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High Temperature Deformation of a Nb-Ti-Al Alloy With σ+γ Microstructure

Published online by Cambridge University Press:  22 February 2011

Fereshteh Ebrahimi  and
Bernardo J. G. DeAragao
Fereshteh Ebrahimi
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
Bernardo J. G. DeAragao
Affiliation:
CpqD-Telebras, Campinas, Brazil
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Abstract

An alloy with composition 27Nb-33Ti-40Al (at. %) was heat treated to produce a fine two-phase microstructure of σ (Nb2Al) and γ (TiAl) phases. This microstructure exhibited a peak in the flow curves obtained in the strain rate range 5 × 10−4 to 5 × 10−6s−1 at 1000°C, with a stress exponent of 3. The deformation occurred by dislocation activity and twinning accompanied by dynamic recrystallization of the γ-phase and extensive grain boundary sliding of the σ-phase, which resulted in the separation and fragmentation of the latter phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1247
Copyright
Copyright © Materials Research Society 1995

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