Creep Fracture of Copper Tricrystal along Grain Boundaries

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  • Okada Tatsuya
    Division of Science and Technology, Tokushima University
  • Hisazawa Hiromu
    Division of Science and Technology, Tokushima University
  • Morimoto Hiroki
    Graduate School of Advanced Technology and Science, Tokushima University
  • Nakao Kazuki
    Graduate Schools of Science and Technology for Innovation, Tokushima University
  • Okubo Ryuta
    Graduate Schools of Science and Technology for Innovation, Tokushima University
  • Ueki Tomoyuki
    Division of Science and Technology, Tokushima University

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<p>The major objective of the present study was to investigate the creep fracture process of a copper tricrystal having ⟨110⟩-tilt Σ3, 3, 9 grain boundaries. Creep tests at 0.81 TM (TM: melting temperature on the absolute temperature scale) under 4 MPa tensile stress were carried out for three samples prepared from the same tricrystal. Grain-boundary sliding occurred along only the Σ9 boundary, and the triple junction of the boundaries completely suppressed the sliding. The three samples were in different stages of creep deformation. Creep fracture was initiated by sliding-induced voids along the Σ9 boundary. Grain-boundary damage by the void formation developed into complete separation along the Σ9 boundary, and the Σ9 boundary crack induced surface grooves along one of the Σ3 boundaries, arranged almost perpendicular to the tensile axis. The crack propagation resulted in the final fracture of the tricrystal along the Σ9 and Σ3 boundaries. The formation of cavities in the Σ3 fracture surface suggested that the final fracture occurred in a ductile manner after the neighboring grains were partly separated along the Σ3 boundary.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (8), 1133-1137, 2022-08-01

    公益社団法人 日本金属学会

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