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Synthesis and forming behavior of aluminium-based hybrid powder metallurgic composites

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Abstract

Aluminium-based metal matrix composites were synthesized from Al-TiO2-Gr powder mixtures using the powder metallurgy technique and their forming characteristics were studied during cold upsetting. Green cylindrical compacts of pure Al, Al-5wt%TiO2, Al-5wt%TiO2-2wt%Gr, and Al-5wt%TiO2-4wt%Gr were made using a 400-kN hydraulic press equipped with suitable punch and die and by sintering at (590 ± 10)°C for 3 h. Cold upset forging tests were carried out, the true axial stress (σ z ), the true hoop stress (σ θ ), and the true hydrostatic stress (σ m) were evaluated and, their behavior against the true axial strain (ɛ z ) was also analyzed. It is observed that the addition of 5wt% TiO2 into the Al matrix increases σ z , σ θ , and σ m. The addition of both TiO2 and Gr reinforcements reduces the densification and deformation characteristics of the sintered preforms during cold upsetting. Microstructure analyses of the as-sintered and cold upset forged specimens also were carried out to substantiate the experimental results.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chendhuran College of Engineering and Technology, Pudukkottai, 622 507, India

    M. Ravichandran & A. Naveen Sait

  2. Department of Production Engineering, National Institute of Technology, Tiruchirappalli, 620015, India

    V. Anandakrishnan

Authors
  1. M. Ravichandran
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  2. A. Naveen Sait
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  3. V. Anandakrishnan
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Correspondence to A. Naveen Sait.

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Ravichandran, M., Naveen Sait, A. & Anandakrishnan, V. Synthesis and forming behavior of aluminium-based hybrid powder metallurgic composites. Int J Miner Metall Mater 21, 181–189 (2014). https://doi.org/10.1007/s12613-014-0883-z

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  • DOI: https://doi.org/10.1007/s12613-014-0883-z

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