Abstract
The oxidation behavior of a ductile TiNb particle reinforced Ti-48A1 (at. pct) system was studied at different temperatures. The objective of this work was to establish the role played by the TiNb reinforcement on the oxidation process. The activation energy for oxidation of Ti-48A1 was 324 kJ/mol and that of Ti-48Al-20 vol pct TiNb was 315 kJ/mol. The kinetics of oxidation of both the material systems are similar. At 982 °C, the outermost oxide layer in contact with air was always near stoichiometric TiO2. In all the alloys, a layer of porosity was created just below the outer TiO2 layer by the Kirkendall mechanism as a result of the rapid outward dif-fusion of Ti atoms. TiNb particles are more oxidation resistant than Ti-48A1. The boundary of the TiNb particles was oxidized to form TiO2. However, most of the TiNb particles were un-touched and existed as islands embedded within the Ti and Al oxides formed by oxidation of Ti-48A1. Oxidation in pure oxygen lowers the oxidation kinetics, as compared to oxidation in pure air for identical gas flow rates at 982 °C.
Sign-in/Register to access full text options 
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.
