Temperature dependence of irradiation-induced creep in dilute nanostructured Cu–W alloys

Irradiation-induced creep (IIC) in dilute Cu–W nanostructured alloy films, 300nm thick, was measured as a function of temperature during 1.8-MeV Kr+ irradiation using plane-strain bulge testing. The creep rate increased with increasing temperature between 300K and 473K, and then became constant up t...

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Published inJournal of nuclear materials Vol. 422; no. 1-3; pp. 8 - 13
Main Authors Tai, Kaiping, Averback, Robert S., Bellon, Pascal, Ashkenazy, Yinon, Stumphy, Brad
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.03.2012
Elsevier
Subjects
Alloys
Applied sciences
Controled nuclear fusion plants
COPPER ALLOYS (40 TO 99.3 CU)
Copper base alloys
Creep (materials)
CREEP PROPERTIES
Dilution
DISLOCATIONS
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Fuels
Installations for energy generation and conversion: thermal and electrical energy
IRRADIATION
MICROSTRUCTURES
Nanostructure
Nuclear fuels
RADIATION
Scanning electron microscopy
Thick films
Grain size
Scanning electron microscopy
Creep
Enthalpy
Microstructure
Steady state
Grain boundary
Nuclear reactor
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Summary:Irradiation-induced creep (IIC) in dilute Cu–W nanostructured alloy films, 300nm thick, was measured as a function of temperature during 1.8-MeV Kr+ irradiation using plane-strain bulge testing. The creep rate increased with increasing temperature between 300K and 473K, and then became constant up to 573K. An activation enthalpy of 0.30±0.05eV was obtained for Cu93.5W6.5 and Cu99W1 alloys. Thermal creep, in absence of irradiation, became comparable to IIC at 573K. Primary and secondary creep were observed at all temperatures. The steady state creep rate was proportional to the applied stress. Subsequent (scanning) transmission electron microscopy analysis revealed a high density of small (2–3nm) W-rich nanoparticles with BCC structure after irradiation at all temperatures, but no dislocation loops. The average grain size of the irradiated alloys was stabilized at ∼30–40nm in both alloys. Correlations between the microstructures and creep behaviors are discussed in terms of grain boundary creep mechanisms.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2011.11.068