In-situ interfacial growth of TiAl intermetallic and its influence on microparticle dislodgement during abrasive wear of Al/Ti6Al4V composite

Pariyar, A. and Edachery, V. and Abhishek, B.M. and Perugu, C.S. and Rajneesh, H. and Kailas, S.V. (2020) In-situ interfacial growth of TiAl intermetallic and its influence on microparticle dislodgement during abrasive wear of Al/Ti6Al4V composite. In: Materials Today Communications, 24 .

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Abstract

Aluminium matrix composites reinforced with large Ti6Al4V particles (�70 μm) were fabricated using friction stir processing. Such particles were selected as reinforcement in order to study the feasibility of their usage for improving wear properties in the abrasive regime despite their large size. Such a proposition is possible if the interfacial bonding between the reinforcement and the matrix is strong enough to prevent dislodgement of the particles. In this work, we show that the interfacial bonding can be enhanced by in-situ intermetallics formed in the solid-state between the matrix and the reinforcement which, in this case, was TiAl. The interfacial TiAl intermetallic had also fragmented into finer particles ranging from 100 nm to 2 μm during the processing due to their brittle nature. A �46 improvement in wear resistance was observed for the composite compared to the unreinforced material due to the presence of both Ti6Al4V and TiAl particles. Scanning electron microscopy images of the worn-out pin cross-section showed that the subsurface crack nucleation and propagation were all away from the particles, thus, exhibiting strong interfacial bonding between the reinforcement and the matrix.

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier
Additional Information:	Copyright for this article belongs to Elsevier
Keywords:	Abrasion; Aluminum alloys; Binary alloys; Bonding; Friction stir welding; Indium alloys; Intermetallics; Reinforcement; Scanning electron microscopy; Ternary alloys; Titanium alloys; Vanadium alloys; Wear resistance, Aluminium matrix composites; Friction stir processing; Interfacial bonding; Interfacial growth; Scanning electron microscopy image; Subsurface cracks; Ti-al intermetallics; Un-reinforced materials, Particle reinforced composites
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Sep 2020 10:33
Last Modified:	01 Sep 2020 10:33
URI:	http://eprints.iisc.ac.in/id/eprint/65212

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