Tensile tests on titanium alloy, following abrasion under hydrogen and temperature cycling, reveal lowered tensile strength, increased ductility, and no embrittlement. Fretting the metal on itself in flowing hydrogen or abrading with an iron file in flowing hydrogen produces titanium hydride

Chandler, W. T.

Hensley, W. E.

English

NASA Technical Reports Server

September 1970	 Brief 70-10366 
NASA TECH BRIEF H 
NASA Tech Briefs announce new technology derived from the U .S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Effects of Hydrogen on ELI Titanium Alloy Ti 5A1 2.5Sn 
The effects are reported of hydrogen on ELI tita-
nium alloy Ti-5Al-2.5Sn under three sets of condi-
tions.
1. Tensile tests followed abrasion under hydrogen, 
and temperature cycling between -423° and either 
400° or 800°F. The metal was abraded with titanium, 
lnconel-718, 440-C, Tens-50 aluminum, A-286, or iron 
files. These treatments lowered the tensile strength 
by :^21%, and increased ductility by 38.7% as meas-
ured by reduction in area. These effects are believed 
to be too great to reflect data scatter only. Effects of 
abrasion in air or helium were similar. The tensile 
tests revealed no evidence of embrittlement. Gas anal-
yses and electron and light microscopy of the failed 
specimens showed no absorption of hydrogen, no for-
mation of TiH 2 , and no evidence of brittle fracture. 
2. When the metal was fretted on itself in flowing 
hydrogen at ambient temperature and pressure, a 
powder formed that was identified as TiH-,. It is pro-
posed that the fretting between two surfaces so raised 
the surface temperature that enough hydrogen was 
absorbed to form the hydride. The same fretting in air 
formed TiN and TiO powders.
3. When the metal was abraded with an iron file in 
flowing hydrogen at 400° or 800°F, TiH formed on 
the surface. Here the ambient temperature was high 
enough for absorption of sufficient hydrogen for for-
mation of the hydride phase in the metal structure. 
Notes: 
1. This information may interest the aircraft industry, 
fabricators in titanium, and manufacturers and 
users of containers or handling equipment for cry-
ogenic liquids and gases. 
2. Requests for further information may be directed 
to:
Technology Utilization Officer 
Code A&TS-TU 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: TSP70- 10366 
Patent status: 
No patent action is contemplated by NASA. 
Source: W. E. Hensley and W.T. Chandler of 
North American Rockwell Corporation 
under contract to 
Marshall Space Flight Center 
(MFS-18815) 
Category 04 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administiation. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned-rights.
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Effects of hydrogen on ELI titanium alloy Ti-5Al-2.5Sn

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