Growth Manner of Intermetallic Compounds at the Weld Interface of Steel/Aluminum Alloy Lap Joint Fabricated by a Defocused Laser Beam

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  • Lee Kwang-Jin
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Kumai Shinji
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Kawamura Naonori
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Ishikawa Nobuhiro
    High Voltage Electron Microscopy Station, National Institute of Materials Science
  • Furuya Kazuo
    High Voltage Electron Microscopy Station, National Institute of Materials Science

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説明

An interrupted welding method was performed in order to investigate the formation and growth manner of IMC at the weld interface of steel/aluminum alloy lap joint during defocused laser beam welding. Microstructural transition at the weld interface was precisely investigated by both TEM diffraction pattern analysis and TEM-EDX chemical composition analysis. It was revealed that Al13Fe4 and Al2Fe formed at the early stage of welding process, and the formation of Al5Fe2 subsequently occurred between Al13Fe4 and Al2Fe. Preferential and abrupt growth of Al5Fe2 resulted in the IMC layer which was composed of coarse Al5Fe2 and Al13Fe4. The dominant factor controlling the interfacial microstructure is considered to be the post-welding thermal history. Increase of energy density gave rise to an increment of the IMC layer thickness, and brought about reduced bonding strength. Therefore, lower energy input (higher welding speed when other welding conditions are fixed) is considered to be useful in order to suppress the abrupt grain growth of the IMCs in the layer which possibly occurred during the post-welding thermal history.

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