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High-pressure torsion of TiFe intermetallics for activation of hydrogen storage at room temperature with heterogeneous nanostructure

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The paper of Prof. Zenji Horita and Prof. Etsuo Akiba (I2CNER Hydrogen Storage Research Division) were published in “International Journal of Hydrogen Energy” on March 7, 2013.

 

■ Summary

TiFe is a potential candidate for the stationary hydrogen storage systems, but it requires initial activation to absorb hydrogen. This study shows that TiFe processed by high-pressure torsion (HPT) absorbs and desorbs 1.7 wt.% hydrogen at room temperature without activation. The absorption pressure decreases from 2 MPa in the first hydrogenation cycle to 0.7 MPa in the latter cycles. The HPT-processed TiFe exhibits heterogeneous microstructures composed of nanograins, coarse-grains, amorphous-like phases and disordered phases with a high hardness of ∼1050 Hv.

 

■ Paper

Title: High-pressure torsion of TiFe intermetallics for activation of hydrogen storage at room temperature with heterogeneous nanostructure

 

Authors:  Kaveh Edalati, Junko Matsuda, Hideaki Iwaoka, Shoichi Toh, Etsuo Akiba, Zenji Horita

 

Article first published online: 7 MAR 2013

 

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