摘要
采用内冷式搅拌法制备了A319、A356、A380、ZL203、7075等5种牌号铝合金的半固态浆料。研究了内冷搅拌速度、内冷块/铝液质量比、铝液温度对A319半固态浆料显微组织的影响。结果表明：提高内冷搅拌速度不仅能提高初生琢-Al相圆整度,还具有晶粒细化效应。在内冷块/铝液质量比为3%、铝液温度为615℃以及内冷块/铝液质量比为5%、铝液温度为615-625℃条件下均可以制备出组织良好的半固态浆料,显微组织中初生琢-Al相平均晶粒尺寸和形状因子分别可以达到61-71滋m和0.68-0.73。分析了内冷式搅拌法制备铝合金半固态浆料过程中球状晶的形核及长大过程。
The semi-solid slurry of A319, A356, A380, ZL203, 7075 aluminum alloy were prepared by the internal cooling process. The effects of the stirring speed, the mass ratio of internal cooling block to aluminum melt and the temperature of aluminum melt on microstructure of A319 semi-solid slurry were researched. The resuks indicate that the roundness of the primary particles and grain refinement effects can be increased with the increasing of stirring speed. The well globular primary α-Al was produced when the mass ratio of internal cooling block to aluminum melt was 3%, temperature of aluminum melt was 615 ℃ and the mass ratio of internal cooling block to aluminum melt was 5%, temperature of aluminum melt was 615-625 ℃, in which the average diameter and shape factor of the primary α-Al particles was 61-71 μm and 0.68-0.73 respectively. The process of nucleation and growth of the spheroidal primary α-Al during the internal cooling process were analyzed.
出处
《铸造》
CAS
CSCD
北大核心
2016年第2期141-145,150,共6页
Foundry
基金
国家国际科技合作专项(2015DFA71350)
福建省科技重大专项资助项目(2013HZ02090296)
福建省科技厅重大项目资助项目(2013H41010090)
关键词
半固态
铝合金
内冷搅拌
显微组织
semi-solid
aluminum alloy
internal cooling
microstructure
