Synthesis of beta-Ti-Nb alloys from elemental powders by high-energy ball milling and their hydrogenation features

Autor(es)

de Araujo-Silva, R. ^[1] ; Neves, A. M. ^[1] ; Vega, L. E. R. ^[1] ; Triques, M. R. M. ^[1] ; Leiva, D. R. ^[1] ; Kiminami, C. S. ^[1] ; Ishikawa, T. T. ^[1] ; Jorge Junior, A. M. ^[1] ; Botta, I, W.

Afiliação do(s) autor(es)

^[1] I, Univ Fed Sao Carlos, Dept Engn Mat, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 43, n. 39, p. 18382-18391, SEP 27 2018.
• Citações Web of Science: 3

Resumo

The body-centered cubic (BCC or beta) titanium alloys are attractive materials for hydrogen storage applications, due to their relatively high absorption capacities that can be attained in some cases, even at room or moderate temperatures. It is known that the ball milling techniques improve the H-absorption/desorption kinetics. Thus, different compositions with Ti/Nb atomic ratios of 1.0, 1.5 and 2.3 were prepared by mechanical alloying (MA) and reactive milling (RM), and the composition effects on the microstructure and the hydrogenation properties were characterized. Both procedures, MA and RM, were able to produce TixNb1-x BCC alloys. It was observed a significant influence of Ti/Nb atomic ratios on lattice parameters, crystallite and particle sizes, effective kinetic parameter, Avrami exponent, hydrogen storage capacities, reversibility, and desorption temperature ranges. The RM synthesized hydrides acquired better H-absorption/desorption properties than the Ti-Nb hydrides produced by mechanical alloying hydrogenated at 250-300 degrees C. The results demonstrated changes in the hydride nucleation manner and improvement of the hydrogenation rates when the Nb addition is increased. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático