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

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NSTL

外文摘要：© 2021The 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.

外文关键词：

Constitutive modellingCreepGrain sizeHomogenizationMicrostructureZirconium alloys

作者：

Trego G.、Brachet J.C.、Vandenberghe V.、Portier L.、Gelebart L.、Chosson R.、Soulacroix J.、Forest S.、Gourgues-Lorenzon A.F.

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作者单位：

MINES Paris-PSL University Centre des Matériaux UMR CNRS 7633

出版年：

2022

DOI：

10.1016/j.jnucmat.2021.153503

Journal of Nuclear Materials

EISCI

ISSN：0022-3115

年,卷(期)：2022.560

参考文献量83