Mechanical alloying was used to produce nanocrystalline TiNi-type alloys. The amorphization of the alloys was studied by X-ray diffraction. The originally sharp diffraction lines of elementary powders gradually became broader and their intensity decreased with the milling time. After 5 h of milling, the initial mixture of the elements was transformed into an amorphous phase. The annealing in high-purity argon at 750 deg C for 0.5 h resulted in formation of the CsCl-type structure. After the mechanical alloying, the DSC curve exhibited one exothermic effect at 450 deg C. According to SEM studies, many small powder particles had a tendency to agglomerate during the mechanical alloying. The cleavage fracture morphology and inhomogeneous size distribution were shown. The average crystalline size of the nanocrystalline TiNi powders was of the order of 30 nm. Mechanical alloying was found a suitable procedure to obtain Ti-based electrode alloy powders. The respective replacement of Ni in TiNi by Zr improved the hydrogen capacity and the cycle life of electrodes. Nanocrystalline TiNi(0.875)Zr(0.125) alloy had the highest capacity (134 mA/g) observed at the 15th cycle.
Wplyw Zr na wlasciwosci nanokrystalicznych stopow typu TiNi odwracalnie absorbujacych wodor
Effect of Zr addition on the properties of nanocrystalline TiNi-type reversible hydrogen-storage alloys
Inzynieria materialowa ; 26 , 2 ; 50-54
2005
5 Seiten, 5 Bilder, 1 Tabelle, 15 Quellen
Aufsatz (Zeitschrift)
Polnisch
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