Environmental embrittlement and hydrogen diffusion in Co{sub 3}Ti alloys
- Shanghai Univ. (China)
Takasugi et al. have investigated the susceptibility to environmental embrittlement in Co{sub 3}Ti doped with 0, 1,000, 2,000 wppmB, and found that Co{sub 3}Ti is intrinsically ductile and has high grain boundary strength, but Co{sub 3}Ti is very susceptible to environmental conditions. Boron (1,000 wppm or 2,000 wppm) doping into Co{sub 3}Ti alloys does not have the effect of suppressing the environmental embrittlement. They have also found that boron in Co{sub 3}Ti shows a very weak tendency to segregate into grain boundaries. They suggest that when boron atoms segregate to the grain boundaries, and thereby reduce grain boundary diffusion of hydrogen, while when boron atoms do not segregate, or little segregate, to the grain boundaries, boron atoms do not reduce hydrogen diffusion along grain boundaries. However, there is still a lack of hydrogen diffusion data in Co{sub 3}Ti alloy to support this mechanism. Therefore, the major objective of this work is to measure the hydrogen diffusivity in Co{sub 3}Ti and to understand the principal factors affecting intergranular hydrogen embrittlement of Co{sub 3}Ti alloys.
- OSTI ID:
- 541019
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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