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Using ball indentation to determine the mechanical properties of an Al-7475 alloy processed by high-pressure torsion

  • Nanostructured Materials
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Abstract

A commercial Al-7475 alloy with an initial grain size of ~40 μm was processed by high-pressure torsion (HPT) for up to 2 turns at room temperature under a pressure of 6.0 GPa. The mechanical properties of the processed materials were evaluated by the ball-indentation technique to give information on the yield strength and the ultimate tensile strength. Following HPT, microhardness measurements revealed a steady increase in the hardness values from the centers of the samples towards the edges. After 2 turns, the ultimate tensile strength was ~1050 MPa at the edge of the disk and the measured grain size was ~70 nm. The results demonstrate the potential for using HPT to achieve excellent grain refinement in the Al-7475 alloy.

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Acknowledgements

This work was supported in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.

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Authors and Affiliations

  1. Visvesvaraya Technological University, Belgaum, 590018, India

    Deepak C. Patil & S. A. Kori

  2. CSIR—National Aerospace Laboratories, Bangalore, 560017, India

    K. Venkateswarlu

  3. CSIR—National Metallurgical Laboratory, Jamshedpur, 831007, India

    Gautam Das

  4. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    Saleh N. Alhajeri & Terence G. Langdon

  5. Department of Manufacturing Engineering, College of Technological Studies, PAAET, 70654, Shuwaikh, Kuwait

    Saleh N. Alhajeri

  6. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Terence G. Langdon

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  1. Deepak C. Patil
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  2. S. A. Kori
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  3. K. Venkateswarlu
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  4. Gautam Das
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  5. Saleh N. Alhajeri
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  6. Terence G. Langdon
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Correspondence to K. Venkateswarlu.

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Patil, D.C., Kori, S.A., Venkateswarlu, K. et al. Using ball indentation to determine the mechanical properties of an Al-7475 alloy processed by high-pressure torsion. J Mater Sci 48, 4773–4779 (2013). https://doi.org/10.1007/s10853-012-6969-y

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  • DOI: https://doi.org/10.1007/s10853-012-6969-y

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