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Effect of silicon carbide volume fraction on the hot workability of 7075 aluminium-based metal–matrix composites

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Abstract

The hot deformation behaviour and microstructure evolution of stir cast 7075Al alloy and 7075Al alloy with 10, 15 and 20 % volume fraction of 20 μm SiCp composites have been studied by using the processing maps. The compression tests were conducted on both alloys and composites in the temperature range of 300–500 °C and the strain rate range of 0.001–1.0 s−1 to establish the processing map. The dynamic recrystallization and instability zones were identified and validated through micrographs. The composites showed higher flow stress, efficiency and lower instability regimes than alloy. The 15 % volume fraction of SiCp composites achieved better hot workability due to grain refinement, hardening and strengthening of the material.

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Authors and Affiliations

  1. Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, 608002, India

    M. Rajamuthamil selvan & S. Ramanathan

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  1. M. Rajamuthamil selvan
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  2. S. Ramanathan
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Correspondence to M. Rajamuthamil selvan.

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Rajamuthamil selvan, M., Ramanathan, S. Effect of silicon carbide volume fraction on the hot workability of 7075 aluminium-based metal–matrix composites. Int J Adv Manuf Technol 67, 1711–1720 (2013). https://doi.org/10.1007/s00170-012-4604-3

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  • DOI: https://doi.org/10.1007/s00170-012-4604-3

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