Low-Temperature and High-Strain-Rate Superplasticity of Ultrafine-Grained A7075 Processed by High-Pressure Torsion

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  • Lee Seungwon
    Department of Materials Science and Engineering, University of Toyama
  • Watanabe Katsumi
    Department of Materials Science and Engineering, University of Toyama
  • Matsuda Kenji
    Department of Materials Science and Engineering, University of Toyama
  • Horita Zenji
    Department of Materials Science and Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (I<sup>2</sup>CNER), Kyushu University

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<p>An A7075 alloy was processed by high-pressure torsion (HPT) under an applied pressure of 6 GPa for 1, 3 and 5 revolutions with a rotation speed of 1 rpm at room temperature. Vickers microhardness saturated to a level of 220 Hv after the HPT processing and the grain size was refined to ∼120 nm at the state of the hardness saturation. Tensile tests were conducted with initial strain rates from 2.0 × 10−2 to 2.0 × 10−4 s−1 at a temperature in the range of 200–400°C. It was shown that high-strain rate superplasticity (>1.0 × 10−2 s−1) and/or low-temperature superplasticity (0.5–0.6Tm) occurred in the HPT-processed A7075 alloy, where the superplasticity deformation is controlled by grain boundary sliding through grain boundary diffusion.</p>

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 59 (8), 1341-1347, 2018-08-01

    公益社団法人 日本金属学会

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