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介绍了一种实验室自主研发的轻合金半固态浆料制备设备——锥桶式流变成形机(TBR),该设备利用刻有凸纹和沟槽的内、外锥桶的相对转动,使合金熔体在凝固过程中受到剧烈的剪切搅拌,从而获得合金半固态浆料.对TBR工艺的传热模型进行了推导,以A356为实验材料得出制备的A356铝合金半固态浆料温度与浇注温度的关系式,同时分析了不同浇注温度下合金熔体的冷却规律和获得的半固态组织形貌.结果表明,适当降低A356合金熔体的浇注温度可以延长初生固相受到的剪切时间和增加剪切次数,从而获得细小、均匀的半固态组织.当浇注温度为640℃时,初生固相平均晶粒尺寸为68μm,形状因子为0.82.
This paper introduces a kind of lab-developed light alloy semi-solid slurry preparation equipment (TBR), which is developed by laboratory. The equipment utilizes the relative rotation of the inner and outer conical buckets , So that the alloy melt subjected to intense shear agitation in the solidification process to obtain the alloy semi-solid slurry.The heat transfer model of the TBR process was deduced to A356 experimental material obtained A356 aluminum alloy semi-solid slurry The relationship between the temperature and the pouring temperature and the cooling rules of the alloy melt at different pouring temperatures and the obtained semi-solid morphology were also studied.The results show that proper reduction of the pouring temperature of the A356 alloy melt can prolong the primary solid phase The shear time and the number of shearing increase, so as to obtain fine and uniform semi-solid microstructure.When the pouring temperature is 640 ℃, the average grain size of the primary solid phase is 68μm and the shape factor is 0.82.