Effects of variations in the addition of SiCp filler to corrosion rate of metal matrix composites (MMCs) Al-Cu-Mg/SiCp

Abstract

We study of effecs Al-Cu-Mg/SiC_p Metal Matrix Composites (MMCs) with a matrix composition of 4.4 wt% Cu, 1.8 wt% Mg with SiC_p fillers were varied (3.4; 3.7 and 4.0) wt% and the remaining Al. SiC_p is mixed into Al-Cu-Mg heated at 900oC, then stir casting is carried out at 250 rpm for 10 minutes. Then cooling is carried out to room temperature. After cold, heat treatment is given and continued testing. The SEM-EDX and XRD test results showed that the increasing SiC_p content, the tendency for SiC_p and Mg bonds to form the Mg2Si phase increased, making the sample items enlarge and appear coarser. While the corrosion rate test of increasing SiC_p in the Al-Cu-Mg matrix makes Al-Cu-Mg/SiC_p samples tend to be more corrosion resistant. The event of declining corrosive properties is due to SiC_p particles occupying grain boundary areas replacing O₂ (which provides corrosive properties) that are trapped in the sample during the cooling process.