Furukawa-Sky Review No.1 (April 2005)

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Effects of Microstructural Features of Grain Boundary on the Bendability of Al-Mg-Si Alloy Sheets

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  • 檜室 義幸
    Yoshiyuki Himuro
  • 小山 克己
    Katsumi Koyama


Al-Mg-Si alloys are increasingly being used in automotive sheet applications because they show age hardening during the paint-bake process. The alloy sheets are usually solution-treated and quenched for good age-hardening performance, natural-aged at room temperature, then press-formed before paint-bake aging. For outer panels, one of the important requirements for these alloys is their ability to resist fracture during bending. In this study, the effects of grain boundary precipitates and width of precipitate free zone (PFZ) on the bendability of natural-aged alloy sheets were investigated. Five types of quenching patterns including step-quenching technique were experimented after solution treatment to control these microstructural features. A lot of precipitates, which resulted from slow cooling and step-quenching at high temperatures, facilitated the initiation of cracks at grain boundaries during bending eventually tending to decrease the bendability. The influence of the PFZ width on intergranular fractures was quite small in this alloy. These results suggest that suppressing grain boundary precipitation is one of the key techniques to improve the bendability.

一般論文 / Articles

  1. 飲料用アルミニウム缶材料の開発
    Development of Aluminum Beverage Can Stocks
  2. Al-Mg-Si合金板材の曲げ加工性に及ぼす粒界組織の影響
    Effects of Microstructural Features of Grain Boundary on the Bendability of Al-Mg-Si Alloy Sheets
  3. Al-Mg合金板の降伏応力異方性に及ぼすミクロ組織と転位セル壁配列の影響
    Effects of Microstructure and Arrangement of Dislocation Cell Walls on the Yield Stress Anisotropy in Al-Mg Alloy Sheets

  4. ろう付加熱時のろう侵食に及ぼすブレージングシートの焼鈍条件の影響
    Effect of Annealing Conditions of Brazing Sheet on Erosion during Brazing
  5. Al-Siろう材合金中のSiサイズによるろう付性の変化
    Change in the Brazeability of Brazing Sheets with Different Si Particle Size in Al-Si Filler Alloy Layer
  6. アルミニウム合金鋳塊におけるバットカール現象のシミュレーション解析
    Numerical Simulation of Butt Curl Phenomena during Aluminum DC Casting

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