High-temperature creep behavior of second-phase particle-strengthened tungsten-rhenium alloys
The creep behavior of W{sup {minus}4}Re{sup {minus}0}.26HfC, W{sup {minus}3}.6Re{sup {minus}1}ThO{sub 2}, W{sup {minus}11}Re{sup {minus}1}ThO{sub 2}, and W{sup {minus}26}Re{sup {minus}1}ThO{sub 2} alloys were evaluated at elevated temperatures (between 1955 and 2500 K) in a custom-built high vacuum creep testing facility. These alloys are promising emitter materials for the Thermionic Energy Converter. The effects of stress and temperature on the creep rate of these alloys were determined and the stress exponents and creep activation energies of these alloys were measured. Results showed that HfC particles have a very high strengthening effect on the W{sup {minus}4}Re matrix up to 2200 K. At temperatures higher than 2200 K the coarsening rate of HfC is so high that they lose their strengthening effect rapidly. Comparing the creep strength of the arc-melted W{sup {minus}4}Re{sup {minus}0}.26HfC with that of the P/M W-Re{sup {minus}1}ThO{sub 2} alloys, it was found that at temperatures less than or equal to 2200 K, W{sup {minus}4}Re{sup {minus}0}.26HfC has the highest creep.
- Research Organization:
- Arizona State Univ., Tempe, AZ (United States)
- OSTI ID:
- 5408941
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ACTINIDE COMPOUNDS
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CREEP
DATA
EXPERIMENTAL DATA
HAFNIUM CARBIDES
HAFNIUM COMPOUNDS
HIGH TEMPERATURE
INFORMATION
MECHANICAL PROPERTIES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHENIUM ALLOYS
TEMPERATURE EFFECTS
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS
TUNGSTEN BASE ALLOYS