- Author
-
Buzzard, R. J.
|
Sheffler, K. D.
- Title
- Effect of Long-Time, Elevated-Temperature Exposures to Vacuum and Lithium on the Properties of a Tantalum alloy, T-111.
- Coporate
- NASA Lewis Research Center, Cleveland, OH
- Sponsor
- National Aeronautics and Space Administration, Washington, DC
- Report
-
NASA TN D-7548
March 1974
33 p.
- Keywords
-
metals
|
alloys
|
vacuum effects
|
lithium
|
mechanical properties
|
nuclear reactors
|
exposure
- Identifiers
- tantalum alloy
- Abstract
- The purpose of this study was to determine the effect of ong-term, elevated-temperature vacuum and lithium exposures on the mechanical properties of T-111 (Ta-8W-2Hf). Exposure conditions were for 1000 hours at 980 deg or 1315 deg C, 5000 hours at 1315 deg C, and a duplex temperature exposure of 1000 hours at 980 deg C plus 4000 hours at 1040 deg C. The exposures resulted in reduced tensile and creep strengths of the T-111 in the 900 deg to 1100 deg C temperature range where a dynamic strain-age-strengthening mechanism is operativein this alloy. This strength reduction was attributed to the depletion of oxygen from solid solution in this alloy.