<I>In-situ</I> Observation of C14 Type Laves Phase Nucleation from Mechanically Milled Amorphous Zr–Ni–V–Mn–Fe Alloy

TL;DRAbstract

Nanoscale polycrystalline powders which consist mainly of the C14 type Laves phase were obtained from the amorphous phase produced by mechanically alloyed (MA) metallic powders (pure Zr, pure Ni, and atomized Ni–V–Mn–Fe alloy) after annealing under vacuum atmosphere. The average diameter of nanoscale grains was of the order of 10 nm. Nucleation of the C14 type Laves phase from the amorphous phase was confirmed by the exothermic reaction in a differential scanning calorimeter (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Onset of the exothermic reaction was observed at 473 and 889 K, respectively. In-situ observation of TEM with a heating stage determined the nucleation of the C14 type Laves phase at 473 K and the secondary recrystallization at 889 K with lattice images.

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