Titanium boride and titanium silicide phase formation by high power diode laser alloying of B4C and SiC particles with Ti: Microstructure, hardness and wear studies

Monisha, K and Shariff, SM and Raju, R and Manonmani, J and Jayaraman, S (2022) Titanium boride and titanium silicide phase formation by high power diode laser alloying of B4C and SiC particles with Ti: Microstructure, hardness and wear studies. In: Materials Today Communications, 31 .

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Abstract

In this work a novel multiphase titanium metal matrix composite (TMMC) coating was developed by high power diode laser assisted alloying of Cp-Ti with the preplaced Boropak powder consisting of B4C and SiC ceramic particles. The XRD, optical microscopy, scanning electron microscopy, EDAX, microhardness and wear testing techniques were employed to investigate structural phase, hardness and wear properties of the alloyed coating. Under the influence of multipass laser alloying, the B4C and SiC ceramic particles decompose to yield boron, silicon and carbon species that react with molten titanium to form TiB2, TiB, TiC and Ti5Si3 phases in the laser alloyed coating. In addition, the un-melted B4C and SiC ceramic particles are dispersed in the titanium matrix. Microstructure of the alloyed coating consists of dendrites and coralline-like structure. The tips of the coralline-like structure are in the range of 150–500 nm. The ceramic multiphase TiB2, TiB, TiC and Ti5Si3 formation resulted in average microhardness around 800–2200 HV0.2 at different regions of the TMMC coating cross section. To correlate the phase formation and microstructural features, surface temperature evolved at the interaction area during laser surface alloying was estimated by a simple equation. Activation energy for the laser melted track was calculated using the Arhennius equation. The linear reciprocating wear test performed on laser alloyed coating against WC ball showed wear rate value of 1.623 х 10−4 mm3/N.m which is 6 times lower compared to the untreated titanium.

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Activation energy; Alloying; Boron carbide; Coatings; Microhardness; Power semiconductor diodes; Scanning electron microscopy; Semiconductor lasers; Silicides; Silicon; Silicon alloys; Silicon carbide; Titanium alloys; Titanium carbide; Wear of materials, Ceramics particles; Laser alloying; Multi-pass; Multipass laser alloying; Multiphases; Phase formations; SiC ceramics; Titanium boride; Titanium metal matrix composites; Titanium silicide, Metallic matrix composites
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Jun 2022 07:29
Last Modified:	29 Jun 2022 07:29
URI:	https://eprints.iisc.ac.in/id/eprint/73966

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