Phase Transformations in Nb-Al-Ti Alloys
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Authors
Menon, E.S.K.
Subramanian, P.R.
Dimiduk, D.M.
Subjects
Advisors
Date of Issue
1996
Date
Publisher
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Abstract
Phase relationships as well as morphological and crystallographic features in Nb-rich Nb-Al and Nb-Al-Ti alloys have been investigated. The phase boundaries involving the bcc and Nb3Al (A15 structure) were experimentally determined and several isothermal sections of the Nb-rich corner of the Nb-AI-Ti phase diagram established. The present findings show that (a) the solubility of Al in Nb is considerably less than that reported previously, (b) the high-temperature bcc phase undergoes an ordering transformation to the B2 structure, and (c) the ω phase also forms in these alloys. The sequence of decomposition of the high-temperature bcc phase during isothermal decomposition in the bcc + Nb3Al phase field has been systematically studied in these alloys. A wide variety of morphological features were found to be associated with the Nb3Al precipitates that formed in the bcc/B2 matrix during isothermal heat treatments. The lengthening kinetics of the plate-shaped Nb3Al precipitates were also studied.
Type
Article
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
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NPS Report Number
Sponsors
Funder
Air Force Contract No. F33615-90-C-5944
Air Force Contract No. F33615-91-C-5663
Air Force Contract No. F33615-91-C-5663
Format
14 p.
Citation
Menon, E. S. K., P. R. Subramanian, and D. M. Dimiduk. "Phase transformations in Nb-Al-Ti alloys." Metallurgical and Materials Transactions A 27.6 (1996): 1647-1659.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.