Effect of liquid-liquid structure transition on solidification of Sn-Bi alloys  

作　　者：祖方遒 周兵 李先芬 益汛 陈轶平 孙其强 

机构地区：[1]College of Materials Science and Engineering, Hef ei University of Technology

出　　处：《中国有色金属学会会刊：英文版》2007年第5期893-897,共5页Transactions of Nonferrous Metals Society of China

基　　金：Projects(50571533, 50371024) supported by the National Natural Science Foundation of China;Project(104106) supported by Chinese Ministry of Euducation

摘　　要：The effect of the liquid-liquid structure transition(L-LST) on the solidification behaviors and morphologies of Sn-Bi alloys was studied further. The results show that the undercooling of the primary and eutectic phase increases and the microstructure becomes finer after solidifying from the melt experiencing the L-LST. In the meantime, in hypoeutectic alloy, when solidifying from the melt experiencing the L-LST, the morphology of primary phase changes from the fir-tree crystal into the equiaxed crystal, and less primary phase and more eutectic structure are observed. Moreover, in eutectic alloy, the spacing of eutectic phase decreases markedly. These investigations would be beneficial to further exploration of the correlation between the melt structure and the micro mechanism of solidification.The effect of the liquid-liquid structure transition（L-LST） on the solidification behaviors and morphologies of Sn-Bi alloys was studied further. The results show that the undercooling of the primary and eutectic phase increases and the microstructure becomes finer after solidifying from the melt experiencing the L-LST. In the meantime, in hypoeutectic alloy, when solidifying from the melt experiencing the L-LST, the morphology of primary phase changes from the fir-tree crystal into the equiaxed crystal, and less primary phase and more eutectic structure are observed. Moreover, in eutectic alloy, the spacing of eutectic phase decreases markedly. These investigations would be beneficial to further exploration of the correlation between the melt structure and the micro mechanism of solidification.

关 键 词：液体结构 过冷现象 凝固结构 SN-BI合金 

分 类 号：TG111.4[金属学及工艺—物理冶金]