Statistical Approach for Understanding the Effect of Specimen Size on the Yield Stress and Its Scattering in Mechanically-Alloyed Cu and ODS-Cu Obtained by Micro-Pillar Compression Test

  • Liu Yuchen
    Institute for Materials Research, Tohoku University Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University
  • Kondo Sosuke
    Institute for Materials Research, Tohoku University
  • Yu Hao
    Institute for Materials Research, Tohoku University
  • Yabuuchi Kiyohiro
    Institute of Advanced Energy, Kyoto University
  • Kasada Ryuta
    Institute for Materials Research, Tohoku University

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Abstract

<p>Oxide Dispersion Strengthening copper (ODS-Cu) alloy has high strength, high thermal conductivity and superior irradiation resistance which are needed for fusion reactor divertor components. In this study, specimen size dependence of the yield stress in Cu and ODS-Cu which were made by mechanical alloying and hot pressing was investigated by micro-pillar compression test. The distributions of yield stress values were different between the sizes, 1, 3 and 5 µm cubic micro-pillars, which can be explained by the inhomogeneous spatial distributions of both the crystallographic grain in matrix and oxide-particles.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 61 (5), 955-962, 2020-05-01

    The Japan Institute of Metals and Materials

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