试样盒厚度和超声振动对共晶生长的影响

摘要

采用实时观测装置和定向凝固系统研究了SCN-Cam(Succinonitrile-wt%Camphor,wt%为质量分数)模拟合金的共晶生长过程。实验结果表明, SCN-23.6% Cam共晶模拟合金所形成的棒状共晶的相间距λ随着界面推移速度V 的增大而减小,与J-H模型吻合得较好；随着试样盒厚度的增加,SCN-23.6% Cam模拟合金的棒状共晶相间距增大；施加超声振动时,SCN-Cam模拟合金相图的共晶成分点向SCN方向移动,α单相区和(L+α)两相区减小,共晶线温度升高。%The eutectic growth process of SCN-Cam (Succinonitrile-wt%camphor,wt% was as mass fraction) model alloy was studied with real-time observation devices and directional solidification system.It was indicated that the rod-like eutectic phase spacings of the SCN-23.6%Cam eutectic model alloy decrease with the increase of interface moving rates which was coincided with J-H model′s;with the increase of sample cell thicknesses, rod-like eutectic phase spacings of SCN-23.6%Cam model alloy increase;under the ultrasonic vibration condi-tion,the eutectic composition point of the SCN-Cam model alloy phase diagram moves to SCN direction,the ranges ofαphase and L+αphase decrease,and the eutectic temperature increases.