›› 2014, Vol. 23 ›› Issue (8): 86401-086401.doi: 10.1088/1674-1056/23/8/086401

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Decline of nucleation in the heating process with a high heating rate

杨高林, 林鑫, 宋梦华, 胡桥, 汪志太, 黄卫东   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2013-10-09 修回日期:2014-02-25 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50971102), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20116102110016), the National Basic Research Program of China (Grant No. 2011CB610402), and the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (Grant No. SKLSP201306).

Decline of nucleation in the heating process with a high heating rate

Yang Gao-Lin (杨高林), Lin Xin (林鑫), Song Meng-Hua (宋梦华), Hu Qiao (胡桥), Wang Zhi-Tai (汪志太), Huang Wei-Dong (黄卫东)   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2013-10-09 Revised:2014-02-25 Online:2014-08-15 Published:2014-08-15
  • Contact: Lin Xin E-mail:xlin@nwpu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50971102), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20116102110016), the National Basic Research Program of China (Grant No. 2011CB610402), and the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (Grant No. SKLSP201306).

PDF (PC)

508

赞

摘要： The effect of the heating rate on the nucleation of metallic glass in a rapid heating process starting from the glass transition temperature is investigated. The critical nucleus radius increases with the increase of the temperature of the undercooling liquid. If the increment rate of the critical nucleus radius, owing to the heating process, is higher than the growth rate of the nuclei, the nuclei generated at the low temperature will become the embryos at the high temperature. This means that the high heating rate can make no nucleation happen in the heating process. In consideration of the interfacial energy, the growth rate of the nuclei increases with the increase of their size and the growth rate of the critical nucleus is zero. Thus, the lower heating rate can also make the nuclei decline partially. Finally, this theory is used to analyze the nucleation process during laser remelting metallic glass.

关键词: nucleation, growth rate, heating rate, bulk metallic glass

Abstract: The effect of the heating rate on the nucleation of metallic glass in a rapid heating process starting from the glass transition temperature is investigated. The critical nucleus radius increases with the increase of the temperature of the undercooling liquid. If the increment rate of the critical nucleus radius, owing to the heating process, is higher than the growth rate of the nuclei, the nuclei generated at the low temperature will become the embryos at the high temperature. This means that the high heating rate can make no nucleation happen in the heating process. In consideration of the interfacial energy, the growth rate of the nuclei increases with the increase of their size and the growth rate of the critical nucleus is zero. Thus, the lower heating rate can also make the nuclei decline partially. Finally, this theory is used to analyze the nucleation process during laser remelting metallic glass.

Key words: nucleation, growth rate, heating rate, bulk metallic glass

中图分类号:  (Studies of nucleation in specific substances)

  • 64.60.qj
81.10.Jt (Growth from solid phases (including multiphase diffusion and recrystallization)) 81.05.Kf (Glasses (including metallic glasses))