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Prediction of the Hot Flow Stress Behavior of AA6063 Including Mg2Si Dissolution

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Abstract

A constitutive model that includes the effect of Mg2Si dissolution during pre-deformation heating and holding has been developed for the prediction of the hot flow stress behavior of AA6063 aluminum alloy. The deformation behavior of homogenized AA6063 aluminum alloy was studied by performing compression tests on a Gleeble 3500 thermomechanical simulator at temperatures ranging from 400 to 550 °C and strain rates from 0.01 to 10 s−1. A one-dimensional model of particle dissolution in spherical coordinate system was developed to determine the Mg-Si solute content during pre-deformation heating and holding. Using the Mg solute content determined from the particle dissolution model, the flow stress during the deformation of AA6063 aluminum alloy at specific temperatures and strain rates was predicted using a modified hyperbolic sine equation. The constitutive model developed was found to be in good agreement with experimental measurements in this study as well as other experimental and model results published in the literature. A 14% increase in flow stress of the alloy was observed for an increase in hold time from 60 to 1500 s at 450 °C. This is due to increased deformation resistance of the alloy as the Mg-Si solute content increases. The modified hyperbolic sine equation developed in this study clearly shows that accounting for Mg-Si solute content improves the ability to accurately predict the flow stress behavior of AA6063 aluminum alloy.

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Acknowledgment

The authors acknowledge Canada’s Natural Science and Engineering Research Council (NSERC) automotive partnership for Canada for the financial support provided. Authors also thank the staff of the engineering machine shop at University of Waterloo for machining Gleeble samples.

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  1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON, Canada

    Daniel Odoh, Yahya Mahmoodkhani, Mark Whitney & Mary Wells

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  1. Daniel Odoh
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  2. Yahya Mahmoodkhani
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  3. Mark Whitney
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Correspondence to Daniel Odoh.

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Odoh, D., Mahmoodkhani, Y., Whitney, M. et al. Prediction of the Hot Flow Stress Behavior of AA6063 Including Mg2Si Dissolution. J. of Materi Eng and Perform 26, 1186–1194 (2017). https://doi.org/10.1007/s11665-017-2557-2

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  • DOI: https://doi.org/10.1007/s11665-017-2557-2

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