上海大学学报(自然科学版) ›› 2015, Vol. 21 ›› Issue (1): 1-11.doi: 10.3969/j.issn.1007-2861.2014.04.014

• 冶金材料 •    下一篇

金属熔体本征过冷度与熔化熵的耦合关系

李晨辉, 徐明沁, 韩秀君, 李建国   

  1. 上海交通大学 材料科学与工程学院先进材料凝固实验室, 上海 200240
  • 收稿日期:2015-01-05 出版日期:2015-02-28 发布日期:2015-02-28
  • 通讯作者: 李建国(1958—), 男, 教授, 博士生导师, 博士, 研究方向为金属凝固原理及其应用. E-mail:lijg@sjtu.edu.cn
  • 基金资助:

    国家重点基础研究发展计划(973计划)资助项目(2011CB012900)

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

摘要: 利用气动悬浮和熔融玻璃净化法对液态纯铁的过冷能力进行研究, 分别获得了340 和281K 的最大过冷度, 表明在气动悬浮无容器凝固条件下液态纯铁的形核更接近于均质形核.根据经典形核理论和Spaepen 界面能公式, 建立了金属熔体本征过冷度(即均质形核对应的过冷度)与熔化熵之间的耦合关系方程. 并根据该方程预测了一系列金属熔体的本征过冷度, 对比结果表明预测值与实验值具有较好的一致性.

关键词: 过冷能力, 金属熔体, 热物性参数, 液固界面能

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

中图分类号: