The Comparison of the Microstructure and Hardness of AI-B and AI-Mg-B Composites

Aluminum base composite materials with variable properties which have been strengthened by aib2 particles have been widely used. in this study. composites with variable properties of ai-5%b and ai-2%mg-2%b which are produced through centrifugal casting are investigated as far as their microstructure and hardness are concerned. the microstructure of these composite were studied by using metallography. also the vickers microhardness test was performed on the samples. the review of the results of the microstructure showed that the volume fraction within the composite particles has continuously changed and therefore produces a non-uniform microstructure with continuously varying properties. particle separation of aib2 towards the casting regions led to higher hardness in this region. the volume fraction of aib2 particles in the studied composites showed a strongdependence on the presence of magnesium in the composite structure.