Journal of Shanghai University(Natural Science Edition) ›› 2015, Vol. 21 ›› Issue (1): 1-11.doi: 10.3969/j.issn.1007-2861.2014.04.014

• Metallurgical Materials •     Next Articles

Correlations between molar fusion entropy and the intrinsic undercoolability of liquid metals

LI Chen-hui, XU Ming-qin, HAN Xiu-jun, LI Jian-guo   

  1. Laboratory of Advanced Materials Solidification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2015-01-05 Online:2015-02-28 Published:2015-02-28

Abstract: High undercoolings up to 340 K and 281 K for pure liquid iron are achieved using aerodynamic containerless levitation and a glass fluxing method, respectively. This implies that the nucleation of liquid iron under aerodynamic containerless solidification condition is closer to homogeneous nucleation. Based on the classical nucleation theory and Spaepen’s expression for solid/liquid interfacial energy, a correlation equation between intrinsic undercooling, namely, the undercooling corresponding to homogeneous nucleation and molar entropy is derived. From this equation, intrinsic undercoolings for a series of liquid metals can be predicted. Good agreement exists between the predicted and experimental results.

Key words: liquid metal, liquid/solid interface energy, thermophysical parameters, undercoolability

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