Issues »  Volume 48, Issue 8

Influence of LaHx Additions on Characteristics of TiFe-Based Hydrogen-Storage Alloys Manufactured via Hydrogen-Assisted Powder Metallurgy

Z. Liu$^{1,2}$, Y. Wang$^{1,2}$, T. Cheng$^{1,2}$, Y. Song$^{1,2}$, D. Savvakin$^{1,2,3}$, N. Li$^{4}$, O. Ivasishin$^{1,2,3}$

$^{1}$College of Materials Science and Engineering, Jilin University, CN-130012 Changchun, China
$^{2}$International Center of Future Science, Jilin University, CN-130012 Changchun, China
$^{3}$G. V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{4}$State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, CN-430074 Wuhan, China

Received: 08.07.2026; final version - 16.07.2026. Download: PDF

TiFe-based alloys are promising candidates for solid-state hydrogen storage due to their low cost and excellent reversibility near room temperature. However, the conventional powder metallurgy (PM) manufacturing method often induces severe surface oxidation of Ti powders, which significantly hinders the activation and degrades the hydrogen-storage capacity of produced TiFe alloys. In this work, low-cost TiFe-based alloys are synthesized via hydrogen-assisted powder-metallurgy route. To mitigate the oxygen impurity issue, La hydride (LaHx) is introduced as an oxygen scavenger and pore-forming agent. The results indicate that the addition of La plays a dual role: it reacts with oxygen to form stable La oxides, thereby reducing the oxygen content within the main TiFe matrix, and creates a porous microstructure that facilitates hydrogen redistribution inside the material. Characterization by O/N/H analysis and XRD confirms that, while the total oxygen content increases with La doping, the formation of La-oxide precipitations reduces the concentration of oxygen dissolved in the TiFe matrix. Consequently, the La-doped alloy exhibits superior activation properties and a reversible hydrogen-storage capacity of 0.96% wt. at 40oC compared to 0.58% wt. for the undoped alloy. This study provides a feasible strategy for preparing high-performance TiFe-based alloys via a cost-effective PM route.

Key words: TiFe alloy, La hydride, hydrogen-assisted powder metallurgy, pore-forming effect, hydrogen-storage capacity.

URL: https://mfint.imp.kiev.ua/en/abstract/v48/i08/0775.html

DOI: https://doi.org/10.15407/mfint.48.08.0775

PACS: 61.43.Gt, 61.72.sh, 64.75.Lm, 81.05.Rm, 81.20.Ev, 88.30.R-

Citation: Z. Liu, Y. Wang, T. Cheng, Y. Song, D. Savvakin, N. Li, and O. Ivasishin, Influence of LaHx Additions on Characteristics of TiFe-Based Hydrogen-Storage Alloys Manufactured via Hydrogen-Assisted Powder Metallurgy, Metallofiz. Noveishie Tekhnol., 48, No. 8: 775–789 (2026)

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