2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties
2Mg–Fe alloy powder produced by high-energy ball milling was processed by hot extrusion at temperatures of 200 ◦C and 300 ◦C to produce bulk samples. The alloys were hydrogenated for 24 h under hydrogen pressures of 24 bar (to produce the Mg2FeH6 phase) and 15 bar (to produce a mixture of MgH2 + Mg2...
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ri-123456789-331992021-08-17T12:48:48Z 2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties Peres, Maurício Mirdhaui Lima, Gisele Ferreira de Garroni, Sebastiano Baró, María Dolors Surinach, Santiago Kiminami, Claudio Shyinti Botta, Walter Jose Peres, Maurício Mirdhaui Jorge Junior, Alberto Moreira 2Mg–Fe alloy Hot extrusion Hydrogen storage 2Mg–Fe alloy powder produced by high-energy ball milling was processed by hot extrusion at temperatures of 200 ◦C and 300 ◦C to produce bulk samples. The alloys were hydrogenated for 24 h under hydrogen pressures of 24 bar (to produce the Mg2FeH6 phase) and 15 bar (to produce a mixture of MgH2 + Mg2FeH6 phases), respectively. After the hydrogenation treatments, the complex hydride Mg2FeH6 was identified in both conditions, while the MgH2 and MgO phases were observed only after extrusion at 200 ◦C. Desorption temperatures varied with the extrusion conditions; extrusion at 300 ◦C resulted in a desorption onset temperature about 68 ◦C lower than that of samples extruded at 200 ◦C, and about 200 ◦C lower than that of commercial MgH2. Extrusion at the lower temperature did not change the number of stored defects (point defects, dislocations, voids, stacking faults, vacancies and others) produced in the milling process and increased the preferential sites for hydride nucleation, increasing the hydrogen storage capacity. The presence of MgO produced the beneficial effect of grain boundary pinning, but delayed the onset temperature of desorption. The combined presence of MgH2 and Fe after hydrogenation at 15 bar seems to play a catalytic role that considerably hastened the Mg–H reactions and increased the desorption kinetics. However, the desorption kinetics in both conditions was still low 2021-08-17T12:48:47Z 2021-08-17T12:48:47Z 2011-06 article LIMA, Gisele F. de; GARRONI, Sebastiano; BARÓ, Maria D.; SURIÑACH, Santiago; KIMINAMI, Cláudio S.; BOTTA, Walter J.; PERES, Mauricio M.; JORGE JUNIOR, Alberto M.. 2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of mgo and mgh2 on hydrogenation sorption properties. Journal Of Alloys And Compounds, [S.L.], v. 509, p. 460-463, jun. 2011. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0925838810027921?via%3Dihub. Acesso em: 02 mar. 2021. http://dx.doi.org/10.1016/j.jallcom.2010.11.034. 0925-8388 https://repositorio.ufrn.br/handle/123456789/33199 10.1016/j.jallcom.2010.11.034 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Elsevier |
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2Mg–Fe alloy Hot extrusion Hydrogen storage |
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2Mg–Fe alloy Hot extrusion Hydrogen storage Peres, Maurício Mirdhaui Lima, Gisele Ferreira de Garroni, Sebastiano Baró, María Dolors Surinach, Santiago Kiminami, Claudio Shyinti Botta, Walter Jose Peres, Maurício Mirdhaui Jorge Junior, Alberto Moreira 2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| description |
2Mg–Fe alloy powder produced by high-energy ball milling was processed by hot extrusion at temperatures of 200 ◦C and 300 ◦C to produce bulk samples. The alloys were hydrogenated for 24 h under hydrogen pressures of 24 bar (to produce the Mg2FeH6 phase) and 15 bar (to produce a mixture of MgH2 + Mg2FeH6 phases), respectively. After the hydrogenation treatments, the complex hydride Mg2FeH6 was identified in both conditions, while the MgH2 and MgO phases were observed only after extrusion at 200 ◦C. Desorption temperatures varied with the extrusion conditions; extrusion at 300 ◦C resulted in a desorption onset temperature about 68 ◦C lower than that of samples extruded at 200 ◦C, and about 200 ◦C lower than that
of commercial MgH2. Extrusion at the lower temperature did not change the number of stored defects
(point defects, dislocations, voids, stacking faults, vacancies and others) produced in the milling process
and increased the preferential sites for hydride nucleation, increasing the hydrogen storage capacity. The
presence of MgO produced the beneficial effect of grain boundary pinning, but delayed the onset temperature of desorption. The combined presence of MgH2 and Fe after hydrogenation at 15 bar seems to play a catalytic role that considerably hastened the Mg–H reactions and increased the desorption kinetics. However, the desorption kinetics in both conditions was still low |
| format |
article |
| author |
Peres, Maurício Mirdhaui Lima, Gisele Ferreira de Garroni, Sebastiano Baró, María Dolors Surinach, Santiago Kiminami, Claudio Shyinti Botta, Walter Jose Peres, Maurício Mirdhaui Jorge Junior, Alberto Moreira |
| author_facet |
Peres, Maurício Mirdhaui Lima, Gisele Ferreira de Garroni, Sebastiano Baró, María Dolors Surinach, Santiago Kiminami, Claudio Shyinti Botta, Walter Jose Peres, Maurício Mirdhaui Jorge Junior, Alberto Moreira |
| author_sort |
Peres, Maurício Mirdhaui |
| title |
2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| title_short |
2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| title_full |
2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| title_fullStr |
2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| title_full_unstemmed |
2Mg–Fe alloys processed by hot-extrusion: influence of processing temperature and the presence of MgO and MgH2 on hydrogenation sorption properties |
| title_sort |
2mg–fe alloys processed by hot-extrusion: influence of processing temperature and the presence of mgo and mgh2 on hydrogenation sorption properties |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://repositorio.ufrn.br/handle/123456789/33199 |
| work_keys_str_mv |
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| _version_ |
1773966964575698944 |