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Characterization of Hot Workability of 5052 Aluminum Alloy Based on Activation Energy-Processing Map

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Abstract

In the design of hot forming processes for aluminum alloys, hot processing maps are usually used as a powerful tool for processing parameters optimizations. Although the stability of deformation is considered in conventional hot processing (CHP) maps, the difficulty of deformation, i.e., whether deformation is easy to occur, is not taken into account. Therefore, it is difficult for CHP maps to efficiently and accurately obtain the optimal processing parameters and achieve satisfying hot workability. Hence, in this study, thermal compression tests were performed to investigate the hot forming behavior of 5052 aluminum alloy in the deformation temperature range of 553-733 K and strain rate range of 0.001-1 s−1. We proposed an activation energy-processing (AEP) map by coupling the CHP map and the activation energy value, and thereby applied it to evaluate the hot workability of 5052 aluminum alloy. In CHP maps, the region with the highest power dissipation efficiency is generally considered to be the best processing region. However, the AEP map shows that materials with satisfying hot workability not only depends on high power dissipation efficiency, but also on low activation energy values. At the strain of 0.7, the optimal hot processing region predicted by the CHP map lies in the temperature range of 583-673 K and strain rate range of 0.001-0.1 s−1, but that predicted by AEP map locates in the temperature range of 643-733 K and strain rate range of 0.001-0.1 s−1. Microstructure characterization implies that the optimal processing region predicted by the CHP map presents necklace-like structures, which are non-uniform and unbeneficial for deformation, while that predicted by the AEP map consists of fine, uniform and equiaxed grains. Thus, it is implied that the processing regions predicted by the AEP map are more suitable for forming, i.e., the reasonability of the AEP map is verified.

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Acknowledgments

This work was financially supported by National Natural Science Found for Distinguished Young Scholars of China (Grant No.: 51725504) and the Key Program of National Natural Science Foundation of China (Grant No. 51435007). The authors are also grateful for the technical assistance from the Analytical and Testing Center of Huazhong University of Science and Technology.

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Authors and Affiliations

  1. State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China

    Peng Zhou, Lei Deng, Mao Zhang, Pan Gong & Xin-yun Wang

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  1. Peng Zhou
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  2. Lei Deng
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  3. Mao Zhang
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  4. Pan Gong
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  5. Xin-yun Wang
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Contributions

XW and PZ conceived and designed the experiments; LD performed the experiments; PG contributed reagents/materials/analysis tools; PZ wrote the paper and analyzed the data; MZ and XW reviewed and revised the paper.

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Correspondence to Xin-yun Wang.

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Zhou, P., Deng, L., Zhang, M. et al. Characterization of Hot Workability of 5052 Aluminum Alloy Based on Activation Energy-Processing Map. J. of Materi Eng and Perform 28, 6209–6218 (2019). https://doi.org/10.1007/s11665-019-04367-7

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  • DOI: https://doi.org/10.1007/s11665-019-04367-7

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