Al-CuAl_2共晶层片间距的数值模拟  

NUMERICAL SIMULATION OF THE INTERLAMELLAR SPACING OF Al-CuAl_2 EUTECTIC

作　　者：张伟强[1] 杨院生[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所快速凝固及非平衡合金国家重点实验室,沈阳110015

出　　处：《金属学报》1998年第1期1-6,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59431010

摘　　要：本文根据层片状共晶生长理论，利用时间相关模型对存在对流作用的Al-CuAl2共晶层片间距进行数值求解最小和最大层片间距（λo和λmax）的计算结果与实验结果符合较好，熔体的流动使Al-CuAl2共晶稳态生长的层片间距增加；当层片间距超过λmax时，层片组织处于非稳态：共晶生长速率越低。In this paper, a time-dependent model of directionally solidified Al-CuAl2 eutectic system is numerically calculated according to the theory of lamellar eutectic growth. The computed minimal and maxiamal interlamellar spacings correspond well to the experimental results,the lamellar spacing increases due to melt flow in solidification, and such structure is unstable as the spacing exceeds the maximum. Moreover, the lower the growing rate, the greater the effect of fluid flow.

关 键 词：共晶 层片间距 流动 稳定性 共晶生长 铝合金 

分 类 号：TG111[金属学及工艺—物理冶金] TG146.21[金属学及工艺—金属学]