中国物理B ›› 2009, Vol. 18 ›› Issue (5): 1917-1922.doi: 10.1088/1674-1056/18/5/032

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

赵素, 李金富, 刘礼, 周尧和   

  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 收稿日期:2008-09-24 修回日期:2008-10-16 出版日期:2009-05-20 发布日期:2009-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50571068).

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

Zhao Su(赵素), Li Jin-Fu(李金富)†, Liu Li(刘礼), and Zhou Yao-He(周尧和)   

  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2008-09-24 Revised:2008-10-16 Online:2009-05-20 Published:2009-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50571068).

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摘要： This paper investigates the solidification behaviour of the Ag--Cu eutectic alloy melt undercooled up to 100K. It is revealed that lamellar eutectics grow in a dendritic form in the Ag--Cu eutectic melt with undercooling equal to or greater than 76K. 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

Abstract: This paper investigates the solidification behaviour of the Ag--Cu eutectic alloy melt undercooled up to 100K. It is revealed that lamellar eutectics grow in a dendritic form in the Ag--Cu eutectic melt with undercooling equal to or greater than 76K. 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.

Key words: rapid solidification, undercooling, Ag--Cu eutectic alloy, anomalous eutecitcs

中图分类号:  (Solidification)

  • 81.30.Fb
64.70.D- (Solid-liquid transitions) 68.70.+w (Whiskers and dendrites (growth, structure, and nonelectronic properties))