Fatigue Life and Failure Characteristics of an Ultrafine-Grained Ti–6Al–4V Alloy Processed by ECAP and Extrusion

Authors

  • Alexander V. Polyakov,

    Corresponding author
    1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, RB, Russia
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  • Irina P. Semenova,

    1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, RB, Russia
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  • Yi Huang,

    Corresponding author
    1. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, UK
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  • Ruslan Z. Valiev,

    1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, RB, Russia
    2. Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, Universitetsky pr. 28, Peterhof, Saint Petersburg, Russia
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  • Terence G. Langdon

    1. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, UK
    2. Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, USA
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  • This work was supported in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS. We thank the Royal Society of the U.K. for providing support under International Joint Project No. JP091299, which permitted AVP to conduct research at the University of Southampton.

Abstract

Experiments were conducted to investigate the low-cycle deformation behavior of an ultrafine-grained (UFG) Ti–6Al–4V alloy produced by severe plastic deformation (SPD) through a combination of equal-channel angular pressing (ECAP) and extrusion. The fatigue properties were examined by stress-controlled fatigue testing at stress amplitudes in the range of 700–1050 MPa. The specimens exhibited a dimpled final overload fracture mode. The results show the UFG alloy has a longer fatigue life and a finer dimple size than the coarse-grained material.

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