Damper-cooling on Near-liquidus Suction Casting AZ91 Alloy. [J]. Special Casting & Nonferrous Alloys (S1):130-132(2007)DOI:
Influence of Damper-cooling on Near-liquidus Suction Casting AZ91 Alloy
摘要
试验研究在负压吸铸低过热度镁合金熔体工艺中
施加阻尼冷却作用对成形铸件的影响。由于阻尼冷却作用
流动的合金熔体中产生细小的初生α(Mg)相
充入型腔时以半固态浆料的形式注入
半固态浆料具有的触变性能使得流动前端以圆钝的封闭形式充型
因此得到表面质量高
内部结构密实的铸件。阻尼冷却管作用下得到的铸件微观结构由初生相和共晶混合物组成
但是析出相β-Mg17Al12的含量高于没有阻尼冷却作用下得到的铸件。
Abstract
In order to semisolid processing alloy directly from liquid metal
a damper-cooling tube was applied in near-liquidus suction casting AZ91 magnesium alloy in this investigation.Castings showed a good surface quality and integral structure in comparison with that of castings without using a damper-cooling tube.The reason for this was that semisolid slurry was produced due to damper-cooling effect
which is supported by the microstructure consisting of fine primary α-Mg particles and eutectic mixture.However
the content of precipitate phase is more than that of castings formed without a damper cooling tube.