Severely deformed ZK60+2.5% Mm alloy for hydrogen storage produced by two different processing routes

Autor(es)

Soyama, Juliano ^[1] ; Floriano, Ricardo ^[2] ; Leiva, Daniel Rodrigo ^[1] ; Guo, Yaofeng ^[1] ; Jorge Junior, Alberto Moreira ^[1] ; da Silva, Erenilton Pereira ^[3] ; Pinto, Haroldo Cavalcanti ^[3] ; Bolfarini, Claudemiro ^[1] ; Kiminami, Claudio Shyinti ^[1] ; Botta, Walter Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Fac Ciencias Aplicadas, Rua Pedro Zaccaria, BR-13484350 Limeira - Brazil

^[3] Univ Sao Paulo, Escola Engn Sao Carlos, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 41, n. 26, p. 11284-11292, JUL 13 2016.
• Citações Web of Science: 8

Resumo

In this investigation the commercial ZK60 magnesium alloy modified with 2.5 wt.% of mischmetal was processed by melt spinning (MS) and equal-channel angular pressing (ECAP), both followed by extensive cold rolling (CR). The results indicate that MS was effective to produce small grain sizes in the order of 700 nm, while specimens prepared only by ECAP reached about 50 mu m. However, melt spun ribbons showed long activation (first hydrogenation) times of more than 30 h in contrast to ECAP, which took about 10 h. In addition, after the activation process, the hydrogen storage capacity of ECAP was poorer than MS (2.5 and 3.3 wt.% of H-2, respectively). Additional processing by CR caused further grain refinement and breakage of intermetallic particles, as well as favoring crystallographic texture in the (002) direction. All these features promoted a significant improvement in the hydrogen storage capacity, and in the absorption kinetics of the specimens processed by MS and ECAP. (c) 2016 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