Solidification and Melting – Asymmetries and Consequences

Markus Rettenmayr; Martin Buchmann

doi:10.4028/www.scientific.net/MSF.508.205

Paper Titles

Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys
p.181

Macrosegregation Caused by Deformation of the Mushy Zone
p.187

Gravity-Induced Convection during Directional Solidification of Hypermonotectic Alloys
p.193

Solidification of AlSi Alloys in the ARTEMIS and ARTEX Facilities Including Rotating Magnetic Fields – A Combined Experimental and Numerical Analysis
p.199

Solidification and Melting – Asymmetries and Consequences
p.205

Motion of Fine Particles under Interfacial Tension Gradient in Relation to Solidification of Steel
p.211

Effect of Travelling Magnetic Field on the Directional Solidification of Refined Al-3.5 wt%Ni Alloys
p.221

Microstructure Formation in AlSi7 Alloys Directionally Solidified with Forced Melt Flow
p.227

Macrosegregation in CC Slabs
p.233

HomeMaterials Science ForumMaterials Science Forum Vol. 508Solidification and Melting – Asymmetries and...

Solidification and Melting – Asymmetries and Consequences

Abstract:

Solidification and melting are phase transitions from the liquid to solid state or vice versa and are thus often assumed to be similar processes with only opposite direction. However, they can be fundamentally different, i.e. asymmetric, in aspects of both thermodynamics and kinetics. It is known that superheat in the solid is difficult to obtain, unlike supercooling in the liquid. This is often attributed to the fact that nucleation in the liquid can occur (homogeneously or heterogeneously) in the bulk, in the solid it will occur at outer or inner surfaces of the crystal. A further asymmetry is evident as the growing phase is a phase with fast diffusion kinetics in the case of melting, with slow diffusion kinetics in the case of solidification. Two types of experiments (solutal melting and melting/resolidification in a temperature gradient) are presented that allow an evaluation and quantification of the consequences of these asymmetries.