Abstract
To reduce the solution oxygen content in the matrix and enhance the ductility of Ti alloys prepared by powder metallurgy, YH2 was added as an additive to the Ti-Nb-Ta alloy in this work. By adding 1.5 wt%YH2, the compressive ductility increased 49 %, when the compression yield strength decreased slightly at room temperature, but the compression yield strength increased 41 % at 800°C compared with Ti-Nb-Ta without YH2 addition. With increase of YH2 content, the solution oxygen content in both α and β phases decreased significantly, while the proportion of ductile β phase increased. Addition of YH2 led to in situ formation of Y2O3 particles, reducing the solution oxygen content and changing the distribution state of oxygen. It is revealed that under a same deformation degree at 800°C, the dislocation density in the (Ti-5 Nb-15 Ta)-1.5 Y alloy sample is much higher than in the Ti-5 Nb-15 Ta alloy, which is attributed to a strong hindering effect of Y2O3 particles on dislocation movement. Thus, the strength of (Ti-5 Nb-15 Ta)-1.5 Y alloy was enhanced under high temperature. This study provided a new method for enhancing room temperature ductility and high-temperature strength of powder metallurgy Ti alloys.
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.
