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Impact of Hot Rolling on Mechanical Characteristics of AA7075/TiB2/Graphite Hybrid Composites

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Abstract

The effect of TiB2 (titanium diboride) and Gr (graphite) additions on the mechanical properties of AA7075 alloy is investigated. The composites were formed using stir casting and hot rolling. The in situ reaction method was used to develop 5wt% TiB2 particles, while graphite particles were added externally in 2–8% insteps of 2. With an 80% reduction ratio, the cast composites were hot rolled at 400 °C. The microstructure examination reveals exceptional dispersion of titanium diboride and graphite reinforcement particles, as well as excellent bonding with the matrix alloy. Particles have been positioned more uniformly after hot rolling. Hot rolled hybrid composites, as opposed to cast alloys and composites, have demonstrated exceptional strength and microhardness. The hardness and ultimate tensile strength of the hot rolled composite are increased by 61% and 89%, respectively, when compared to the hot rolled alloy in the cast process. SEM analysis of tensile fractured surfaces revealed ductile and brittle fracture combination modes for hybrid composites in hot rolled and cast conditions.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Government Engineering College, Ramanagara, India

    S. Suhael Ahmed & H. N. Girisha

  2. Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bangalore, India

    R. Keshavamurthy

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  1. S. Suhael Ahmed
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  2. H. N. Girisha
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Ahmed, S.S., Girisha, H.N. & Keshavamurthy, R. Impact of Hot Rolling on Mechanical Characteristics of AA7075/TiB2/Graphite Hybrid Composites. J. Inst. Eng. India Ser. D 103, 191–201 (2022). https://doi.org/10.1007/s40033-021-00311-z

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