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Development of a mathematical model to study the feasibility of creating a clad AZ31 magnesium sheet via twin roll casting

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Abstract

A previously developed and validated thermal-fluid mathematical model of the twin roll casting (TRC) process for magnesium alloy AZ31 was used to quantitatively study the feasibility of producing a clad magnesium strip via the TRC process. The clad material was varied to identify the effect of material composition on the feasibility of producing a clad strip. The clad alloys chosen included pure Zn, pure Al, AA3003, and AA5182 aluminum alloys. In the analysis, the effect of casting speed and clad sheet thickness (100 and 500 μm) on the thermal history in the magnesium strip and clad layer was analyzed. Assessment of the process feasibility was determined based on the exit temperature of the clad strip at the centerline, temperature of the clad sheet prior to the roll bite entry, and fraction solid of both the core (magnesium sheet) and clad along the core/clad interface. The results indicated that using pure Zn as a clad material is not feasible due to premelting of the clad strip prior to introduction into the TRC apparatus. All three aluminum alloys studied proved to be feasible in terms of a clad material, and it was found that the effect of clad thickness and clad material chemical composition on the thermal history (temperature distribution) of the clad strip was negligible. It was also predicted using the thermodynamics package FactSage™ that the intermetallic phase at the core/clad interface will be primarily γ-Mg (Mg17Al12). For AA5182 clad material, formation of β-Mg (Al3Mg2) is also possible.

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Authors and Affiliations

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

    Amir Hadadzadeh, Mary A. Wells & Vignesh Jayakrishnan

Authors
  1. Amir Hadadzadeh
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  2. Mary A. Wells
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  3. Vignesh Jayakrishnan
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Correspondence to Amir Hadadzadeh.

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Hadadzadeh, A., Wells, M.A. & Jayakrishnan, V. Development of a mathematical model to study the feasibility of creating a clad AZ31 magnesium sheet via twin roll casting. Int J Adv Manuf Technol 73, 449–463 (2014). https://doi.org/10.1007/s00170-014-5831-6

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  • DOI: https://doi.org/10.1007/s00170-014-5831-6

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