Development of Chilled Aluminum Alloy Reinforced with Nano ZrO2 Metal Matrix Composites (NMMCs) & its Property Evaluation

摘要

In the present research, nano-Zr02 particulates were dispersed in aluminum alloy (LM 13) by DMD technique followed by hot extrusion. The size of the particles dispersed varies from 50 to 80 nm and amount of addition varies from 3 to 12 wt.% in steps of 3%. Microstructural studies of the NMMCs (nano-composite) developed indicate that there is uniform distribution of the reinforcement in the matrix alloy with significant grain refinement and retention of residual porosity. Mechanical properties reveal that the presence of nano-Zr02 particulates has improved significantly the strength and hardness with slight reduction in ductility as compared against the matrix alloy. Results of the thermal and electrical tests on the composite developed indicate that, thermal conductivity and electrical resistance both decreased with increase in reinforcement content. It is seen from wear analysis that the load and dispersoid content increases the wear resistance of the composites remarkably.