位错的统计力学以及位错引起晶体的熔化理论  

Dislocation Mediated Melting Theory Based on the Statistical Mechanics of Dislocations

作　　者：张晓燕[1] 陈湘香[1,2] 刘克家[2] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550003 [2]上海应用技术学院材料工程学院,上海200235

出　　处：《上海应用技术学院学报（自然科学版）》2010年第2期92-96,共5页Journal of Shanghai Institute of Technology: Natural Science

摘　　要：在位错对详细讨论的基础上建立一个晶体熔化的理论模型。该理论预测一级相变并得出晶体熔化温度的上限。引起面心立方结构和体心立方结构熔化的位错类型是不同的,前者是偏位错引起,后者是全位错引起。计算出22种立方晶体的熔化温度接近实验得出的熔化温度。提出了偏位错熔化温度低,这应当是面心立方比体心立方熔化温度低的原因之一。A theoretical model for crystal melting based on the dislocation pairs is discussed in detail. The theory predicts a first-order melting transition, and the upper limit of the melting temperature is obtained. The types of dislocation mediated melting for fcc structure is different from that of the bcc one, the former mediated by the partial dislocation and the latter by the perfect one. Calculated transi- tion temperatures, Tc, for twenty-two cubic metals are close to the experimentally determined melting temperatures. As the partial dislocation mediating the lower melting point, it may give the reason of why the bcc structure is more stable than the fcc one at high temperature.

关 键 词：熔化理论 位错 统计力学 

分 类 号：O469[理学—凝聚态物理]