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research-article

Volume Fraction Dependent Wear Behavior of Titanium Reinforced Aluminium Matrix Composites Manufactured by Melt Infiltration Casting

[+] Author and Article Information
Ridvan Gecü

Yildiz Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
ridvangecu@gmail.com

Ahmet Karaaslan

Yildiz Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
karaas@yildiz.edu.tr

1Corresponding author.

ASME doi:10.1115/1.4041126 History: Received May 01, 2018; Revised August 02, 2018

Abstract

This study aims to investigate the effect of volume fraction of commercially pure titanium (CP-Ti) on microstructural, mechanical and tribological features of A356 aluminium matrix composites. Vacuum-assisted melt infiltration casting was performed to produce composites with 50%, 65%, 75% and 80% CP-Ti contents. CP-Ti sawdusts were assembled under mechanical pressure in order to attain porous one-piece CP-Ti preforms which were infiltrated by A356 melt at 730 °C under 10-5 Pa vacuum atmosphere. TiAl3 layer was formed at the interface between A356 and CP-Ti phases. Owing to increased diffusion time through decreased diffusion path length, both thickness and hardness of TiAl3 phase were increased with increasing CP-Ti ratio, whereas the best wear resistance was obtained at 65% CP-Ti ratio. The main reason for decrease in wear resistance of 75% and 80% CP-Ti reinforced composites was fragmentation of TiAl3 layer during wear process due to its excessively increased brittleness. Strongly bonded TiAl3 phase at the interface provided better wear resistance while weakly bonded ones caused to multiply wear rate.

Copyright (c) 2018 by ASME
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