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Showing 2 results for A. Rezvanifar
EVALUATION OFDISLOCATION STRUCTURE AND CRYSTALLITE SIZE IN WORN AL-SI ALLOY BY X-RAY DIFFRACTION
A. Rezvanifar, M. Zandrahimi,
Volume 7, Issue 1 (winter 2010 2010)
Abstract

Abstract:

powerful method for the characterization of microstructures of crystalline materials in terms of crystallite size and

dislocation structures. In this paper the effect of the sliding on the microstructure of A356 in the as-cast and heat

treated conditions are studied, The X-ray phase analysis shows that with increasing applied load, the dislocation

density is increased, whereas the crystallite size is decreased. It was found that heat treatment raised dislocation

density during wear. The screw or edge character of dislocations in worn specimens were determined by analyzing the

dislocation contrast factors, it was demonstrated that the character of the prevailing dislocations in high loads is

nearly pure screw.

Diffraction peak profile analysis has recently been developed to such an extent that it can be applied as a
THE INFLUENCE OF DRY SLIDING ON PRCIPITATION HARDENING BEHAVIORS OF Al-Cu-Si ALLOY
M. Zandrahimi, A. Rezvanifar,
Volume 9, Issue 1 (march 2012 2012)
Abstract
Abstract: Cold working performed before an aging treatment has a significant effect on size and amount of precipitate produced. This could be caused by the increase in defect density, such as vacancies and dislocations. In this research, the Al-Cu-Si alloy was solution-treated, wear-tested and then artificially aged for a period of 1–5 h. Changes in the amount of precipitate, in the lattice parameter of the matrix, and in the precipitates are measured by X-ray diffraction and then calculated.It was observed that performing a wear test before the aging treatment was done significantly increased the amount of precipitate, while wear rate decreased.
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