Experimental Analysis on The Flow Properties Of Al-B4C, Al-Tio2 Composites Produced By P/M Process

Abstract

Aluminium is one of the widely used metals for industrial applications because of its desired properties viz., light weight with density of 2700 kg/m3, good corrosion resistance and also low cost which makes it suitable for aerospace and aircraft applications. In the present investigation, aluminium (99.5% purity) had been separately reinforced with 5 weight percentage, 7.5 weight percentage, and 10 weight percentage of boron carbide (B4C) and titanium di-oxide (TiO2). The composites were fabricated by powder metallurgy technique. The micro hardness measurement taken on the sintered compacts reveals that micro hardness increases with increasing weight percentage of reinforcement. The samples were subjected to upsetting compression test. True stress and True strain values were determined with the help of load – displacement curve. Subsequently strain hardening exponent (n) and strength coefficient (k) were determined from true stress and true strain plot popularly known as flow curve. The strain hardening exponent (n) decreases with increasing weight percentage of reinforcement whereas strength coefficient (k) increases with higher weight percentage of reinforcement. Optical micrographs were employed to study the porosity and micro structural changes after upsetting test.