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Surface effects on hydrogen permeation through Ti-14Al-21Nb alloy

Author
Sankaran, Sandara N.
Published
Apr 1, 1991.
Physical Description
1 electronic document
Additional Creators
Outlaw, Ronald A. and Clark, Ronald K.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Hydrogen transport through Ti-14Al-21Nb (wt percent) alloy is measured using ultrahigh vacuum permeation techniques over the temperature range of 500 to 900 C and hydrogen pressure range of 0.25 to 10 torr. Hydrogen permeability through the alloy can be described through two different mechanisms depending on th temperature of exposure. In the 675 to 900 C range, the process is diffusion-limited: the permeability has a weak temperature dependence, but the diffusivity has a strong temperature dependence. Below 675 C, the permeation rate of hydrogen is very sensitive to surface controlled processes such as the formation of a barrier layer from contaminants. A physical model explaining the role of surface films on the transport of hydrogen through Ti-14Al-21Nb alloy was described.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19910010953.
Accession ID: 91N20266.
NAS 1.60:3109.
L-16826.
NASA-TP-3109.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15681989