High-temperature deformation of Sr(FeCo){sub 1.5}O{sub x} ceramics

Compressive creep of polycrystalline SrFe{sub 1.2}Co{sub 0.3}O{sub x} and SrFeCo{sub 0.5}O{sub x} ceramics has been investigated at 940-1000 C in constant-load and constant-displacement-rate experiments. At low stresses, the stress exponent was {approx}1 and the activation energy was {approx}110-135...

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Published inActa materialia Vol. 49; no. 2001
Main Authors de Arellano-Lopez, A. R., Balachandran, U., Goretta, K. C., Ma, B., Routbort, J. L., Energy Technology, Univ. de Sevilla
Format Journal Article
LanguageEnglish
Published United States 01.01.2001
Subjects
ACTIVATION ENERGY
CERAMICS
CREEP
DEFORMATION
DIFFUSION
DISLOCATIONS
FLOW STRESS
MATERIALS SCIENCE
OXYGEN
PARTIAL PRESSURE
STRESSES
TRANSMISSION ELECTRON MICROSCOPY
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Summary:Compressive creep of polycrystalline SrFe{sub 1.2}Co{sub 0.3}O{sub x} and SrFeCo{sub 0.5}O{sub x} ceramics has been investigated at 940-1000 C in constant-load and constant-displacement-rate experiments. At low stresses, the stress exponent was {approx}1 and the activation energy was {approx}110-135 kJ/mol. At higher stresses, a transition occurred and the stress exponent became {approx}2.4-3.1 and the activation energy became {approx}425-453 kJ/mol. At higher stresses, there was no dependence of the steady-state flow stress on oxygen partial pressure from 10-10{sup 5} Pa. The creep parameters and scanning and transmission electron microscopy observations of the deformed samples suggested that deformation was controlled by diffusion at low stresses and dislocation glide at high stresses.
Bibliography:DE-AC02-06CH11357
ANL/ET/JA-40706
FOR
NETL
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(01)00164-1