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Influence of Interstitial Oxygen on the Lattice Parameters of Solution-Treated and Aged Ti-8.6 wt% Al Alloys

Published online by Cambridge University Press:  21 February 2011

G. T. Gray III  and
A. C. Lawson
G. T. Gray III
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico87545
A. C. Lawson
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico87545
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Abstract

Neutron powder diffraction data have been obtained on Ti-8.6wt.% Al alloys with three different oxygen contents ( 500, 1000, and 2000 ppm) in the solution-treated and aged condition ( containing α2) to investigate possible oxygen and aluminum ordering and lattice parameter variations. The lattice parameters “a” and “c” were found to depend on the oxygen content and heat-treatment condition. Consistent with the literature lattice parameter data on pure Ti, the “a” lattice parameter of the solution-treated Ti-8.6Al material is relatively insensitive to the oxygen content while the “c” parameter increases with increasing oxygen. Following aging to precipitate the ordered α2, the “c” lattice parameter in the Ti-8.6Al alloys still exhibits a positive dependence on oxygen content with aging and a slight “c” increase over the solution-treated condition. The “a” lattice parameter following aging is observed to be lower than the solution-treated value, particularly for the 1000 and 2000ppm alloys. The diffraction data will be discussed in light of parallel electron microscopy results and literature data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 261
Copyright
Copyright © Materials Research Society 1990

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References

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