Orientation Dependence of Fatigue Crack Propagation in Magnesium Single Crystals

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  • Ando Shinji
    Department of Materials Science and Engineering,Graduate School of Science and Technology, Kumamoto Univerisity
  • Ikejiri Yukishige
    Department of Materials Science, Graduate School of Science and Technology, Kumamoto Univerisity
  • Iida Naomi
    Department of Materials Science and Engineering,Graduate School of Science and Technology, Kumamoto Univerisity
  • Tsushida Masayuki
    Faculty of Engineering, Kumamoto University
  • Tonda Hideki
    Department of Materials Science and Engineering,Graduate School of Science and Technology, Kumamoto Univerisity

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Other Title
  • マグネシウム単結晶における疲労き裂進展の結晶方位依存性

Abstract

  The fatigue crack propagation behavior of pure magnesium single crystals has been investigated in laboratory air at room temperature. Two types of CT specimens with different notch orientations were prepared from the magnesium single crystal made by the Bridgeman technique. Fatigue crack propagation behaviors of each specimen were different related to notch orientation. In the case of C-specimen with (1010)[0001] notch, a crack was inclined to (0001) gradually at low ΔK. To investigate crack propagation behavior along [0001], a tri-crystal specimen in which has (1010)[0001] notch was prepared. A crack propagated to [0001] in this specimen and the fatigue surface shows striation-like pattern. In the case of E-specimen with (0001)[1010] notch, a crack propagates parallel to basal plane. {1012} twin occurred in front the crack at higher ΔK level. A fatigue surface of the E-specimen was changed by {1012} twin formation.<br>

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