Fatigue Properties of Mg-Zn-Y Alloys with Long Period Orderd Structure

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  • Ando Shinji
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto Univerisity
  • Toda Kazuaki
    Department of Materials Science, Graduate School of Science and Technology, Kumamoto Univerisity
  • Tsushida Masayuki
    Faculty of Engineering, Kumamoto University
  • Kitahara Hiromoto
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto Univerisity
  • Tonda Hideki
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto Univerisity
  • Kawamura Yoshihito
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto Univerisity

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Other Title
  • 長周期構造型Ｍｇ‐Ｚｎ‐Ｙ系合金の疲労破壊特性
  • 長周期構造型Mg-Zn-Y系合金の疲労破壊特性
  • チョウシュウキ コウゾウガタ Mg Zn Yケイ ゴウキン ノ ヒロウ ハカイ トクセイ

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Abstract

  Recently, Mg-Zn-Y alloys with high strength and good ductility, which have a long period order (LPO) structure, have been developed. Therefore, it is important to understand fundamental fatigue properties in such materials. In this study, the fatigue fracture behavior of Mg96-Zn2-Y2 (two phase) alloy was investigated using a plain fatigue bending testing machine, which was originally developed for thin sheet specimen. One end of the sheet specimen is fixed at a voice coil of the loudspeaker and the other end is set free. A bending mode resonance at a frequency of 250-700 Hz occurs in the specimen due to forced vibration at the fixed end. A S-N curve for Mg96-Zn2-Y2 alloy was obtained and the fatigue limit was estimated as about 180 MPa. The value corresponds to about 45% of 0.2% proof strength of the alloy. Two types of fatigue surface were observed in the alloy. One is striation like pattern and the other is relatively flat surface. For comparison of fatigue behavior, Mg88-Zn4-Y7 (LPO single phase) and Mg99.2-Zn0.2-Y0.6 (α-Mg single phase) alloys were also investigated. Fatigue limit of each alloys were 220 MPa and 140 MPa, respectively. Striation like pattern was also observed in fatigue surface of both alloys. These results show that a fatigue crack in Mg-Zn-Y alloys propagates with activation of basal slip at the crack tip.<br>

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