Abstract
The oxidation kinetics of the Ti 3Al based alloys with Nb (0 to 20 at%) or Si (0 to 15 at%) addition was carefully measured at 800 and 900°C, respectively. The oxide scale was characterised by high temperature in-situ XRD, SEM, EPMA and conventional XRD. The weight gains of the alloys were greatly reduced by Nb or Si addition. The improvement of the oxidation resistance in the Ti 3Al alloys by Nb addition is attributed to the formation of a compact scale. The formation of a compact scale is favoured not only by doping effect but also by the TiN layer which barriers the outward Al diffusion into the scale to form porous intermixed titania/alumina. Si addition promotes the formation of a compact TiO 2 layer in the oxide scale and the formation of SiO 2, thus the oxidation resistance of the Ti 3Al based alloys is improved. The oxidation behaviour of the alloys with Si addition is a combinative function of the α 2-Ti 3Al matrix and the Ti 5Si 3 silicide phase.
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.
