Abstract
Mg 0.5Ni 0.3La 0.2 metallic glass is known as having a wide range in which it is in a supercooled liquid state. Changes in structural and thermal properties of Mg 0.5Ni 0.3La 0.2 at the supercooled liquid state (167°C) were studied by small angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). DSC results show that the amorphous state is stabilized after annealing at 167°C for the period of time before the onset of crystallization. SAXS results suggest that concentration segregation evolves with a relatively large size and low concentration fluctuations after annealing at 167°C for 40 h before onset of crystallization. The interface of the segregated area is diffuse even after the crystallization starts. The crystallization from a supercooled liquid proceeds in spinodal decomposition mode rather than nucleation and growth mode.
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