J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (03): 370-372.

• Research Articles • Previous Articles     Next Articles

Amorphous Formation in an Undercooled Binary Ni-Si Alloy under Slow Cooling Rate

Yiping Lu, Gencang Yang, Xiong Li , Yaohe Zhou   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi0an 710072, China
  • Received:2008-04-22 Revised:2009-06-02 Online:2009-05-28 Published:2009-10-10
  • Contact: LU Yi-Ping
  • Supported by:

    the National Natural Science Foundation of China (No. 50395103)
    the Doctorate Foundation of Northwestern Polytechnical University (CX200506)

Abstract:

High undercooling up to 392 K was achieved in eutectic Ni70.2Si29.8 alloy melt by using glass fluxing combined with cyclic superheating. A small quantity of amorphous phase was obtained in bulk eutectic Ni70:2Si29:8 alloy when undercooling exceeds 240 K under slow cooling conditions (about 1 K/s). The amorphous phase was
confirmed by high-resolution transmission electron microscopy and differential scanning calorimetry.

Key words: Eutectic alloy, Amorphous phase, Rapid solidification

CLC Number: