| Full text | |
| Author(s): |
Floriano, R.
[1]
;
Leiva, D. R.
[2]
;
Melo, G. C.
[2]
;
Ishikawa, T. T.
[2]
;
Huot, J.
[3]
;
Kaufman, M.
[4]
;
Figueroa, S. J. A.
[5]
;
Mendoza-Zelis, L. A.
[6]
;
Damonte, L. C.
[6]
;
Botta, W. J.
[2]
Total Authors: 10
|
| Affiliation: | [1] Univ Estadual Campinas, Fac Ciencias Aplicadas, Rua Pedro Zaccaria 1300, BR-13484350 Limeira, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Engn Mat DEMA, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Quebec Trois Rivieres, Inst Rech Hydrogene, 3351 Blvd Forges, CP 500, Trois Rivieres, PQ G9A 5H7 - Canada
[4] Colorado Sch Mines, Dept Met & Mat Engn, 1500 Illinois St, Golden, CO 80401 - USA
[5] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, Rua Giuseppe Maximo Scolfaro 10000, BR-13083970 Campinas, SP - Brazil
[6] Univ Nacl La Plata, Fac Ciencias Exactas, Dept Fis, IFLP, CC67, RA-1900 La Plata, Buenos Aires - Argentina
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 42, n. 49, p. 29394-29405, DEC 7 2017. |
| Web of Science Citations: | 4 |
| Abstract | |
The hydrogen storage properties of a commercial AZ91 magnesium alloy were investigated after processing by cold rolling in two different conditions: (a) extensive cold rolling at room temperature (CR); (b) rolling with the immersion of the alloy in liquid nitrogen bath after 05 rolling passes. This second condition is named as low temperature rolling (LTR). A full microstructural characterization including scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), X-ray photoelectron and positron annihilation life time spectroscopy (XPS and PALS) were performed in the processed alloys. The hydrogen storage properties were measured using a Sievert-type apparatus. The AZ91-alloy is composed by the beta-Mg and Mg17Al12 phases, and after processing by CR, an intense peak broadening and strong {[}002] texture were observed in the alloys. The LTR processing resulted in a more fragile material containing more microcracks and exposed interfaces than the conventionally cold rolled one. The LTR sample also presented a more refined microstructure in comparison with CR sample. These features resulted in superior hydrogen storage properties for the LTR sample in comparison with the CR sample. In addition, the effect of surface contamination was also studied in detail and it was found to play a significant role during the activation kinetics. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys |
| Grantee: | Claudio Shyinti Kiminami |
| Support Opportunities: | Research Projects - Thematic Grants |