Ａｌ‐Ｍｇ‐Ｓｉ系合金の大気中低ひずみ速度変形時に生じる環境脆化

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  • 倉本 繁
    東京大学大学院工学系研究科材料学専攻
  • 謝 明君
    東京大学大学院工学系研究科材料学専攻
  • 菅野 幹宏
    東京大学大学院工学系研究科材料学専攻

書誌事項

タイトル別名
  • Environmental embrittlement of Al-Mg-Si base alloys deformed at low strain rates in laboratory air.
  • Al-Mg-Si系合金の大気中低ひずみ速度変形時に生じる環境脆化
  • Al Mg Siケイ ゴウキン ノ タイキ チュウ テイヒズミ ソクド ヘンケイジ ニ ショウジル カンキョウゼイカ

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抄録

Two medium-strength Al–Mg–Si alloys exhibited environmental embrittlement when deformed in laboratory air at low strain rates. Tensile specimens prepared from hot rolled plates of Al–0.75%Mg–0.75%Si and Al–0.75%Mg–0.75%Si–0.35%Cu alloys were solution treated for 1 h at 540°C, quenched in water and aged for 30 min at 175°C. They were deformed in tension at initial strain rates ranging from 1.7 × 10−7 to 8.3 × 10−4 s−1 in a laboratory air with a relative humidity of 40–80%. Both alloys showed ductile transgranular fracture when tested at a strain rate of 8.3 × 10−4 s−1, however, they exhibited intergranular embrittlement with lower tensile elongation and reduction in area when tested at a strain rate of 1.7× 10−7 s−1. This tendency of intergranular embrittlement is prominent in the Al–0.75%Mg–0.75%Si–0.35%Cu alloy and the effect of hydrogen absorbed from the test environment on such embrittlement was studied using deuterium as a tracer of hydrogen.

収録刊行物

  • 軽金属

    軽金属 52 (6), 250-255, 2002

    一般社団法人 軽金属学会

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