Transient nucleation in the rapid crystallization of Mg65Zn30Ca5 metallic glass revealed by nanocalorimetry
Source abstract
Abstract
Due to the limited heating ability of conventional calorimetry, nucleation during the rapid crystallization remains ambiguous. In this study, nanocalorimetry was used to ascertain the role of nucleation in the rapid crystallization of Mg 65Zn 30Ca 5 (at.%) metallic glass based on the Johnson-Mehl-Avrami (JMA) model. The rapid quenching rate of nanocalorimetry facilitates the in situ preparation of the amorphous phase, and the number of nuclei preserved in the sample can be tuned. On heating, transient nucleation rather than steady-state nucleation is considered as the dominant mechanism for rapid crystallization. With an increase in quenching rate, more nuclei are produced in the sample, contributing to the enhanced transient nucleation upon reheating. A larger deviation of nucleation rate from the steady-state nucleation is thus caused, which is revealed by a higher Avrami exponent. With the increase in heating rate, transient nucleation is enhanced, and the transition from transient nucleation to steady-state nucleation is postponed.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Material Dynamics and Properties · Phase-change materials and chalcogenides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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