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Effect of ECAP and Subsequent Annealing on Microstructure, Texture, and Microhardness of an AA6060 Aluminum Alloy

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Abstract

AA6060 aluminum alloy was subjected to severe plastic deformation through equal-channel angular pressing (ECAP) up to 8 passes via route BC. ECAPed samples isochronally annealed for 1 hour at a temperature range of 150-450 °C. The microstructure and texture of the studied material were evaluated by electron backscatter diffraction, and the microhardness was characterized by Vickers microhardness testing. It was found that shearing texture is typically enhanced after ECAP processing. Grain size and grain growth kinetics were also studied. ECAP led to a substantial rise in hardness, with stability following 4 passes. Microstructures and material properties were relatively stable up to annealing temperatures of 150 °C. Some sub-micrometer grains were kept in the 8 passes sample to annealing temperatures of 300 °C. Annealing at elevated temperature resulted in a reduction in hardness leading to a rise in grain size and a decrease in dislocation density. After annealing temperature up to 450 °C, the texture index reveals a tendency to the texture weakening and randomization. The activation energy required for the grain growth of the AA6060 alloy was exceptionally low above 300 °C.

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Acknowledgments

Tarek Khelfa and Zhiguo Chen gratefully acknowledge for the financial support from the National Natural Science Foundation of China (Grant No. 51011120052) and the double first-class discipline construction program of Hunan Province. This work also was supported by the PHC-Maghreb Program No 16MAG03. JMC thanks CONACYT (Mexico) for the economic partial funding of his sabbatical leave at UMSNH.

Funding

National Natural Science Foundation of China (Grant No. 51011120052) and the double first-class discipline construction program of Hunan Province, and PHC-Maghreb Program No. 16MAG03 provided financial assistance for this research.

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  1. Tarek Khelfa and Rabeb Lachhab have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Engineering, School of Energy and Electromechanical Engineering, Hunan University of Humanities Science and Technology, Loudi, 417000, China

    Tarek Khelfa & Zhiguo Chen

  2. Laboratory of Inorganic Chemistry Ur-11-ES-73, Faculty of Sciences, University of Sfax, 1171, 3018, Sfax, Tunisia

    Tarek Khelfa, Rabeb Lachhab & Mohamed Khitouni

  3. Laboratory of Materials and Renewable Energy, Faculty of Sciences, Mohamed Boudiaf University, 28000, M’sila, Algeria

    Hiba Azzeddine

  4. Instituto de Física Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas-CONICET, Universidad Nacional de Rosario, Ocampo y Esmeralda, 2000, Rosario, Argentina

    Jairo Alberto Muñoz

  5. Department of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya, EEBE-c/Eduard Maristany 10-14, 08019, Barcelona, Spain

    José María Cabrera-Marrero

  6. Institute of Research in Metallurgyc and Materials, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-3”, Ciudad Universitaria, 58030, Morelia, Michoacán, Mexico

    José María Cabrera-Marrero

  7. CNRS, Institut de chimie moléculaire et des matériaux d’Orsay, Université Paris-Saclay, 91405, Orsay, France

    François Brisset, Anne-Laure Helbert & Thierry Baudin

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  1. Tarek Khelfa
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  2. Rabeb Lachhab
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  3. Hiba Azzeddine
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  4. Zhiguo Chen
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  7. François Brisset
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Correspondence to Tarek Khelfa or Zhiguo Chen.

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Khelfa, T., Lachhab, R., Azzeddine, H. et al. Effect of ECAP and Subsequent Annealing on Microstructure, Texture, and Microhardness of an AA6060 Aluminum Alloy. J. of Materi Eng and Perform 31, 2606–2623 (2022). https://doi.org/10.1007/s11665-021-06404-w

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