摘要
在定向凝固下计算和比较了Cu-1.0%Cr亚共晶合金组织中各相的界面生长温度,结果表明当定向凝固速率大于5μm/s时,α-Cu相的界面生长温度高于共晶组织,α-Cu相会作为初生相首先析出凝固,从而难以制备出全耦合生长的共晶组织的复合材料,计算获得的结果与实验结果相一致。另外随定向凝固速率的增加,初生胞状α-Cu相一次枝晶间距和尖端半径以及共晶组织的体积分数都相应地减少,其中α-Cu相一次枝晶间距实验结果与KF一次枝晶间距模型计算结果较为接近。
Directionally solidified microstructures were investigated based on the calculation and comparison of interface growth temperatures of different phases in Cu-1.0% Cr hypoeutectic alloy at various growth velocities.The results show that the entirely coupled eutectics could not be obtained at the growth rate higher than 5μm/s and the α-Cu phase will be the primary phase solidified ahead of the coupled eutectics,which agrees with the experiment results.In addition,the primary dendritic arm spacing,dendritic ra...
出处
《航空材料学报》
EI
CAS
CSCD
2008年第5期1-5,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金项目(批准号:50432020)
关键词
定向凝固
CU-CR合金
微观组织
一次枝晶间距
directional solidification
Cu-1.0% Cr hypoeutectic alloy
microstructure
primary dendritic arm spacing
