Joint Interface Microstructure of A4045/A3003/A4045 Alloy Clad Strips Fabricated by Vertical-type Tandem Twin-roll Casting

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  • Nakamura Ryoji
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Tanaka Yuichi
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Haga Toshio
    Department of Mechanical Engineering, Faculty of Engineering, Osaka Institute of Technology
  • Harada Yohei
    Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Kumai Shinji
    Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

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Other Title
  • タンデム式縦型双ロールキャスト法で作製したA4045/A3003/A4045合金クラッド材の接合界面組織
  • タンデムシキ タテガタソウロールキャストホウ デ サクセイ シタ A4045/A3003/A4045 ゴウキン クラッドザイ ノ セツゴウ カイメン ソシキ

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Abstract

<p>  The vertical-type tandem twin-roll caster is able to produce clad strips from molten alloys by single step. The caster consists of two twin roll casters arranged vertically. The base strip produced at the upper caster is led to the roll gap of the lower caster and the solidifying shell of the overlay alloy grown from the roll surface of the lower caster sandwiches the base strip and produced the clad strip. In the present study, a three-layered aluminum alloy clad strip of A4045/A3003/A4045 was fabricated. Microstructure observation and composition analysis under various magnifications from the optical microscopic-to transmission electron microscopic-order were performed. Both OM and SEM observations found fine solidification structure of both alloy strips. The joint interface was flat and no alloyed region was observed at the interface. A thin layer of about 1μm in thickness including neither Al-Mn base nor eutectic Si particles, was observed at the joint interface. Orientation analysis and chemical composition measurement using TEM and STEM-EDS revealed that the crystal orientation of thin layer took over that of each grain of A3003 and the composition was comparable to the α-Al matrix of A4045. This indicates that the thin layer was the solidified shell of A4045 grown epitaxially from the strip surface of A3003.</p>

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