Synthesis and Characterization of In-Situ AA8011-TiB2 Composites Produced by Flux Assisted Synthesis

Abstract

In-situ aluminium alloy 8011 matrix composites containing different weight percentages of titanium diboride were synthesized by flux assisted synthesis using stir casting technique. The metallurgy of the in-situ AA8011-TiB2 composites was analyzed using X-ray diffractometer, scanning electron microscope and energy dispersive spectroscope to disseminate the formation and distribution of reinforcements. Density, microhardness and tensile strength of cast AA8011 and in-situ AA8011-TiB2 composites were measured and analyzed. The in-situ formed TiB2 reinforcements showed the maximum hardness of 55.03 Hv and the maximum tensile strength of 158.2 MPa for 8 wt. % of TiB2 whereas the percentage elongation of 7.2% is observed at 4 wt. % of TiB2. Further, the fractography analysis performed on the fractured tensile samples and the mechanism of failures were identified and reported.

Influence of TiC Particles on Mechanical and Tribological Characteristics of Advanced Aluminium Matrix Composites Fabricated through Ultrasonic-Assisted Stir Casting

“…The presence of deep voids with larger areas can be attributed to the detachment of reinforcement particles and the initiation and propagation of cracks caused by higher stress concentrations near the TiC particulates. Continuing to Figure 12d, the postfailure analysis of the fractured Al-6 wt.% TiC composite revealed a mixed ductile/brittle failure mode characterised by the presence of fine and large dimples, as well as elongated bands [56]. The development of voids within the metal matrix is a primary factor influencing the failure of MMCs.…”