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Semisolid tensile properties near solidus temperature of direct-chill-cast AA5182 alloy and its hot-tearing susceptibility

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Abstract

A comprehensive investigation, encompassing microstructural analysis of the subsurface and bulk regions, along with tensile testing near the solidus temperature in the range of 520–580 °C and with two strain rates (10–4 and 10–3 s−1), was conducted on two AA5182 alloy ingots (A and B) cast at casting speeds of 60 and 75 mm \(\bullet\) min−1, respectively. Microstructural analysis revealed an equiaxed grain structure throughout Ingot A, whereas Ingot B transitioned from an equiaxed structure in the subsurface to a columnar grain structure in the bulk region. Regarding intermetallic phases, Ingot A showed predominant Al6(Fe,Mn), whereas Ingot B exhibited a high amount of needle-like Al3Fe. Consequently, Ingot A exhibited superior semisolid tensile properties compared to Ingot B at the given test temperatures. The difference between the two ingots became pronounced at the low strain rate of 10–4 s−1, with the brittle temperature range (BTR) values of Ingot B higher than those of Ingot A. An assessment of the hot-tearing susceptibility (HTS) using the BTR criterion revealed that the HTS of Ingot B was higher than that of Ingot A, confirmed by the occurrence of a large transverse macrocrack during the direct-chill casting of Ingot B.

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Acknowledgements

The authors would like to acknowledge the financial supports given by the Fonds de recherche du Québe—Nature et technologies (FRQNT) under Grant No. 2018-LU-252831 and the Mitacs Acceleration under Grant No. IT14722.

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Authors and Affiliations

  1. Department of Applied Science, University of Quebec in Chicoutimi, Saguenay, QC, G7H 2B1, Canada

    Mohamed Qassem, Mousa Javidani & X.-Grant Chen

  2. Department of Mining, Metallurgy and Materials Engineering, Laval University, Québec, QC, G1V 0A6, Canada

    Daniel Larouche

  3. Arvida Research and Development Centre, Rio Tinto Aluminum, Saguenay, QC, G7S 4K8, Canada

    Josée Colbert

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Contributions

Conceptualization was performed by MQ, DL, and X-GC; methodology was done by MQ, MJ, and DL; investigation and writing—original draft preparation were performed by MQ; validation was revised by DL, MJ, and X-GC; writing—review and editing was done by DL, MJ, JC, and X-GC; supervision was performed by DL, JC, and X-GC. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Mohamed Qassem or X.-Grant Chen.

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Qassem, M., Larouche, D., Javidani, M. et al. Semisolid tensile properties near solidus temperature of direct-chill-cast AA5182 alloy and its hot-tearing susceptibility. J Mater Sci 59, 7457–7472 (2024). https://doi.org/10.1007/s10853-024-09625-1

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