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Hot Deformation Behavior of Homogenized Al-7.8Zn-1.65Mg-2.0Cu (wt.%) Alloy

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Abstract

The flow curves of Al-7.8Zn-1.65Mg-2.0Cu (wt.%) alloy in the temperature range of 300-450 °C and strain rate range of 0.01-10 s−1 were obtained by hot compression tests on a Gleeble-3500 isothermal simulator. The effects of deformation heat-induced temperature rising and friction on the flow curves were discussed and the flow curves were corrected to exclude these influences. The constitutive model was constructed and its accuracy was evaluated by the correlation coefficient (R) and average absolute relative error. The values of the corresponding evaluators were determined to be 0.9841 and 6.2346%, respectively. The processing maps were developed and through which the optimal hot working window for this alloy was determined in the range of 380-450 °C and 0.01-0.368 s−1. The microstructure evolution observations revealed that micro-crack and flow localization occurred at 300 °C and 10 s−1 and 400 °C and 10 s−1, which located in the instability region of processing map. With the increasing strain rate, the deformation activation energy decreased, simultaneously, the dislocation multiplication rate accelerated, which resulted in pronounced increasing of LAGBs and HAGBs.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgments

The authors gratefully appreciate Chongqing Science and Technology Commission (cstc2021jcyj-msxmX0653), the Foundation of Science and Technology Project of Chongqing Education Commission (No. KJQN202101515), Research Foundation of Chongqing University of Science and Technology (No. ckrc2020015), Innovation Research Group of Universities in Chongqing (CXQT21030), Chongqing Talent Project (CQYC201905100).

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Authors and Affiliations

  1. Southwest Aluminum Group Co. Ltd, Chongqing, 401326, China

    Dao-xiang Wu, Shu-yan Wang & Lin Hai-tao

  2. College of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing, 400331, China

    Shuai Long & Qing-wei Dai

  3. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Shi-shan Li & Yu-ting Zhou

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  1. Dao-xiang Wu
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Wu, Dx., Long, S., Li, Ss. et al. Hot Deformation Behavior of Homogenized Al-7.8Zn-1.65Mg-2.0Cu (wt.%) Alloy. J. of Materi Eng and Perform 32, 3431–3442 (2023). https://doi.org/10.1007/s11665-022-07328-9

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