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Synthesis of Nanostructured TiFe Hydrogen Storage Material by Mechanical Alloying via High‐Pressure Torsion
Author(s) -
Gómez Edgar Ignacio López,
Edalati Kaveh,
Antiqueira Flávio José,
Coimbrão Diego Davi,
Zepon Guilherme,
Leiva Daniel Rodrigo,
Ishikawa Tomaz Toshimi,
Cubero-Sesin Jorge M.,
Botta Walter José
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000011
Subject(s) - materials science , ingot , intermetallic , severe plastic deformation , hydrogen storage , metallurgy , hydrogen , titanium , torsion (gastropod) , chemical engineering , grain size , medicine , chemistry , surgery , organic chemistry , alloy , engineering
TiFe as a room‐temperature hydrogen storage material is usually synthesized by ingot casting in the coarse‐grained form, but the ingot needs a thermal activation treatment for hydrogen absorption. Herein, nanograined TiFe is synthesized from the titanium and iron powders by severe plastic deformation (SPD) via the high‐pressure torsion (HPT). The phase transformation to the TiFe intermetallic is confirmed by X‐ray diffraction, hardness measurement, scanning/transmission electron microscopy, and automatic crystal orientation and phase mappings (ASTAR device). It is shown that the HPT‐synthesized TiFe can store hydrogen at room temperature with a reasonable kinetics, but it still needs an activation treatment. A comparison between the current results and those achieved on high activity of HPT‐processed TiFe ingot suggests that a combination of ingot casting and SPD processing is more effective than synthesis by SPD to overcome the activation problem of TiFe.