Effects of Addition of SiC and TiB2 Particles on Structural and Mechanical Properties of PM Al-Si Foams

<p>To investigate the structural and mechanical properties of Al-Si 7 wt%-SiC x wt%-TiB2<br>y wt%-TiH2 1 wt% foams produced by powder metallurgy, five distinct compositions including Al-Si7-SiC3, Al-Si7-SiC5, Al-Si7-TiB23, Al-Si7-SiC3-TiB23 and Al-Si7-SiC7-TiB27 were prepared. The effects of adding SiC and TiB2 particles, together and separately, on attainable density, cell structure and compressive behavior of such foam were examined. It was found that increasing the amount of SiC and TiB2 particles in Al-Si foams improves yield strength. The results also showed that addition of ceramic particles increases non-uniformity of cell structure. Furthermore, increasing TiB2 does not significantly affect maximum expansion and therefore does not affect the minimum density.</p

The Influence of Magnesium Addition on the Foaming Efficiency and Compressive Properties of Aluminium Composite Foams Made by a P/M Technology

<p>Microstructure and Compressive properties of two compositionally distinct foams<br>produced by powder metallurgy route were investigated. Although both kinds of foams<br>contain aluminium, silicon and silicon carbide powder particles, in one case Magnesium<br>added to composition. Also for both of them titanium hydride were used as the blowing<br>agent. In both cases, after mixing the powders together for one hour, the mixture were<br>pressed and then extruded. Foaming process was accomplished in specific times at 750 0C<br>and 850 0C. It was noticed that Compressive properties was improved when Mg was added.<br>Moreover, Al-Si-SiC-TiH2-Mg demonstrates much homogenous distribution of bubbles<br>throughout the foam and their stability is more than Al-Si-SiC-TiH2 foams.</p