Journal
CORROSION SCIENCE
Volume 180, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109198
Keywords
Titanium; EPMA; SEM; STEM; XRD; Oxidation
Funding
- inter-university cooperative research program (Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University) [18G0418, 19G0411]
- Japan Society for the Promotion of Science [20K14619]
- Grants-in-Aid for Scientific Research [20K14619] Funding Source: KAKEN
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The addition of Nb significantly improves the oxidation resistance of Ti-based alloys without significantly affecting their tensile properties. This enhancement is mainly attributed to the substitution of Ti4+ by Nb5+ in TiO2 and the promotion of a Sn-rich layer formation.
Previous research has inadequately elucidated the influence of Nb addition on the tensile properties and oxidation resistance of Ti-based alloys. Herein, the tensile properties and oxidation resistance of Ti-6Al-2Sn-4Zr-2Mo-0.1Si-1.0B-xNb (x = 0, 0.2, and 1.0) alloys were investigated. The oxidation resistance was significantly improved by Nb addition without significantly influencing the tensile properties. The substitution of Ti4+ by Nb5+ in TiO2 and promoted formation of a Sn-rich layer between the oxidation layer and substrate caused an increase in the oxidation resistance, thus highlighting the effectiveness of Nb addition in enhancing the oxidation resistance.
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