Synthesis of Metal Matrix Hybrid Composites and Evaluation of Mechanical and Tribological Properties

Abstract

In this study, B4C and MoS2 were taken as reinforcements and Al2219 as matrix material. The hybrid MMC’s were produced by stir casting technique and Mechanical,Tribological properties of aluminium metal matrix hybrid composites was studied. K2TiF6 halide salt with 0.4Ti/B4C ratio were taken to improve the wettablity of composites.The hybrid composites were characterized by using SEM and XRD.The result reviles that, the fairly distribution of B4Cp and MoS2 right through the image and no clustering can be seen.XRD pattern shows the occurrence of B4C and MoS2 in prepared composites. The Physical and Mechanical properties were determined for Al2219 and hybrid composites. Micro Vickers Hardness of matrix material is low and for hybrid composite is high. Ultimate tensile strength and yield strength of prepared hybrid composites is low when compared to Al2219; it is generally due to crack propagation and particle pull out of MoS2 particle.The dry sliding wear behavior were examine by pin-on disc tribometer for different sliding velocities and test result reviles the specific wear rate is minimum for 1.26 m/s and maximum for 6.30 m/s, as the sliding velocity increases the specific wear rate increases. Tensile fractured surface and worn surface pin samplesof Al2219 and hybrid MMC’s were examine using SEM micrograph