Damage prediction of 7025 aluminum alloy during equal-channel angular pressing

M. Ebrahimi, Sh. Attarilar, C. Gode, F. Djavanroodi

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    Cite this article as:

    M. Ebrahimi, Sh. Attarilar, C. Gode, and F. Djavanroodi, Damage prediction of 7025 aluminum alloy during equal-channel angular pressing, Int. J. Miner. Metall. Mater., 21(2014), No. 10, pp.990-998. https://dx.doi.org/10.1007/s12613-014-1000-z
    M. Ebrahimi, Sh. Attarilar, C. Gode, and F. Djavanroodi, Damage prediction of 7025 aluminum alloy during equal-channel angular pressing, Int. J. Miner. Metall. Mater., 21(2014), No. 10, pp.990-998. https://dx.doi.org/10.1007/s12613-014-1000-z
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    Damage prediction of 7025 aluminum alloy during equal-channel angular pressing

    • Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran

    • Department of Materials Engineering, Sahand University of Technology, Tabriz, 51335-1996, Iran

    • School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, 20100, Turkey

    • Department of Mechanical Engineering, Imperial College, London, SW7 2AZ, UK

    基金项目: 

    This work was financially supported by the Scientific and Technological Research Council of Turkey (TÜBITAK) under the 2216 Research Fellowship Program for Foreign Citizens.

      通信作者:

      M. Ebrahimi E-mail: mebrahimi@iust.ac.ir

    中文摘要

    Equal-channel angular pressing (ECAP) is a prominent technique that imposes severe plastic deformation into materials to enhance their mechanical properties. In this research, experimental and numerical approaches were utilized to investigate the mechanical properties, strain behavior, and damage prediction of ECAPed 7025 aluminum alloy in various conditions, such as die channel angle, outer corner angle, and friction coefficient. Experimental results indicate that, after the first pass, the yield strength, ultimate tensile strength, and hardness magnitude are improved by approximately 95%, 28%, and 48.5%, respectively, compared with the annealed state, mainly due to grain refinement during the deformation. Finite element analysis shows that the influence of die channel angle is more important than that of outer corner angle or friction coefficient on both the strain behavior and the damage prediction. Also, surface cracks are the main cause of damage during the ECAP process for every die channel angle except for 90°; however, the cracks initiated from the neighborhood of the central regions are the possible cause of damage in the ECAPed sample with the die channel angle of 90°.

     

    Damage prediction of 7025 aluminum alloy during equal-channel angular pressing

    Author Affilications

      • Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran

      • Department of Materials Engineering, Sahand University of Technology, Tabriz, 51335-1996, Iran

      • School of Denizli Vocational Technology, Program of Machine, Pamukkale University, Denizli, 20100, Turkey

      • Department of Mechanical Engineering, Imperial College, London, SW7 2AZ, UK

    • Funds: 

      This work was financially supported by the Scientific and Technological Research Council of Turkey (TÜBITAK) under the 2216 Research Fellowship Program for Foreign Citizens.

    • Received: 11 February 2014; Revised: 30 April 2014; Accepted: 03 May 2014;
    Equal-channel angular pressing (ECAP) is a prominent technique that imposes severe plastic deformation into materials to enhance their mechanical properties. In this research, experimental and numerical approaches were utilized to investigate the mechanical properties, strain behavior, and damage prediction of ECAPed 7025 aluminum alloy in various conditions, such as die channel angle, outer corner angle, and friction coefficient. Experimental results indicate that, after the first pass, the yield strength, ultimate tensile strength, and hardness magnitude are improved by approximately 95%, 28%, and 48.5%, respectively, compared with the annealed state, mainly due to grain refinement during the deformation. Finite element analysis shows that the influence of die channel angle is more important than that of outer corner angle or friction coefficient on both the strain behavior and the damage prediction. Also, surface cracks are the main cause of damage during the ECAP process for every die channel angle except for 90°; however, the cracks initiated from the neighborhood of the central regions are the possible cause of damage in the ECAPed sample with the die channel angle of 90°.

     

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