Abstract
The as-quenched and the aged form of theω phase in Ti-Nb alloys were examined using high-resolution dark field electron microscopy and diffraction. The as-quenchedω morphology was shown to be based upon rows of equiaxed particles which are 12 to 20A in diameter and spaced 20 to 22A apart. After short aging times the row length increased, and eventually the isolated rows were replaced by clusters of rows. With continued aging the clusters increased in size and evolved into an ellipsoidal shape. The as-quenched Ti-18 at. pct Nb alloy exhibited sharpω reflections and {111} planes of diffuse intensity in reciprocal space. As the niobium content of the alloy increased theω reflections broadened, and in alloys containing 34 at. pct Nb or more, the 0001 and 0002ω reflections were shifted toward each other along an 〈0001〉 direction. The forbidden 10–10 and 20–20ω reflections were shown to be real in aged alloys, indicating that the aged form of theω phase is ordered.
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.
