923 Ti および Ti 合金の環境脆化マップ

概要

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Titanium and titanium-aluminum alloys suffer degradation of mechanical properties by hydrogen entering from wet environments, so called, environment-assisted cracking (EAC). In order to make sure the environmental conditions for the mechanical degradation of the materials (i.e., to construct environmental degradation map), EAC behavior of Ti, Ti-6Al-4V, and TiAl was investigated under controlling electrochemical potential as well as pH of the solution. In the cases of TiAl and Ti-6Al-4V, the severest EAC was found under low pH and around -1.0 V_<SHE>, whereas the conditions of low pH and potential lower than -1.0 V_<SHE> made the EAC moderate. Ti demonstrated no EAC susceptibility under any test conditions, but showed the largest hydrogen entry and hydride formation under the low pH and around -1.0 V_<SHE>. The potential-pH region where the severest EAC was found was in good agreement with the Ti ion stable region in the potential-pH diagram for Ti/H_2O system.
社団法人日本機械学会の論文
2003-09-23