摘要
利用高温度梯度定向凝固装置对Sn-16wt.%Sb过包晶合金进行了试验研究,考察了不同凝固速度条件下获得的凝固组织、相的形貌及初生相体积分数的变化。结果表明,定向凝固组织为硬质初生金属间化合物SnSb相弥散分布于包晶β(Sn)相的软基体中,SnSb相呈四方形或三角形状,呈现小平面相生长形态。同时发现初生相随定向凝固速率增大而细化,分布更加均匀,其体积分数随定向凝固速率的增大先减小后增大。
Directional solidified microstructures of Sn-16% Sb hyperperitectic alloy have been investigated at various solidification rates using a high-thermal gradient directional solidification apparatus. The results indicate that the solidification microstructures consist of hard primary intermetallic SnSb phase embedded in a matrix of soft peritectic β-Sn phase. The primary SnSb phase exhibits the faceted growth with the tetragonal or trigonal shapes. At the same time, the primary SnSb phase is refined with the increase of the solidification rate and dispersed more uniformly in the matrix of β-Sn phase. The volume fraction of SnSb phase firstly decrease and then increase, when the solidification rate increases in directional solidification of Sn-16% Sb hyperperitectic alloy.
出处
《铸造》
CAS
CSCD
北大核心
2008年第5期446-450,共5页
Foundry
基金
国家自然科学基金资助项目(50395100)
关键词
Sn-16%Sb包晶合金
定向凝固
初生相
形态尺度
体积分数
Sn-16%Sb hyperperitectic alloy
directional solidification
primary phase
morphological size： volume fraction
