Título

NANOSTRUCTURED MAGNESIUM HYDRIDE PREPARED BY COLD ROLLING AND COLD FORGING

NANOSTRUCTURED MAGNESIUM HYDRIDE PREPARED BY COLD ROLLING AND COLD FORGING

Autoria

Leiva, Daniel; Huot, Jacques; Jorge, Alberto; Ishikawa, Tomaz; Botta, Walter

Leiva, Daniel

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Huot, Jacques

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Jorge, Alberto

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Ishikawa, Tomaz

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Botta, Walter

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DOI

10.5151/2594-5327-35721

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Resumo

Magnesium is a promising material for solid state hydrogen storage, since it has low cost and its hydride can store reversibly up to 7.6 wt. % of hydrogen. Fast H-sorption kinetics at around 300°C can be achieved after processing Mg-based mixtures by high-energy ball milling (HEBM), which produces nanostructured composite powders. Severe plastic deformation (SPD) techniques are being explored as an alternative to HEBM in order to obtain more air-resistant materials and reduce processing times. In this work, Mg, MgH2 and MgH2-Fe mixtures were severely mechanically processed by extensive cold forging and cold rolling. A very significant grain refinement (to around 10 nm) was achieved using MgH2 instead of Mg as raw material. Enhanced H-sorption kinetics properties were observed for these mechanically processed MgH2-based nanocomposites. These results are promising since it reveals the potential of using low cost mechanical processing routes to produce Mg-based nanomaterials for hydrogen storage.

Magnesium is a promising material for solid state hydrogen storage, since it has low cost and its hydride can store reversibly up to 7.6 wt. % of hydrogen. Fast H-sorption kinetics at around 300°C can be achieved after processing Mg-based mixtures by high-energy ball milling (HEBM), which produces nanostructured composite powders. Severe plastic deformation (SPD) techniques are being explored as an alternative to HEBM in order to obtain more air-resistant materials and reduce processing times. In this work, Mg, MgH2 and MgH2-Fe mixtures were severely mechanically processed by extensive cold forging and cold rolling. A very significant grain refinement (to around 10 nm) was achieved using MgH2 instead of Mg as raw material. Enhanced H-sorption kinetics properties were observed for these mechanically processed MgH2-based nanocomposites. These results are promising since it reveals the potential of using low cost mechanical processing routes to produce Mg-based nanomaterials for hydrogen storage.

Palavras-chave

Magnesium is a promising material for solid state

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