Effects of B2O3 Flux on the Synthesis and Microstructure of Aluminum Metal Matrix Composites

new flux method is explored to decrease the reactive temperature of in situ chemical reaction to fabricate particles reinforced aluminum matrix composites. When B2O3 flux is added into the mixed reactive salts the melting points of them decrease with the increase of adding amount of B2O3 in the range of 1-5wt.%. When w(B2O3)=5% the melting point of K2TiF6-B2O3 salt is 450°C,which is decreased by 90°C compared with that of pure K2TiF6. Meanwhile the in situ reactive time is shortened and the actual volume fraction is increased.