Fast synthesis of TiNi by mechanical alloying and its hydrogenation properties. (23rd April 2019)

• Record Type: Journal Article
• Authors: Nobuki, Tohru; Crivello, Jean-Claude; Cuevas, Fermin; Joubert, Jean-Marc
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 21(2019)
• Page Start: 10770
• Page End: 10776
• Publication Date: 2019-04-23
• Subjects: Mechanical alloying -- TiNi -- Hydrogen storage; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.02.203
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Mechanical alloying is widely used for the synthesis of hydrogen storage materials. However, amorphization and contamination triggered by long-time milling are serious drawbacks for obtaining efficient hydrogen storage. In this work, short-time ball milling synthesis is explored for a representative hydride forming compound: TiNi. Through structural, morphological and chemical characterizations, we evidence that formation of TiNi is complete in only 20 min with minor Fe contamination (0.2 wt%). Cross-sectional analysis of powder stuck on milling balls reveals that alloy formation occurs through the interdiffusion between thin layers of co-laminated pure elements. Hydrogenation thermodynamics and kinetics of short-time mechanically alloyed TiNi are similar to those of coarse-grained compounds obtained by classical high-temperature melting. Mechanical alloying is a suitable method for fast and energy-efficient synthesis of intermetallic compounds such as TiNi. Highlights: TiNi phase synthesized in only 20 min of mechanical alloying. TiNi formation mechanism visualized by scanning electron microscopy. Mechanically alloyed TiNi has a high hydrogen capacity and fast absorption kinetics. Mechanical alloying is an energy-efficient method for TiNi synthesis.