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Transactions of the Indian Institute of Metals

, Volume 72, Issue 9, pp 2299–2310 | Cite as

Synthesis of Aluminium Composites Using Squeeze Casting and Investigating the Effect of Reinforcements on Their Mechanical and Wear Properties

  • R. Krishna Kumar
  • N. RadhikaEmail author
  • Manu Sam
Technical Paper

Abstract

The research aims to fabricate LM25 alloy and composites reinforced with 15 wt% TiB2, 15 wt% ZrO2 and 15 wt% WC using squeeze casting technique. The fabricated cylindrical castings were of dimensions 50 mm diameter and 150 mm length. Microstructural analysis revealed better distribution of reinforcement particles for each composite, which provided better hardness and tensile properties. Physical and wear properties were studied comparatively to understand the influence of reinforcements, and tungsten carbide (WC)-reinforced composites showed better performance. Fractographic analysis revealed ductile mode of failure for LM25 and a combination of ductile and brittle mode for its composites. Dry sliding performance of both alloy and composites was analysed under different sliding conditions of applied load (10–50 N), slide distance (500–2500 m) and slide velocity (1–5 m/s) using pin-on-disc tribometer. WC-reinforced composite improved resistance to wear by 70% compared to alloy. Wear analysis of composite using scanning electron microscope showed change in wear features from mild to severe at high loads. The developed LM25/WC composite was found to be most suitable for non-lubricated slide applications.

Keywords

Squeeze casting Micro-hardness SEM analysis Metal matrix composite Adhesive wear 

Abbreviations

MMC

Metal matrix composites

wt.

Weight

HV

Vickers pyramid number

UTM

Universal testing machine

SEM

Scanning electron microscope

ASTM

American society for testing and materials

MML

Mechanically mixed layer

Notes

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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatoreIndia

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