Abstract
Specimens of V–4Ti alloy with Ti-enriched surfaces were prepared by heating in vacuo, and the influence of segregating Ti on H2 absorption was examined at temperatures from 473 to 1023 K under the presence of water vapor of 10-5 Pa. The rate of H2 absorption was significantly reduced by surface segregation of Ti in the temperature range examined. Such reduction in the absorption rate was ascribed to the increase in surface coverage of oxygen caused by oxidation of Ti by water vapor. It was concluded that Ti segregating to the surfaces provides a favorable barrier effect against the ingress of hydrogen isotopes.
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