تأثير المعاملات الحرارية على الخواص الميكانيكية و مقاومة البلى لمادة مركبة ذات أساس المنيوم

الملخص EN

Metal matrix composite (MMCs) of the base alloy (Al-0.978%Mg-1.03%Si) reinforced with SiC particles (10 wt %) with particle size (53-106) μm was prepared by stir casting using vortex technique.

Solution heat treatment and aging are carried out at a constant temperature of 175C° for different aging times.

Many inspections and tests such as microstructure, Vickers hardness and XRD analysis.

Wear test type ( Pin – on – Disc) with various applied loads and different exposure times at constant parameters was carried out under dry sliding conditions.

It was found that the addition of SiC particles to base alloy improved the hardness and wear resistance before and after heat treatment (precipitation hardening).

In addition, using SiC particles with alloy matrix resulted in a faster aging response i.e the time of peak hardness decreased from 8hr to 5hr for base alloy and composite respectively.

These results indicate that the addition of SiC particles to Al –alloy matrix accelerates the aging kinetic.