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Strain Compensation of the Constitutive Equation for High Temperature Flow Stress of a Al-Cu-Li Alloy

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Abstract

In order to study the workability of a Al-Cu-Li alloy, isothermal hot compressive deformation was investigated in the temperature range of 350-500 °C at strain rates in the range of 0.01-10/s up to a true strain of 0.9 on Gleeble-1500 mechanical testing machine. The flow stress increased rapidly to a peak value. The peak stress decreased with increasing deformation temperature and decreasing strain rate. The effects of strain rate and temperature on hot deformation behavior can be represented by a Zener-Hollomon parameter including an Arrhenius term. The influence of the strain has also been incorporated in the constitutive equation and four material constants α, n, A, and the activation energy Q were calculated by compensation of strain. The proposed constitutive equation (considering the compensation of strain) gives an accurate description for the flow stress of the Al-Cu-Li alloy.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Ling Ou, Yufeng Nie & Ziqiao Zheng

  2. Mittal Metal Industry Research Institute, Central South University, Room 406, 932 Lushan South Road, Changsha, 410083, China

    Ling Ou & Yufeng Nie

  3. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou, 412000, China

    Ling Ou & Yufeng Nie

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  1. Ling Ou
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  2. Yufeng Nie
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Correspondence to Ling Ou.

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Ou, L., Nie, Y. & Zheng, Z. Strain Compensation of the Constitutive Equation for High Temperature Flow Stress of a Al-Cu-Li Alloy. J. of Materi Eng and Perform 23, 25–30 (2014). https://doi.org/10.1007/s11665-013-0747-0

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  • DOI: https://doi.org/10.1007/s11665-013-0747-0

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