Microstructural characterization of U-7,5Nb-2,5Zr alloy after ageing and constrained fatigue
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2022
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
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Resumo
U-7,5Nb-2,5Zr cladded in zircaloy-4 is one of the most studied fuel prototypes. The Nb and Zr are
added to the U to stabilize the BCC gamma phase and grant mechanical and swelling resistance.
The U-7,5Nb-2,5Zr undergoes the gamma to alpha" phase transformation, generating compressive
stresses due to the volume reduction. The alpha" phase also can transform to a combination of
alpha+gamma2 phase (equilibrium phases), which are known to be hard and brittle. This work has
the objective to test the effect of ageing the gamma to alpha" phase in thermal cycling of a U-
7,5Nb-2,5Zr cladded in zircaloy-4 piece. A co-limited specimen was aged and thermally cycled in a
dilatometry experiment. The samples were characterized through X-ray diffraction and
metallography. The results show that the gamma to alpha" phase transformations occur at the
beginning of the initial ageing, followed by stress relief. During the cycling, the sample
demonstrated non-equal thermal strains and presented fractures along with the U matrix.
Como referenciar
MORAIS, N.W.; SCHON, C.G.; ROSSI, J.L.; FABRIM, Z.E.; MUCSI, C.S. Microstructural characterization of U-7,5Nb-2,5Zr alloy after ageing and constrained fatigue. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33788. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.