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Stress-Assisted Discontinuous Precipitation during Creep of Ti3Al-Nb Alloys

Published online by Cambridge University Press:  26 February 2011

R.G. Rowe  and
E.L. Hall
R.G. Rowe
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301,
E.L. Hall
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301,
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Abstract

Stress-assisted discontinuous precipitation was observed during creep of Ti- 25Al-12.5Nb at.% and associated with microstructures in which large primary creep strains were observed [1]. It was found that a large shift between the equilibrium βo (B2) phase composition at the heat treatment temperature and disordered β(bcc) phase at the creep temperature provided a driving force for discontinuous precipitation of disordered beta phase. Applied stress accelerated the growth of discontinuous β phase at grain boundaries perpendicular to the principal stress axis, but did not produce a significant shift in composition. The difference between beta and ordered beta phase boundaries in the Ti-Al-Nb system at 650°C and 1040°C suggests that discontinuous precipitation or related dissolution should occur in all Ti3Al-Nb alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 449
Copyright
Copyright © Materials Research Society 1991

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References

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