Influence of grain size on the high-temperature creep behaviour of M5Framatome1 zirconium alloy under vacuum - Archive ouverte HAL Access content directly
Journal Articles Journal of Nuclear Materials Year : 2022

Influence of grain size on the high-temperature creep behaviour of M5Framatome1 zirconium alloy under vacuum

Abstract

The effect of grain size on the viscoplastic behaviour of M5Framatome zirconium alloy thin sheets was investigated at high temperature under uniaxial tension, using a variety of equiaxed microstructures with controlled grain sizes. In the α phase domain, a Coble diffusional creep regime and a dislocation creep regime were observed, in agreement with the literature. A negative sensitivity of the strain rate to temperature was highlighted in the upper part of the α+β two-phase temperature range, consistently with the literature. For the first time, a linear creep regime was evidenced in the β phase domain. In this regime, a sensitivity of the strain rate on the third power of the grain size is observed, suggesting a Coble regime with diffusion along grain boundaries. Modelling with multi-mechanism Norton power-law rate equations, including dependence on grain size and a homogenous strain-rate assumption (Taylor model), enabled to satisfactorily reproduce the experimental results over the 700–1100 °C temperature range, especially the negative sensitivity of the strain rate to temperature between 880 and 930 °C. Very good agreement was obtained with a second order self-consistent and full field homogenization schemes.
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Dates and versions

hal-03517768 , version 1 (26-02-2022)

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G. Trego, J.C. Brachet, V. Vandenberghe, L. Portier, L. Gélébart, et al.. Influence of grain size on the high-temperature creep behaviour of M5Framatome1 zirconium alloy under vacuum. Journal of Nuclear Materials, 2022, 560, pp.153503. ⟨10.1016/j.jnucmat.2021.153503⟩. ⟨hal-03517768⟩
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