Orientation Dependence of High-Angle Grain Boundary Formation during Sliding Wear in Copper Single Crystals

  • Ohno Yoshihiro
    R&D Center, JTEKT Corporation
  • Inotani Junichi
    Department of Intelligent Materials Engineering, Faculty of Engineering, Graduate School of Engineering, Osaka City University
  • Kaneko Yoshihisa
    Department of Intelligent Materials Engineering, Faculty of Engineering, Graduate School of Engineering, Osaka City University
  • Hashimoto Satoshi
    Department of Intelligent Materials Engineering, Faculty of Engineering, Graduate School of Engineering, Osaka City University

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Other Title
  • 銅単結晶のすべり摩擦にともなう大角粒界形成の結晶方位依存性
  • ドウタンケッショウ ノ スベリ マサツ ニ トモナウ ダイカク リュウカイ ケイセイ ノ ケッショウ ホウイ イソンセイ

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Abstract

  Sliding wear tests were conducted on copper single crystals having (110) and (111) surface, and polycrystalline copper. Evolution of high-angle grain boundaries during the sliding wear was investigated by the electron backscatter diffraction (EBSD) technique. The high-angle grain boundaries, which were formed in the vicinity of the worn surface, could be classified into two kinds from their morphology: one is parallel to the worn surface (Type A high-angle boundary) and the other is a grain boundary surrounding an equiaxed fine grain (Type B high-angle boundary). At Type A high-angle boundaries, a rotational axis between adjoining grains was almost parallel to z-axis which is defined as the direction perpendicular to both wear direction and worn surface normal. Grain boundary character distribution of Type A boundaries was sensitive to crystallographic orientation of the z-axis. When the z-axis was <110>, orientation relationship of Σ33a had high frequency. On the other hand, high Σ31a frequency was obtained at the sliding wear occurring under <111> z-axis condition. It is concluded that the evolution of Type A boundaries was caused by lattice rotation induced by sliding wear. For Type B high-angle boundaries, fractions of low-Σ coincident site lattice (CSL) boundaries were high, and the frequency distribution of CSL boundaries was almost independent of wear direction and worn surface orientation. Unlike Type A boundaries, rotational axes at Type B boundaries showed no preferred orientation. These crystallographic features suggest that recrystallization is the most plausible origin for Type B boundary evolution. Consequently, the high-angle boundaries were produced probably by two different processes during sliding wear.<br>

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