Al-4%Cu合金の時効による電気化学的性質の変化と応力腐食割れ感受性の関係

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タイトル別名
  • Effect of Aging on Pitting and Stress-Corrosion Cracking of Al-4%Cu Alloy
  • Al 4パーセント Cu ゴウキン ノ ジコウ ニヨル デンキ カガクテキ セ

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Pitting potentials and stress-corrosion lives at constant potential of Al-4%Cu alloys with various aging structures were measured in 1M-NaCl. It was found that the alloys having higher susceptibility to stress-corrosion cracking, for example, aged at 170°C for 0.1 day, showed two pitting potentials corresponding to pitting at the grain boundary and the matrix, respectively, and became susceptible to stress-corrosion cracking in the higher potential range than the pitting potential for the grain boundary. In this case, the mode of fracture was intergranular. The susceptibility of the alloys to stress-corrosion cracking was maximum in a 1M-NaCl+1 wt%-H2O2 solution when aged to attain the largest difference in pitting potential between grain boundary and matrix. The alloys solution treated or overaged, which showed the lower susceptibility to stress-corrosion cracking, had only one pitting potential which corresponded to pitting in the matrix. These alloys were subject to stress-corrosion cracking in the higher range than the pitting potential for the matrix and showed the transgranular fracture caused by pitting of the matrix.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 39 (5), 520-528, 1975

    公益社団法人 日本金属学会

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