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Hot deformation mechanisms of a solution-treated Al-Li-Cu-Mg-Zr alloy

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Abstract

Solution-treated 8090 and 8091 Al-based alloys were subjected to hot torsion testing in the temperature range of 300 °C through 500 °C at strain rates of 0.1 to 5 s−1, up to an equivalent strain of 4. The flow stresses for alloys 8090 (8091) were found to depend on strain rate through a sinh function with exponent 3.98 (2.37) and on temperature through an Arrhenius behavior with activation energy of about 287 (282) kJ/mol. Studies using transmission electron microscopy (TEM) have been performed with the aim of understanding the difference in deformation mechanisms at 500 °C, 400 °C, and 300 °C. During hot processing, the mechanism of dynamic recovery is operative. The change in average subgrain size (d) with the conditions of deformation,i.e., Zener-Hollomon parameter and steady-state flow stress (σ s ), was quantitatively characterized. Heat treatment at 550 °C induced the precipitation of Al3Zr particles which are resistant to dislocation shear. Furthermore, electron microscopic analyses have revealed a large number of helical dislocations, prismatic loops, and some Orowan loop formation after deformation at 500 °C and 400 °C. The density of these defects depends on the temperature of deformation and strain rate. At 300 °C, dynamic precipitation of T2 (Al6CuLi3) and T1 (Al2CuLI) phases strongly affected hot deformation behavior. In all cases, the microstructural analyses were consistent with a dual-slope description of the mechanical behavior during hot deformation.

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Authors and Affiliations

  1. the Department of Metallurgy and Materials Science, University of Toronto, M5S 3E4, Toronto, On, Canada

    G. Avramovic-Cingara (Special Lecturer) & D. D. Perovic (Associate Professor)

  2. the Department of Mechanical Engineering, Concordia University, H3G 1M8, Montreal, PQ, Canada

    H. J. McQueen (Professor)

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  1. G. Avramovic-Cingara
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  2. D. D. Perovic
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  3. H. J. McQueen
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Avramovic-Cingara, G., Perovic, D.D. & McQueen, H.J. Hot deformation mechanisms of a solution-treated Al-Li-Cu-Mg-Zr alloy. Metall Mater Trans A 27, 3478–3490 (1996). https://doi.org/10.1007/BF02595440

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