Effect of quenching rate on microstructure formation in Al-Zn-Mg alloy sheet

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  • Aisu Yuki
    Research & Development Center, Marketing & Technology Division, UACJ Corporation
  • Ichitani Koji
    Research & Development Center, Marketing & Technology Division, UACJ Corporation
  • Tanaka Hiroki
    Research & Development Center, Marketing & Technology Division, UACJ Corporation
  • Saito Genki
    Department of Materials Physics, Graduate School of Engineering, Nagoya University
  • Muto Shunsuke
    Department of Materials Physics, Graduate School of Engineering, Nagoya University Advanced Measurement Technology Center, Institute of Materials and Systems for Sustainability, Nagoya University
  • Okajima Toshihiro
    Aichi Synchrotron Radiation Center, Aichi Science & Technology Foundation

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Other Title
  • Al-Zn-Mg合金の微細組織形成に及ぼす焼き入れ速度の影響
  • Al-Zn-Mg ゴウキン ノ ビサイ ソシキ ケイセイ ニ オヨボス ヤキ イレ ソクド ノ エイキョウ

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Abstract

<p>A phenomenon that Al-6.0%Zn-0.75%Mg alloy sheets furnace-cooled after solution heat treatment had higher strength than water-quenched sheets under specific aging condition was reported. However, the strengthening mechanism related to furnace-cooling had been not clarified yet. In this research, replication test of the strengthening phenomenon of furnace-cooled sheets and the microstructural change during natural aging and artificial aging at 200°C after furnace-cooling after solution heat treatment was investigated by tensile tests, SAXS measurements, STEM observation and electrical conductivity measurement. The strengthen phenomenon of furnace-cooled sheets was reproduced. In as-furnace-cooled sheets, 2-5 nm clusters which induced lattice strain were observed in LAADF-STEM image apart from atomic number contrast in HAADF-STEM image. The clusters seemed to be generated during furnace cooling. The clusters seemed to cause suppression of reversion and promotion of age hardening in furnace-cooled material.</p>

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