Hydrogen Storage Properties of Mg-Ni Alloys Processed by Fast Forging

Patricia de Rango, Jing Wen, Nataliya Skryabina, Laetitia Laversenne, Daniel Fruchart and Marielle Borges
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Patricia de Rango: University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France
Jing Wen: University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France
Nataliya Skryabina: Department of Physics, Perm State University, 15 Bukireva, 614990 Perm, Russia
Laetitia Laversenne: University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France
Daniel Fruchart: University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France
Marielle Borges: University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France

Energies, 2020, vol. 13, issue 13, 1-14

Abstract: Fast forging of compacts made up of Mg and Ni powders is shown to be an effective method to induce severe plastic deformation with improved H 2 sorption properties. Here, using such processed samples, a comprehensive analysis of the sorption properties reveals that the first hydrogenation sequence significantly depends on the forging temperature, through different microstructures. More in detail, no phase transformation occurs upon cold forging, while solid-state reaction leads to the formation of the Mg 2 Ni intermetallic compound upon forging above 400 °C. Forging below the brittle-to-ductile transition (225–250 °C) leads to faster H 2 uptake upon first absorption owing to a more textured fiber along the c-axis and internal strains which promote hydrogen diffusion through the bulk material. Desorption kinetics remain slower with low-temperature forging, despite Ni recombining to form Mg 2 Ni during the first desorption. After several cycles, a two-step behavior is observed with a fast absorption step occurring up to about 3 wt.%. Despite this limited uptake performance, the forging process can be considered as a straightforward, safe, and cost-efficient process to produce large amounts of Mg-based alloys for hydrogen storage. In particular, such severe plastic deformation processes can be considered as reliable substitutes for ball-milling, which is highly efficient but energy- and time-consuming.

Keywords: hydrogen storage; metal hydrides; Mg-Ni; eutectic alloys; severe plastic deformation; forging (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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