The mechanism for creep deformation in dispersion strengthened tungsten alloys was examined. The effects of three dispersoids were investigated: HfC, ZrC, and ThO2. High temperature creep data (up to 2400 K) in these materials were analyzed based on a model that reflects the presence of dispersion carbide particles. The strengthened tungsten creeps in accordance with a dislocation process with the dispersed particles imposing a back stress. Results obtained from this model are in accord with other studies of similar materials systems. Based on this effort, critical controlling parameters were identified. Lifetime predictions were made for conditions appropriate for thermionic emitters using different creep models. It is evident that the proper selection of the model is critical to the accuracy of such predictions.
High temperature creep deformation of dispersion strengthened tungsten alloys for thermionic emitters
Proceedings of the tenth symposium on space nuclear power and propulsion ; 1993 ; Albuquerque, New Mexico (USA)
AIP Conference Proceedings ; 271 , 1 ; 63-68
1993-01-10
6 pages
Conference paper
Electronic Resource
English
HAFNIUM ALLOYS , TUNGSTEN BASE ALLOYS , DIFFUSION , THORIUM OXIDES , TEMPERATURE RANGE 1000−4000 K , STRESSES , DISPERSIONS , MICROSTRUCTURE , DEFORMATION , SPACE POWER REACTORS , REINFORCED MATERIALS , ZIRCONIUM CARBIDES , SERVICE LIFE , DISLOCATIONS , THERMIONIC EMITTERS , THERMIONIC FUEL ELEMENTS , TERNARY ALLOY SYSTEMS , CREEP , HAFNIUM CARBIDES
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