Dispersion Strengthening of High Temperature Niobium Alloys

Niobium base alloys are very attractive as high temperature materials for advanced gas turbine applications. After many conventional metallurgical approaches, a high temperature creep resistant alloy has yet to be identified which will replace nickel base superalloys. The best chance for obtaining h...

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Bibliographic Details
Main Authors: Anton, D L, Snow, D B, Giamei, A F
Format: Report
Language:English
Subjects:
ALLOYS
CREEP
CREEP STRENGTH
DISPERSION HARDENING
DISPERSIONS
EXPOSURE(GENERAL)
Fabrication Metallurgy
GAS TURBINES
HEAT RESISTANT ALLOYS
HIGH STRENGTH
HIGH TEMPERATURE
MATERIALS
METALLURGY
NICKEL ALLOYS
NIOBIUM
NIOBIUM ALLOYS
PARTICLES
PE61102F
PRECIPITATES
Properties of Metals and Alloys
QUICK REACTION
RAPID SOLIDIFICATION
REFRACTORY METALS
SOLIDIFICATION
STABILITY
STRENGTH(MECHANICS)
SUPERALLOYS
TEMPERATURE
THERMODYNAMICS
WUAFOSR2306A1
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Summary:Niobium base alloys are very attractive as high temperature materials for advanced gas turbine applications. After many conventional metallurgical approaches, a high temperature creep resistant alloy has yet to be identified which will replace nickel base superalloys. The best chance for obtaining high temperature creep resistance in these alloys is through dispersion strengthening with a stable precipitate that is introduced through rapid solidification. This would result in a very fine dispersion of nonshearable precipitates that would not coarsen upon long term exposure at temperatures in excess of 1200 C. A study has been conducted here to identify such a stable dispersion, fabricate alloys through a rapid solidification approach and characterize the coarsening of the resulting precipitates. A thermodynamic argument is presented to select candidate dispersions for evaluation. Keywords: Niobium, Dispersion strengthening, High temperature strength, Creep particle coarsening, Refractory metals.