EVALUATION OFDISLOCATION STRUCTURE AND CRYSTALLITE SIZE IN WORN AL-SI ALLOY BY X-RAY DIFFRACTION

Abstract: powerful method for the characterization of microstructures of crystalline materials in terms of crystallite size anddislocation structures. In this paper the effect of the sliding on the microstructure of A۳۵۶ in the as-cast and heattreated conditions are studied, The X-ray phase analysis shows that with increasing applied load, the dislocationdensity is increased, whereas the crystallite size is decreased. It was found that heat treatment raised dislocationdensity during wear. The screw or edge character of dislocations in worn specimens were determined by analyzing thedislocation contrast factors, it was demonstrated that the character of the prevailing dislocations in high loads isnearly pure screw.Diffraction peak profile analysis has recently been developed to such an extent that it can be applied as a

Keywords:

Severe Wear , Peak Profile Analysis , Crystallite Size , Dislocation Structure