Effect of Sintering Temperatures on Mechanical Properties of AA7075/B4C/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

Abstract

Materials which are having high strength-to-weight ratio, high stiffness, hardness, and corrosion resistance should attain high priority in case of material selection for industrial applications, defense, and aerospace sectors. There are so many materials which are selected depending upon type of applications; they are super alloys, shape memory alloys, high entropy alloys, and composite materials. Among all, composite materials find major applications in automobile, military and aerospace, especially aluminum metal matrix composites are in demand because of its high strength-to-weight ratio and high corrosion resistance compared to other composite materials. In the present work, experimental investigation on aluminum (AA7075) hybrid composite with B4C (6%) and graphite (2%) as reinforcements by altering the sintering temperatures and their effect on mechanical properties of the composite material were studied. From the results, it was concluded that added graphite acts as binder material that helps in enhancement in strength of the composite material at high sintering temperatures and also by increasing the sintering temperatures mechanical properties of the composite material improves along with reducing porosity levels but beyond the critical sintering temperatures porosity levels increases that effects the composite material in negative way. From the results, it was concluded that added graphite acts as binder material that helps in enhancement in strength of the composite material at high sintering temperatures and also by increasing the sintering temperatures mechanical properties of the composite material improves along with reducing porosity levels but beyond the critical sintering temperatures porosity levels increases that effects the composite material in negative way.