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Semi-solid Constitutive Parameters and Failure Behavior of a Cast AA7050 Alloy

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Abstract

AA7050 is an aluminum alloy with superior mechanical properties; however, it is prone to hot tearing (HT) during its production via direct-chill casting. This study focuses on extracting constitutive parameters of the alloy thermomechanical behavior in semi-solid state as well as gaining insight in its failure behavior. Tensile tests were performed using an Instron 5944 at solid fractions between 0.85 (550 °C) and 1.0 (465 °C), at deformation rates of 0.2 and 2 mm/min. The results showed that there are three mechanical behavior regimes in this solid fraction range: ductile at 1.0 (T = 465 °C) ≤ fs < 0.97 (T = 473 °C), brittle at 0.97 (T = 473 °C) ≤ fs ≤ 0.9 (T = 485 °C) and then ductile again (at 0.9 (T = 485 °C) < fs ≤ 0.85 (T = 550 °C)). Fracture surface analysis revealed that the fracture mode was mostly intergranular with fracture propagating through solid bridges as well. Semi-solid constitutive parameters were obtained by making a simple thermal model and numerical tensile tests in ALSIM software package and comparing the simulation results with experimental mechanical tests. The extracted constitutive parameters and available information from the literature support the fact that AA7050 is more susceptible to HT than AA5182 and Al-2 wt pct Cu alloys. The obtained parameters can further enhance the predictive capability of computer simulations of direct-chill casting.

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Acknowledgments

This research was carried out within the Materials innovation institute (www.m2i.nl) research framework, project number M42.5.09340. The establishment of the experimental set-up and testing procedure for the mechanical tensile testing in the semi-solid has been supported by the Norsk Hydro Fond for SINTEF. The authors express their gratitude to Dr. Démian Ruvalcaba and Mr. Jacob van Oord (Tata Steel Research, Development & Technology, The Netherlands) and also to Mr. Andrew Marson, Mr. Hans I. Lange and Mr. Arne Nordmark (SINTEF Materials and Chemistry, Norway) for their support and inputs. Support from the Modelling assisted INnovation for Aluminum DC Casting process (MINAC) community is highly appreciated.

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Authors and Affiliations

  1. Materials innovation institute (M2i), Mekelweg 2, 2628 CD, Delft, The Netherlands

    Tungky Subroto & Alexis Miroux

  2. Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands

    Tungky Subroto, Alexis Miroux & Laurens Katgerman

  3. BCAST, Brunel University London, Uxbridge, Middlesex, UB8 3PH, UK

    Tungky Subroto & Dmitry G. Eskin

  4. Tomsk State University, Tomsk, Russia, 634050

    Dmitry G. Eskin

  5. Alvance Aluminium Duffel, 2570, Duffel, Belgium

    Alexis Miroux

  6. SINTEF Materials and Chemistry, 0314, Oslo, Norway

    Kjerstin Ellingsen & Mohammed M’Hamdi

  7. Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway

    Mohammed M’Hamdi

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  1. Tungky Subroto
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Correspondence to Tungky Subroto.

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Manuscript submitted June 16, 2020; accepted November 23, 2020.

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Subroto, T., Eskin, D.G., Miroux, A. et al. Semi-solid Constitutive Parameters and Failure Behavior of a Cast AA7050 Alloy. Metall Mater Trans A 52, 871–888 (2021). https://doi.org/10.1007/s11661-020-06112-5

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