Formation mechanism of anomalous eutectics in highly undercooled Ag-39.9 at%Cu alloys  

作　　者：赵素 李金富 刘礼 周尧和 

机构地区：[1]State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University

出　　处：《Chinese Physics B》2009年第5期1917-1922,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No 50571068)

摘　　要：This paper investigates the solidification behaviour of the Ag-Cu eutectic alloy melt undercooled up to 100 K. It is revealed that lamellar eutectics grow in a dendritic form in the Ag-Cu eutectic melt with undercooling equal to or greater than 76 K. As undercooling increases, the remelted fraction of the primary eutectics during recalescence rises. The severe remelting and the subsequent ripening of the primary eutectic dendrites lead to the formation of anomalous eutectics.This paper investigates the solidification behaviour of the Ag-Cu eutectic alloy melt undercooled up to 100 K. It is revealed that lamellar eutectics grow in a dendritic form in the Ag-Cu eutectic melt with undercooling equal to or greater than 76 K. As undercooling increases, the remelted fraction of the primary eutectics during recalescence rises. The severe remelting and the subsequent ripening of the primary eutectic dendrites lead to the formation of anomalous eutectics.

关 键 词：rapid solidification UNDERCOOLING Ag-Cu eutectic alloy anomalous eutecitcs 

分 类 号：TG131[一般工业技术—材料科学与工程]