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Characterization of the hot-working behaviour of a P/M Al-20Si-7.5Ni-3Cu-1Mg alloy by hot torsion

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Abstract

Hot torsion tests were performed to investigate the mechanical and microstructural responses of a quinary Al-20Si-7.5 Ni-3Cu-1Mg (wt %) alloy, consolidated from a rapidly solidified powder, to deformation at varying temperatures and strain rates. It was found that, under most of the deformation conditions applied, stress-strain curves were characterized by distinct stress peaks, which are usually absent from the curves shown by conventional aluminium alloys. Temperature and strain rate strongly influenced the stress and ductility of the material. Their combined influence on the peak stress has been expressed with a hyperbolic sine equation. The material also exhibited an extraordinarily high strain rate sensitivity,m, and a largem value variation with temperature. A relatively high value of activation energy for deformation was determined, which clearly reflects additional thermal barriers to metal flow, arising from a high volume fraction of multi-phase particles dispersed in the material. Additionally, the microstructure developed in the course of deformation was examined, which showed evidence of the co-operation of dynamic recovery and recrystallization. The initiation of local dynamic recrystallization is a result of a low level of dynamic recovery achievable in the material, which is again different from conventional aluminium alloys.

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Authors and Affiliations

  1. Laboratory for Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628, AL Delft, The Netherlands

    J. Zhou, J. Duszczyk & B. M. Korevaar

  2. Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, de Croylaan 2, 3001, Heverlee, Belgium

    B. Verlinden

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  1. J. Zhou
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  2. J. Duszczyk
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  3. B. M. Korevaar
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  4. B. Verlinden
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Zhou, J., Duszczyk, J., Korevaar, B.M. et al. Characterization of the hot-working behaviour of a P/M Al-20Si-7.5Ni-3Cu-1Mg alloy by hot torsion. J Mater Sci 27, 4247–4260 (1992). https://doi.org/10.1007/BF01105135

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  • DOI: https://doi.org/10.1007/BF01105135

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