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Thermomechanical Characterization of Mg-9Al-1Zn Alloy Using Power Dissipation Maps

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Abstract

A processing map is developed on the basis of the Dynamic Material Model for Mg-9Al-1Zn. The model considers the work piece as a dissipator of power and power loss variation with temperature and strain rate constitutes the power dissipation map. To this end, the thermomechanical (i.e., hot compression) characteristics of a Mg-9Al-1Zn alloy was studied in the temperature range of 250-425 °C and strain rates of 0.001-1 s−1. The strain rate sensitivity (m), power dissipation efficiency (η), and instability parameter (ξ) are computed based on the experimental hot compression data. The deformation mechanisms of different regions in the maps are analyzed and corresponding microstructures are investigated. The processing map of Mg-9Al-1Zn alloy exhibits five workability domains. Dynamic recrystallization (DRX) was observed in three of the domains, while in the two other domains grain boundary sliding, twining, and precipitation are the dominant mechanisms. The optimum hot working conditions of Mg-9Al-1Zn alloy are located in the two domains where DRX takes place. They correspond to 375 °C/0.001 s−1 and 380 °C/1 s−1 with peak efficiency of 42 and 36%, respectively.

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Authors and Affiliations

  1. Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran

    A. R. Maldar & G. R. Ebrahimi

  2. Department of Mechanical and Materials Engineering, Western University, London, ON, Canada

    Meysam Haghshenas

  3. Département de génie mécanique, École de Technologie Supérieure, Montreal, QC, Canada

    M. Jahazi & P. Bocher

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  1. A. R. Maldar
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  2. G. R. Ebrahimi
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Correspondence to Meysam Haghshenas.

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Maldar, A.R., Ebrahimi, G.R., Haghshenas, M. et al. Thermomechanical Characterization of Mg-9Al-1Zn Alloy Using Power Dissipation Maps. J. of Materi Eng and Perform 22, 3306–3314 (2013). https://doi.org/10.1007/s11665-013-0616-x

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  • DOI: https://doi.org/10.1007/s11665-013-0616-x

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