Microstructural, Mechanical and Wear behaviour of in-situ Al-TiB2 composites

ABSTRACT

In this study, mechanical and wear properties of in-situ stir cast Al-TiB₂ composites were investigated. The composites were prepared by a metal salt reaction with different (3.0, 5.0 and 7.0 wt %) TiB₂ contents. The microstructure of the composites were examined through an optical and scanning electron microscopy (SEM/EDS). The microstructures clearly revealed the uniform distribution of TiB₂ particles in the Al matrix. The hardness of the in-situ Al-TiB₂ based composites increased by 42%, 55%, and 58% compared to the matrix with the addition of 3, 5, and 7 wt% TiB₂ reinforcements, respectively. The tensile strength of the 3, 5, and 7 wt% TiB₂ stir-cast composites increased by 25%, 33%, and 45%, respectively, compared to the matrix, whereas the ductility decreased by 4.9%, 24.3%, and 41.3%, respectively. A pin-on-disk tester was used to perform a dry sliding wear test at different loads and sliding speeds. In comparison to the Al matrix, the composite materials showed improved wear resistance. Furthermore, in the entire applied loads and sliding velocities, the wear rate decreased with the increase in TiB₂ content. The composites displayed lower wear rates due to their high hardness and strong interfacial bonding between the in-situ reinforcement and the matrix alloy.

KEYWORDS:

• In-situ composite
• microstructure
• hardness
• tensile strength
• ductility
• wear rate

Acknowledgements

The authors would like to thank the Mechanical Department of Tontadarya College of Engineering, Gadag for providing necessary facilities and support for this work.

Disclosure statement

No potential conflict of interest was reported by the authors.