BN Hybrid Metal Matrix Nanocomposites Prepared by Ultrasonic-Assisted Stir Casting (original) (raw)

In the present investigation, Al7010/B 4 C/BN hybrid metal matrix nanocomposites with varying weight percents (wt%) of 0, 0.5, 1.0, 1.5, 2.0 and 2.5 of B 4 C and BN nanoparticles were prepared by ultrasonic-assisted stir casting technique. For the prepared composites, the microhardness and the tribological characteristics were reported. The wear behavior was determined under normal loads of 10, 20, 30 and 40 N and at sliding speeds of 0.5, 1.0 and 1.5 m/s, respectively. The results showed an increase in wear resistance and decrease in friction coefficient with the addition of the nanoparticles. The wear rate and friction coefficient increased with increase in normal load and sliding speed. The scanning electron microscope (SEM) images revealed uniform dispersion of the reinforcement particles in the composite. The wear specimens showed adhesion and plowing behavior at lower loads and delamination at higher load.