Hydrogen desorption/absorption properties of the extensively cold rolled β Ti-40Nb alloy
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International Journal of Hydrogen Energy
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β Ti-Nb BCC alloys are potential materials for hydrogen storage in the solid state. Since
these alloys present exceptional formability, they can be processed by extensive cold
rolling (ECR), which can improve hydrogen sorption properties. This work investigated the
effects of ECR accomplished under an inert atmosphere on H2 sorption properties of the arc
melted and rapidly solidified β Ti40Nb alloy. Samples were crushed in a rolling mill producing
slightly deformed pieces within the millimeter range size, which were processed by
ECR with 40 or 80 passes. Part of undeformed fragments was used for comparison purposes.
All samples were characterized by scanning electron microscopy, x-ray diffractometry,
energy-dispersive spectroscopy, hydrogen volumetry, and differential scanning
calorimetry. After ECR, samples deformed with 40 passes were formed by thick sheets,
while several thin layers composed the specimens after 80 passages. Furthermore, deformation
of β Ti-40Nb alloys synthesized samples containing a high density of crystalline
defects, cracks, and stored strain energy that increased with the deformation amount and
proportionally helped to overcome the diffusion's control mechanisms, thus improving
kinetic behaviors at low temperature. Such an improvement was also correlated to the
synergetic effect of resulting features after deformation and thickness of stacked layers in
the different deformation conditions. At the room temperature, samples deformed with 80
passes absorbed ~2.0 wt% of H2 after 15 min, while samples deformed with 40 passes
absorbed ~1.8 wt% during 2 h, excellent results if compared with undeformed samples
hydrogenated at 300 C that acquired a capacity of ~1.7 wt% after 2 h. The hydrogen
desorption evolved in the same way as for absorption regarding the deformation amount,
which also influenced desorption temperatures that were reduced from ~270 C, observed for the undeformed and samples deformed with 40 passes, to ~220 C, for specimens rolled
with 80 passes. No significant loss in hydrogen capacity was observed in the cold rolled
samples.
Como referenciar
ARAUJO-SILVA, R.A. de; JORGE JUNIOR, A.M.; VEGA, L.E.R.; LEAL NETO, R.M.; LEIVA, D.R.; BOTTA, W.J. Hydrogen desorption/absorption properties of the extensively cold rolled β Ti-40Nb alloy. International Journal of Hydrogen Energy, v. 44, n. 36, p. 20133-20144, 2019. DOI: 10.1016/j.ijhydene.2019.05.211. Disponível em: http://repositorio.ipen.br/handle/123456789/30435. Acesso em: 20 Mar 2026.
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.