High Temperature Mechanical and Creep Performance of AA7075/TaC/Si3N4/Ti Hybrid Metal Matrix Composites

Abstract

An effort was contrived to incorporate aluminium alloy (AA) 7075 reinforced with Silicon Nitride (Si3N4), Tantalum Carbide (TaC), and Titanium (Ti) particulates using conventional stir casting technique. The tension and creep investigations of these composite materials were analysed at room and elevated temperature to regulate their strain to failure and ultimate tensile strength (UTS). The data obtained inferred that addition of these ceramic reinforcements was naturally enhanced the mechanical and creep properties. Strength due to elongation was observed as high as 111.41 N/mm2 at 120°C when compared to unalloyed aluminium alloy. The load tests analysis reveals that the increase in reinforcement wt% of TaC and Ti combinations leads to increase in resistance for deformation failure and the composite is able to with stand 500 kg load at 120°C. The results of the creep tests shows that the ability of the material to with stand an higher cycle time of more than 30,000 seconds when the strain value is 0.02 wt% of reinforcement are 0.5% of TaC, 6% of Si3N4, and 1% of Ti.