Solidification of Al-Bi-Sn immiscible alloy under microgravity conditions of space
Solidification of Al-Bi-Sn immiscible alloy under microgravity conditions of space
复制标题
空间微重力条件下Al-Bi-Sn难混溶合金的凝固
DOI：
10.1016/j.scriptamat.2018.12.010
复制
发表时间：
2019
影响因子：
6
通讯作者：
Fei Ai
中科院分区：
文献类型：
--
作者：
Wang Li;Hongxiang Jiang;Lili Zhang;Shixin Li;Jie He;Jiuzhou Zhao;Fei Ai
Al-Bi-Sn合金在空间定向凝固。样品显示出分散良好的微观结构。建立了描述凝固过程中微观组织形成的模型。计算表明，少数相液滴（MPDs）的Stokes沉降和熔体的对流不利于凝固稳态的建立，在地面凝固开始后不久就发生了宏观偏析。微重力条件下熔体对流的减弱和mpd的Stokes运动促进了凝固稳态的建立和分散良好的微观组织的形成。
Al-Bi-Sn alloy was solidified directionally in space. The sample shows a well-dispersed microstructure. A model was developed to describe the microstructure formation during solidification. Calculations demonstrate that the Stokes settlement of the Minority Phase Droplets (MPDs) and the convection of the melt are against the establishment of the steady state of solidification and macro-segregation occurs soon after the beginning of the solidification on ground. The diminished melt convection and the Stokes motions of the MPDs under microgravity conditions promote the establishment of the steady state of solidification and the formation of a well-dispersed microstructure.