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The Effect of Aluminum on the Formation of Orthorhombic Plates in the Nb-Ti-Al Ternary System

Published online by Cambridge University Press:  15 February 2011

D. T. Hoelzer  and
F. Ebrahimi
D. T. Hoelzer
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611 *NYS College of Ceramics, Alfred University, Alfred, NY 14802
F. Ebrahimi
Affiliation:
Dept. of Materials Science and Engineering, University of Florida, Gainesville, FL 32611 *NYS College of Ceramics, Alfred University, Alfred, NY 14802
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Abstract

Transmission electron microscopy (TEM) was used to study the phase transformation in an alloy containing 33Ti-27Nb-40Al (at.%). The results showed that the BCC β phase was present at high temperatures, which ordered to the B2 phase, and finally was martensitically transformed to a plate microstructure during quenching. The plates possessed an orthorhombic crystal structure and a substructure that consisted of both coarse and fine anti-phase domain boundaries (APDBs). These APDBs were consistent with three sublattices that were derived from the inherited site occupancy of the B2 matrix and a subsequent disorder to order transition. The CBED analysis of the plates showed that the site occupancy of this orthorhombic phase was consistent with the Al2NbTi stoichiometry with Al occupying the 8g, Nb the 4c1, and Ti the 4c2 Wyckoff sites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 97
Copyright
Copyright © Materials Research Society 1997

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References

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