Local Melting and Cracking during Friction Stir Spot Welding on Mg-Al binary Alloy

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著者

    • HORIE S.
    • Department of Mechanical System Engineering, Graduate School of Engineering, Hiroshima University
    • YAMAMOTO M.
    • Department of Mechanical System Engineering, Graduate School of Engineering, Hiroshima University
    • SHINOZAKI K.
    • Department of Mechanical System Engineering, Graduate School of Engineering, Hiroshima University
    • NORTH T. H.
    • Department of Materials Science and Engineering, University of Toronto
    • GERLICH A.
    • Department of Chemical & Engineering, University to Alberta

抄録

Local melting and cracking are investigated during friction stir spot welding of binary Mg-Al alloys containing from 3% to 23% Al by using a combination of stir zone temperature, rotational torque and detailed metallographic. The stir zone temperatures during Mg-15%Al and Mg-23%Al alloys friction stir spot welding correspond with the (α-Mg + Mg<sub>17</sub>Al<sub>12</sub>) eutectic temperature in the binary Mg-Al equilibrium phase diagram. The stir zone microstructures of friction stir spot welds in Mg-15%Al and Mg-23%Al alloys comprise fine equiaxed α phases and Mg<sub>17</sub>Al<sub>12</sub>. Narrow stir zones and lower rotational torques are observed when Mg-15%Al and Mg-23%Al alloys are spot welded since energy generation is diminished by tool slippage due to existing eutectic liquid at contact interface. These results support that local melting of the (α-Mg + Mg<sub>17</sub>Al<sub>12</sub>) eutectic microstructure occurred at the contact interface between the tool surface and material when the stir zone temperature attained to the eutectic temperature in the binary Mg-Al equilibrium phase diagram.<br>Liquation cracking is observed in the location beneath the tool shoulder in friction stir spot welds of Mg-9%Al alloy. The crack surface morphology is formed of dendrite shape. It is confirmed that the cracking occurred during Mg-9%Al alloy friction stir spot welding is liquation cracking.

収録刊行物

  • 溶接学会論文集 : quarterly journal of the Japan Welding Society

    溶接学会論文集 : quarterly journal of the Japan Welding Society 27(2), 94s-98s, 2010-01-20

    一般社団法人 溶接学会

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各種コード

  • NII論文ID(NAID)
    10030148955
  • NII書誌ID(NCID)
    AN1005067X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    02884771
  • データ提供元
    CJP書誌  J-STAGE 
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