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

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.

Key words:melt; cluster; micro-thermal contraction; X-ray diffraction