Thermal fatigue of Zircaloy‑4 cladded U‑7.5Nb‑2.5Zr
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Prototype plates made of U-7.5Nb-2.5Zr alloy, also known as Mulberry alloy, cladded with Zircaloy-4 were thermally
fatigued between 200 ºC and 500 ºC investigated. The assembly consisting of a Uranium alloy monolithic core and the
Zircaloy-4 cladding was processed by hot rolling and investigated in the “as rolled” state, as well as after applying 9% and
18% reduction in cold rolling. The samples were characterized by Optical microscopy and X-Ray diffraction both before and
after the thermal cycling. All samples presented strong volume contraction (shrinkage) in the first thermal cycle, observed
concomitantly with the γ → α" transformation. The relative shrinkage varied with the cold rolling level, being larger for the
“as rolled” plate. The failure mechanism observed in all plates was fracture alongside the U-alloy/Zircaloy-4 interface and
no transverse crack was observed either in the Zircaloy-4 sheet or in the Uranium core.
Como referenciar
MORAIS, NATHANAEL W.S.; MONLEVADE, EDUARDO F.; SCHON, CLAUDIO G. Thermal fatigue of Zircaloy‑4 cladded U‑7.5Nb‑2.5Zr. Polytechnica, v. 7, p. 1-7, 2024. Suppl 1. DOI: 10.1007/s41050-023-00042-y. Disponível em: https://repositorio.ipen.br/handle/123456789/48038. 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.