熔体-结晶相固-液界面能的研究进展
作者简介 坚增运, 男, 1962年生, 教授, 博士
收稿日期: 2018-01-02
网络出版日期: 2018-04-09
基金资助
资助项目 国家自然科学基金项目Nos.51371133和51671151
Development of Solid-Liquid Interfacial Energyof Melt-Crystal
Received date: 2018-01-02
Online published: 2018-04-09
Supported by
Supported by National Natural Science Foundation of China (Nos.51371133 and 51671151)
结晶相的凝固特性决定其凝固后的组织和性能,要对结晶相凝固特性与过程进行准确表征与有效控制,就必须知道熔体-结晶相固-液界面能的准确数据。本文结合作者长期以来对熔体-结晶相固-液界面能的研究工作,论述了熔体-结晶相固-液界面能实验测定和理论研究方面的相关进展。通过对不同温度下固-液界面能实验测定结果的分析比较,发现熔体-结晶相的固-液界面能随温度的降低而减小;找出了Spaepen固-液界面能模型与实验测定结果不相符的原因;提出基于固-液界面结构的固-液界面能理论模型及用其确定固-液界面能的方法。结果表明,当前模型对固-液界面能的预测结果不仅与熔点温度下实验值和模拟值相吻合,而且也与过冷温度下实验值和模拟值相吻合。
坚增运 , 徐涛 , 许军锋 , 朱满 , 常芳娥 . 熔体-结晶相固-液界面能的研究进展[J]. 金属学报, 2018 , 54(5) : 766 -772 . DOI: 10.11900/0412.1961.2017.00565
Solid-liquid interfacial energy (SLIE) plays a crucial role in accurately evaluating solidification characteristics and effectively tuning the solidification process of crystals, which determines the structures and properties of crystals. This paper is based on the investigations of the authors on SLIE of melt-crystal in the past decade, and concentrates on reviewing the recent developments on the experimental and theoretical results of SLIE of melt-crystal. It draws several important conclusions by comparing various experimental results of SLIE under different temperatures. Firstly, the SLIE of melt-crystal decreases with the decrease of temperature. Secondly, the reason for different SLIE respectively obtained by Spaepen model and experimental measurement is revealed. Eventually, a model and method based on the structure of the solid-liquid interface for predicting the SLIE are proposed, and the results provided by this model are in line with the experimental results and the simulated results at the melting temperature, as well as the experimental results and the simulated results of the undercooled state.
Key words： solid-liquid interface; interfacial energy; undercooling; metal; facet
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