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

Energies

Nataliya Skryabina¹  Jing Wen²  Marielle Borges²  Patricia de Rango²  Daniel Fruchart²  Laetitia Laversenne² 

[1] Department of Physics, Perm State University, 15 Bukireva, 614990 Perm, Russia;University Grenoble Alpes, CNRS, Institut Néel, 38000 Grenoble, France;

关键词: hydrogen storage;    metal hydrides;    Mg-Ni;    eutectic alloys;    severe plastic deformation;    forging;   

DOI  :  10.3390/en13133509

来源: DOAJ

【 摘 要 】

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 H₂ 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 Mg₂Ni intermetallic compound upon forging above 400 °C. Forging below the brittle-to-ductile transition (225–250 °C) leads to faster H₂ 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 Mg₂Ni 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.

【 授权许可】

Unknown