High temperature materials technology research for advanced thermionic systems. Quarterly progress report, March 1, 1995--June 30, 1995

Technical Report · Fri Dec 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/148615· OSTI ID:148615

Zee, R H ^[1]; Rose, M F ^[2]

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1. Auburn Univ., AL (United States)
2. Space Power Inst. (United States)

The concept of shift factor was used successfully to develop a model which described the role of solid solution atoms in dispersion strengthened tungsten alloys. This shift factor separates the solid solution strengthening effect of Re in the creep of W-Re-HfC materials. The creep of the alloys is expressed by the modified Lagneborg`s creep model in the following form: {dot {var_epsilon}} = A`(b/G{sup 3}kT)D{sub L}exp({minus} 580000eC{sup 1/2}/T)({sigma} {minus}{sigma}{sub p}){sup 4} (1955 K{le}T{le}2500 K), where D{sub L} is the lattice diffusion coefficient of tungsten.

• Research Organization: Auburn Univ., AL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG03-93SF19645
• OSTI ID: 148615
• Report Number(s): DOE/SF/19645--T11; ON: DE96002886
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
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DISPERSION HARDENING
HAFNIUM CARBIDES
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RHENIUM ALLOYS
TUNGSTEN BASE ALLOYS
ZIRCONIUM CARBIDES