Creep and Corrosion Properties of the Extruded Magnesium Alloy Containing Rare Earth

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Effects of microstructures on the creep and corrosion properties were investigated in the Mg-8Al alloys with addition of the rare earth elements (La-rich Mischmetal, RE). The addition of RE to Mg-8Al alloy may form a stable intermetallic phase, Al<SUB>11</SUB>RE<SUB>3</SUB> at elevated temperature, and suppress the β phase (Mg<SUB>17</SUB>Al<SUB>12</SUB>) with poor stability at high temperature. The corrosion rate of the alloy slightly decreases with increasing the added RE contents. The constant-load creep behavior was examined at 423, 448 and 473 K under stresses between 40 and 100 MPa. The RE-containing alloy showed a prolonged period of stead-state creep compared to the Mg-8Al base alloy and slightly reduced minimum creep rates. A stress exponent of 2 estimated suggests that the creep behavior can be controlled by the grain boundary sliding. The apparent activation energy for creep of Mg-8Al and Mg-8Al-2RE alloys are 114 and 104 kJ mol<SUP>−1</SUP>, respectively.

収録刊行物

  • Materials transactions  

    Materials transactions 48(2), 265-272, 2007-02-01 

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10018508983
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    13459678
  • NDL 記事登録ID
    8623912
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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