High temperature creep deformation of dispersion strengthened tungsten alloys for thermionic emitters

Conference · Sat Jan 09 23:00:00 EST 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

DOI:https://doi.org/10.1063/1.43075· OSTI ID:5587671

Ozaki, Y; Gao, P; Zee, R H ^[1]

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1. Materials Engineering, Auburn University, AL 36849 (United States)

The mechanism for creep deformation in dispersion strengthened tungsten alloys was examined. The effects of three dispersoids were investigated: HfC, ZrC, and ThO[sub 2]. 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.

• OSTI ID: 5587671
• Report Number(s): CONF-930103--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 271:1; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

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