H2 absorption in amorphous and nanostructured Zr-based alloys under milling

Hydriding kinetics and process parameters in reactive milling

“…Such behaviour suggests that the same hydriding mechanism is operative, independently by the applied I M , as it is also confirmed by the same structural evolution which followed the absorption: in all the tests the separation of crystalline ZrH 1.66 accompanied the formation of the amorphous hydride, see the highest trace in Fig. 1 and the reference [10].…”

“…Different characteristic behaviours emerged, which were exemplified by two well known hydrogen storage systems [9,10], Mg 2 Ni/Ni composites and Zr-based quaternary alloys. While nanostructured Mg 2 Ni/Ni alloy was able to absorb H 2…”

In situ pressure and temperature monitoring during the conversion of Mg into MgH2 by high-pressure reactive ball milling

“…An incubation time for the hydrogenation reaction of Zr based alloys by reactive ball milling was reported previously in Ref. [13]. Milling under a lower pressure (10 bar) leads to a clearly different behaviour.…”

Conditions for quasicrystal formation from mechanically alloyed Zr-based glassy powders

“…Differently, the XRD pattern of Alloy II heated up to 733 K, corresponding to the completion of the first exothermic DSC peak, displays the presence of some modulations on the main amorphous maximum that indicates the formation of an ordered phase of nanoscale dimensions. This unidentified phase might be an extremely small and distorted Ti 2 Ni-type big cube phase, which has been reported to form during milling [23] as well as during crystallization of Zr-based glassy powders produced by mechanical alloying [24]. The crystallization of glasses/supercooled liquids proceeds by a nucleation and growth mechanism [25].…”