X-ray determination of the dynamic displacement of the aluminum atoms in the single-phase state and in the eutectic Al—Si alloy

 
A.I.Ustinov,
  
L.Melakh,
 
S.A.Demchenkova
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2014, #20
http://www.materials.kiev.ua/article/1707

Abstract

Thermal characteristics of aluminum powder grains and aluminum as a part of Al—Si eutectic system have been investigated by high-temperature X-ray diffraction. At high temperatures in the eutectic systems the Debye temperature and the dynamic thermal displacements of atoms significantly differ from those in the single-phase. Herewith, interatomic bonds weaken and the amplitude of the atoms thermal vibrations increases. It should cause an increase in diffusion activity in the grain-border volumes of phases in eutectic systems and intensify the range of high-temperature processes (powders sintering, creep, etc.). Full text download


DEBYE TEMPERATURE, DIFFUSION, DYNAMIC THERMAL DISPLACEMENTS, EUTECTIC, PHASE TRANSFORMATIONS