Papers by Keyword: Liquid Metallurgy

Abstract: The present research focuses on the synergetic effect of ZrB₂-Si₃N₄ on the properties of AA8011 for service life improvement in automobile components. The hybrid composites were developed by liquid metallurgy route with varying particulates composition of 0% - 20% in a step of 5. The developed composites were subjected to SEM microstructural characterization and mechanical analysis to evaluate their microstructural evolution, microhardness, and tensile strength mechanism. The results show better improvement in the hardness and ultimate tensile strength of the composite when compared with the unreinforced AA8011. The microstructure clearly revealed an even dispersion of hybrid particulates with no clear trace of voids.

Abstract: The Al2014 alloy is extensively used as a structural material in aerospace industry and also it is proving to fit as wear resistant materials especially in sliding wear applications. In the present paper, the wear analysis of hybrid Al-MMCs utilising Al2014 alloy as matrix and Silicon carbide (SiC) / Graphite (Gr) particulate reinforcements was studied by changing load, speed and percentage reinforcement. Al2014+10%SiC composites and Al2014/(5%SiC+5%Gr) were prepared using liquid state processing. The wear test is carried out by using pin on disc with sliding speeds range from 0.84-1.67m/s and loads from 25-75N and sliding distance of 1000m.The outcomes demonstrated that the connected load had positive effect on wear rate while sliding rate indicates reverse movement on wear rate. The incorporation of SiC and Gr is observed to be significant on account of self-lubricating impact of Gr and resistance to material plastic flow due to SiC reinforcement.

Abstract: Cu-8Cr-4Nb alloy with high strength and high thermal conductivity have received a lot of attention over the last decades due to promising role in space application of rocket combustion chamber of reusable launch vehicle. In the present work, the copper alloy is synthesized in induction furnace by liquid metallurgy route wherein elemental powders of chromium and niobium was used added into premelted copper melt under argon atmosphere. The cast product is characterised for hardness, optical, SEM, EDS and XRD. It is possible to produce this alloy with reproducible average hardness of 135 VHN. The precipitate of Cr₂Nb showed moderate distribution in and around the grain boundaries of copper with precipitate size varying from 1.33 μm to7.0 μm.