金属熔体原子团簇的微观热收缩机制探讨

Mechanism of Micro-Thermal Contraction of Atom Clusters in Metal Melts

摘要:

以多种纯金属及合金的X射线衍射实验结果为基础，结合理论分析，从自由体积的角度探讨金属熔体原子团簇的微观热收缩现象，进一步揭示微观热收缩的本质及机制：熔体中原子团簇的微观热收缩，是熔体中自由体积膨胀较之宏观体积膨胀更为严重的结果，团簇结构的变化是导致其出现热收缩的根本原因

Abstract:

Micro-thermal contraction phenomenon of atom clusters in metal melts was discussed based on the X-ray diffraction experimental results of many pure metals and alloys, theoretical analysis and the free volume theory. The essentials and the mechanism of micro-thermal contraction were revealed. The micro-thermal contraction is the result of the expansion of free volume which is stronger than the expansion of melt volume. The structural change of clusters is the fundamental cause of thermal contraction.