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Investigation of B2 and Related Phases in Ti-Modified Nb-Al Alloys

Published online by Cambridge University Press:  25 February 2011

D.-H. Hou ,
S.S. Yang ,
J. Shyue  and
H.L. Fraser
D.-H. Hou
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University2041 College Road, Columbus, OH 43210, USA
S.S. Yang
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University2041 College Road, Columbus, OH 43210, USA
J. Shyue
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University2041 College Road, Columbus, OH 43210, USA
H.L. Fraser
Affiliation:
Dept. of Materials Science and Engineering, The Ohio State University2041 College Road, Columbus, OH 43210, USA
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Abstract

The B2 ordering and phase stability of three ordered intermetallic alloys with compositions (in at.%) of Nb-15Al-10Ti (10Ti alloy), Nb-15A1-40Ti (40Ti alloy), and Nb-15Al-25Ti (25Ti alloy) have been studied. All three alloys have the B2 crystal structure in the as-cast form. The Atom Location by Channeling Enhanced Microanalysis (ALCHEMI) technique has been employed to assess the site occupancy of these B2 alloys. The results of site occupancy are represented as Ordering Tie Lines on a ternary composition diagram. Various second phases were observed in heat treated samples. An ω-type phase was found in the 1OTi alloy in samples heat treated for 10 minutes and 4 hours at 900°C. At 800°C, orthorhombic phase was found in the 40Ti alloy while a three phase microstructure of o-phase/B2/A15 was observed in both the 10Ti and 25Ti alloys. Annealing at 1100°C leads to the dissolution of the o-phase and the presence of A15 phase in the 10Ti and 25Ti alloys, but no other phase in the 40Ti alloy. The observed phase equilibria in these alloys are compared with those in the literature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 437
Copyright
Copyright © Materials Research Society 1994

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