摘要
采用蛇形管浇注法制备了半固态A356铝合金浆料。结果表明：当浇注温度为660-680℃时，采用蛇形管可以制备出半固态A356铝合金组织，且管道内没有出现凝固壳：蛇形管通道的直管段长度对半固态浆料组织有较大影响，即直管段长度变短后，浆料组织变差，且制备合适半固态浆料组织的浇注温度也降低；沿径向浆料组织的形貌分布不同，由心部的球状初生α相向过渡区域的球状和蔷薇状初生α相的混合组织转变，边缘部位为蔷薇状的初生α相组织。
The semi-solid feedstock of A356 aluminum alloy was prepared through a serpentine pouring channel. The results indicate that favorable the microstructures of semi-solid A356 aluminum alloy can be generated by a serpentine pouring channel and the solid shell inside the channel can be avoided when the pouring temperature is in the range between 660 ℃ and 680 ℃. The length of the vertical section of the serpentine pouring channel has a significant influence on the microstructures of the feedstock, namely the microstructures of the feedstock become worse when the length of the vertical section is shortened, moreover, the pouring temperature for obtaining the feedstock with suitable microstructure decreases. And some changes occur across the radial microstructures, that is, the spherical grains at the centre transfer to a mixture of spherical and rosette-like grains at the transitional region, then to full rosettes at the edge.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第5期869-873,共5页
The Chinese Journal of Nonferrous Metals
基金
国家高新技术研究发展计划资助项目(2006AA03Z115)
国家重点基础研究发展计划资助项目(2006CB605203)
国家自然科学基金资助项目(50774007)
关键词
A356铝合金
半固态浆料
蛇形管
初生Α相
A356 aluminum alloy
semi-solid feedstock
serpentine pouring channel
primary a phase
