Abstract
Based on measuring the depth of IG fracture surface of cathodically hydrogen precharged tensile specimens, the hydrogen diffusion coefficients in boron-free and boron-doped Co 3Ti alloys were obtained. The results show that the boron-free and boron-doped Co 3Ti alloys have almost the same apparent hydrogen diffusion coefficient, indicating that boron does not affect the hydrogen diffusivity in Co 3Ti alloys. The fact that boron-doped Co 3Ti are susceptible to moisture-induced environmental embrittlement is attributed to the fact that boron atoms do not segregate, or little segregate, to its grain boundaries.
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