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A New Constitutive Model for 7055 Aluminum Alloy

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Abstract

The hot deformation behavior of spray-formed 7055 aluminum alloy was investigated using a thermo-mechanical simulator by a series of isothermal and constant strain-rate compression tests. These tests were at deformation temperatures ranging from 653 to 713 K and strain rates ranging from 0.1 to 15s−1. The microstructure characteristics of these deformed samples were examined by optical microscope (OM) and electron back-scattered diffraction (EBSD) techniques. The material flow patterns and relevant microstructural analyses indicated that specific thermo-mechanical conditions including the Zener-Hollomon parameter, temperature, and strain, determined the onset and degree of obvious dynamic recrystallization (DRX) behavior. A partially recrystallized grain microstructure was observed and enhanced the flow softening especially at low Zener-Hollomon values. The influence of different hot deformation conditions on the material flow behavior and the evolution of microstructure was confirmed. A new three-stage constitutive equation, accompanied by a microstructure evolution model, was developed to predict the flow stress of sprayed-formed 7055 aluminum alloy and the corresponding characteristics of DRX transformation during the hot deformation process. The predicted performance was evaluated by experimental data and showed good accuracy.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Yong Shao, Qihang Liu, Lin Yan, Jiahui Shi, Pingyi Guo & Shujin Chen

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  1. Yong Shao
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Shao, Y., Liu, Q., Yan, L. et al. A New Constitutive Model for 7055 Aluminum Alloy. J. of Materi Eng and Perform 31, 8183–8198 (2022). https://doi.org/10.1007/s11665-022-06869-3

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