| Autor: |
H.E. Rosinger, P.C. Bera, W.R. Clendening |
| Rok vydání: |
1979 |
| Předmět: |
|
| Zdroj: |
Journal of Nuclear Materials. 82:286-297 |
| ISSN: |
0022-3115 |
| DOI: |
10.1016/0022-3115(79)90011-4 |
| Popis: |
Steady-state creep rates of as-received zircaloy-4 fuel cladding have been determined from 940 to 1073 K in the α-Zr range, from 1140 to 1190 K in the mixed (α + β) phase region and from 1273 to 1873 K in the β-Zr phase region. Strain rates of between 10−6 and 10−2/s were determined under constant uniaxial load conditions. Assuming that creep rates can be described by a power law-Arrhenius equation, the creep rate for α-phase zircaloy-4 is given by: ge ss = 2000 σ 5.32 exp (−284 600/kT) s −1 ; for the β-phase zircaloy-4 by: ge ss = 8.1 σ 3.79 exp (−142 300/kT) s −1 ; and for the mixed (α + β) phase of zircaloy-4 (for creep rates ⩽3 × 10−3 s−1) by: ge ss = 6.8 × 10 −3 σ 1.8 exp (−56 600/kT) s −1 . For the both the α and β phases, the activation energies for creep are in agreement with those of self-diffusion. For the mixed (α + β) phase region, the low creep rate range is controlled by grain boundary sliding at the α/(α + β) phase boundary. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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