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Influence of Initial Microstructure on the Hot Deformation Behavior of AZ80 Magnesium Alloy

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Abstract

This research studies the hot deformation behavior of cast and extruded AZ80 magnesium alloys for forging applications. Uniaxial hot compression tests were carried out at a temperature of 400 °C and strain rates ranging from 0.001 to 0.1 s−1, to various strain levels up to a true strain of 1. Detailed microstructure and texture characterizations of the deformed samples were performed using electron backscatter diffraction and x-ray diffraction techniques. The results show that multiple dynamic recrystallization (DRX) mechanisms were simultaneously active in both starting materials at all the tested deformation conditions, resulting in significant grain refinement. Cast and extruded samples showed the development of a similar microstructure, texture, and flow stress by a strain of 1, despite having very different starting microstructures. This was investigated by considering differences in DRX mechanisms and kinetics, and relative deformation mode activities. Since industrial forgings typically involve strains much higher than 1, comparable final microstructure and texture are expected in industrial-scale forgings of AZ80 at 400 °C, irrespective of the starting material state.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. Specific data will be made available on request.

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Acknowledgment

The authors would like to gratefully acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC), Automotive Partnership Canada (APC) program under APCPJ 459269—13 Grant with contributions from Multimatic Technical Centre, Ford Motor Company, and Centerline Windsor. The authors would like to thank Mr. Mark Whitney and Dr. Massimo Di Ciano of UW for help in carrying uniaxial compression tests; Prof. Hamid Jahed and Dr. Sugrib Shaha of UW for help in acquiring XRD texture data; and Ms. Renata Zavadil of CanmetMATERIALS for help in EBSD data acquisition.

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  1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave W, Waterloo, ON, N2L 3G1, Canada

    Paresh Prakash, Jared Uramowski & Mary A. Wells

  2. CanmetMATERIALS, Natural Resources Canada, 183 Longwood Rd S, Hamilton, ON, L8P 0A1, Canada

    Bruce W. Williams

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  1. Paresh Prakash
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Correspondence to Mary A. Wells.

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This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Magnesium. The issue was organized by Prof. C. (Ravi) Ravindran, Dr. Raja Roy, Mr. Payam Emadi, and Mr. Bernoulli Andilab, Ryerson University.

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Prakash, P., Uramowski, J., Wells, M.A. et al. Influence of Initial Microstructure on the Hot Deformation Behavior of AZ80 Magnesium Alloy. J. of Materi Eng and Perform 32, 2647–2660 (2023). https://doi.org/10.1007/s11665-022-07151-2

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