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Influence of high-pressure torsion on microstructural evolution in an Al–Zn–Mg–Cu alloy

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Abstract

A commercial age-hardenable Al-7136 alloy was successfully processed by high-pressure torsion (HPT) at room temperature through 1/8 to 4 turns. Microhardness measurements showed significant hardening even after 1/8 turn with the average hardness value reaching a maximum after 1 turn and then slowly decreasing. Higher hardness values were attained by processing the alloy through one pass of equal-channel angular pressing in a supersaturated condition at room temperature and then applying HPT for 1 or 2 turns. Microstructural observations revealed the possibility of achieving true nanometer grain sizes of <100 nm after processing at room temperature. There were variations in hardness with imposed strain due to the fragmentation and subsequent growth of precipitates during processing.

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Acknowledgement

This study was supported by the National Science Foundation of the United States under Grant No. DMR-0855009.

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Authors and Affiliations

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

    Zhi Chao Duan, Megumi Kawasaki & Terence G. Langdon

  2. School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia

    Xiao Zhou Liao

  3. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    Roberto B. Figueiredo & Terence G. Langdon

Authors
  1. Zhi Chao Duan
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  2. Xiao Zhou Liao
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  3. Megumi Kawasaki
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  4. Roberto B. Figueiredo
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  5. Terence G. Langdon
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Corresponding author

Correspondence to Zhi Chao Duan.

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Duan, Z.C., Liao, X.Z., Kawasaki, M. et al. Influence of high-pressure torsion on microstructural evolution in an Al–Zn–Mg–Cu alloy. J Mater Sci 45, 4621–4630 (2010). https://doi.org/10.1007/s10853-010-4400-0

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  • DOI: https://doi.org/10.1007/s10853-010-4400-0

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