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Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing

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Abstract

The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-section of the processed samples were correlated with the EBSD analysis. EBSD scans revealed that extended shear bands are formed and represent the microstructural feature induced during micro/meso-forming. Whereas, a non-uniform grain structure consisting of intensive low-angle grain boundaries was obtained in the first pass, a uniform ultrafine-grained structure of high-angle grain boundaries (in the range of 1–2 μm) was achieved at the fourth pass. Consequently, a significant improvement in the hardness value to 65.3%, with respect to the starting material, was achieved due to the enhancement of the fine grain structure. The texture analysis exhibited that the high plastic shear strain associated with micro/meso-scale ECAP was capable to develop a weak texture in the flow plane compared to the starting texture.

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Acknowledgements

One of the authors (W.A) is pleased to acknowledge the financial support from the Missions Sector-Higher Education Ministry, Egypt, and the Japan International Cooperation Agency (JICA) through this work.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Egypt-Japan University of Science and Technology (E-JUST), P. O. Box 179, New Borg El-Arab City, Alexandria, 21934, Egypt

    Walaa Abdel-Aziem, Atef Hamada & Mohsen A. Hassan

  2. Department of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Egypt

    Walaa Abdel-Aziem

  3. Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, Japan

    Takehiko Makino

  4. Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500, Nivala, Finland

    Atef Hamada

  5. Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut, 71515, Egypt

    Mohsen A. Hassan

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  1. Walaa Abdel-Aziem
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  2. Atef Hamada
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  3. Takehiko Makino
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  4. Mohsen A. Hassan
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Correspondence to Walaa Abdel-Aziem.

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Abdel-Aziem, W., Hamada, A., Makino, T. et al. Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing. Met. Mater. Int. 27, 1756–1768 (2021). https://doi.org/10.1007/s12540-019-00544-4

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  • DOI: https://doi.org/10.1007/s12540-019-00544-4

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