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Abstract

The main obstacle for a supercooled liquid to form a glass is nucleation and growth of thermodynamically favored crystalline phases which can be hindered kinetically by rapid quenching. Metallic liquids are typically poor glass formers which means that they require significant cooling rates to bypass formation of crystal nuclei and, if nuclei were formed, to suppress their growth. Due to their extremely short time scales, not accessible to conventional experimental methods, microscopic mechanisms of transformations between liquid and crystalline states in metals remain rather poorly understood. The objective of the current project is to overcome this time-scale limitation by employing pulsed laser heating to probe an ultrafast melting and crystallization of thin film metallic layers.

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