Cu-4%Ti合金の応力腐食割れ機構について

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タイトル別名
  • Stress Corrosion Cracking Mechanism of Cu-4%Ti Alloy
  • Cu 4パーセント Ti ゴウキン ノ オウリョク フショク ワレ キコウ ニ

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抄録

In previous work the authors reported that the aged Cu-4%Ti alloy showed high stress corrosion cracking susceptibility. Mainly the propagation of intergranular cracks led to the failure of this alloy. Only intergranular cracks were found in as-quenched specimens, but inter- and transgranular cracks were coexisted in aged specimens. In this work we attempt to clarify the cause of the formation of transgranular cracks in aged specimens, and to propose the stress corrosion cracking machanism for this alloy. Specimens were subjected to static tensile load in aqueous ammonia containing cupric complex ions. We obtained the following results: (1) The relation between the depth of stress corrosion cracks and the aging time at 450°C showed the maximum depth in the specimen aged for about 1 hr. (2) Chemical analysis of the corrosive solution after stress corrosion tests revealed that preferential dissolution of copper had occurred during stress corrosion process and that Ti was quite difficult to dissolve. (3) The stress corrosion cracking susceptibility of this alloy was tightly dependent on the growth of modulated structure during the aging process. The growth of the modulated structure leads the change of the ratio of anodic area to cathodic area of local corrosion cells, which influences the stress corrosion cracking susceptibility. Increasing in cathodic area accelates active anodic dissolution and enhances the atress corrosion cracking susceptibility.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 39 (5), 488-493, 1975

    公益社団法人 日本金属学会

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