非规则共晶定向凝固结构的标度律  

SCALING LAW OF IRREGULAR EUTECTIC IN DIRECTIONAL SOLIDIFICATION

作　　者：刘俊明[1] 刘治国[2] 吴状春[2] 

机构地区：[1]南京大学固体微结构物理国家实验室,讲师南京210008 [2]南京大学

出　　处：《金属学报》1993年第3期A107-A114,共8页Acta Metallurgica Sinica

摘　　要：数值求解了Al-Si共晶定向凝固耦合方程,讨论了凝固界面形态作为共晶相间距函数的变化规律共晶凝固界面临界分叉态对应于边缘稳定点和界面位置的极大值点。α-液相界面临界分叉是局域规则层状结构相间距选择点。The profile features of solidifying interface of irregular Al-Si eutectic duringdirectional solidification were studied by solving a nonlinear coupling equation of directionalsolidification of Ai-Si eutectic. The critical splitting point of the solidifying interface coin- cides with the maximum value of its position and corresponds to the marginal stability point.Argument is presented that the interlamellar spacing for local regular structure selects the crit-ical splitting state of α(Al)-liquid interface as its operating point, and the operating point ofaverage interflake spacing for irregular structure is the critical splitting state of β(Si)-liquidinterface. The scaling laws derived, which have more general forms than the classicJackson-Hunt scaling, gained support from the experimental results.

关 键 词：非规则共晶 定向凝固 标度律 

分 类 号：TG111.4[金属学及工艺—物理冶金]