Abstract
X-ray photoelectron spectroscopy (XPS) and micro-hardness measurements were combined to study the effect of Nb doping on the high temperature environmental interactions of α 2-Ti 3Al intermetallic alloys with pure oxygen and oxygen/nitrogen gas mixtures. The XPS data show a pre-oxidation stage in the first minutes of low pressure exposure to the gaseous environments at 650 °C, characterized by the absence of oxidation of the metal constituents of the alloy, the adsorption on the surface, and the sub-surface penetration of atomic oxygen and nitrogen. The XPS measurements of the surface and sub-surface concentrations reveal the effect of niobium on the surface adsorption of oxygen and nitrogen and on sub-surface penetration, showing that nitrogen is disfavored. The micro-hardness data show a bulk effect of niobium that counteracts the near-surface embrittlement caused by the penetrating environmental elements. The surface and bulk effects of niobium combine to mitigate the embrittlement of the material by nitrogen.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
