Al-Zn-Mg-Cu合金における巨大クローム金属間化合物について

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タイトル別名
  • “Giant” Chromium Intermetallic Compounds and Stress Corrosion Cracking in Al-Zn-Mg-Cu Alloys
  • Al-Zn-Mg-Cu ゴウキン ニ オケル キョダイ クローム キンゾク カン カゴウブツ ニ ツイテ
  • “Giant” Chromium Intermetallic Compounds and Stress Corrosion Cracking in Al-Zn-Mg-Cu Alloys

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It is well known that very coarse crystals, up to 2 mm in length, found in large extrusions of 7075 alloy, have been identified as primary crystals of CrAl7 which grew under semi-continuous casting, and have caused the decrease in fatigue strength.<BR>Experiments were carried out to make a study of the prevention of the occurrence of “giant” chromium compounds without decreasing the resistance to stress corrosion cracking in Al-Zn-Mg-Cu alloys.<BR>The results obtained are as follows:<BR>(1) When the Cr content is less than 0.23% in Al-5.5%Zn-2.5%Mg-1.6%Cu alloy, the occurrence of “giant” chromium compounds is suppressed in commercial practice. However, the addition of >0.3%Mn, >0.3%Fe or >0.05%Ti promotes their occurrence.<BR>(2) The addition of Zr 0.1% has no influence on the occurrence of “giant” chromium compounds, and the addition of 0.2 to 0.3%Zr prevents their occurrence. It might be due to the increase in solubility of Cr in the Al-matrix caused by the formation of primary crystals of ZrAl3 before CrAl7 at a higher temperature.<BR>(3) It is concluded that Al-Zn-Mg-Cu alloy containing both 0.2%Cr and 0.1%Zr is a material having an excellent resistance to stress corrosion cracking, without fear of the occurrence of “giant” intermetallic compounds in industrial production.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (2), 102-107, 1964

    公益社団法人 日本金属学会

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