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Séminaire MCMF

Jeudi 27 février 2014 à 14h30,
Salle Erwin Bertaut, F418

Orateur : Simeon NACHEV, Institut Néel.
"Mechanical behavior and microstructure evolution of MgH2 composites during hydrogen cycling"

Metal hydrides offer an efficient solution for storing hydrogen gas under solid state, in order to use it as a new energy carrier. Magnesium hydride (MgH2) is abundant, cheap, and presents a high specific energy (2.4 kWh/kg). The co-milling process of MgH2 with transition metals (V, Ti-V-Cr alloys) is now well mastered and highly reactive powders are produced at large scale with perfectly stable sorption properties. Nevertheless, a progressive swelling of the compacted disks prepared from ball-milled MgH2 is observed upon cycling, depending on additives composition. This phenomenon is an important challenge for the industrial applications of these materials.
In the first part, we will present the results of the stress quantification as function of the nature and the quantity of used additives. The second part will be devoted to the analysis of the mechanical properties, grain size and microstructure evolutions.

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