State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
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DOI:
10.7502/j.issn.1674-3962.2014.05.05
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Abstract:
Abstract: Metallic glasses, as a new class of metallic materials with potential applications in structural and functional aspects, are one of the hottest topics in the field of physics and materials science. Since they are metastable thermodynamically, metallic glasses always transform into their crystalline counterparts spontaneously under some suitable conditions, leading to the occurrence of crystallization event. The research on nanocrystallization of metallic glasses not only is of scientific importance, but also offers theoretical guidance for applications of these materials. In this paper, we give a brief review of several representative micromechanisms for nanocrystallization of metallic glasses, including classical nucleation theory, nucleation mechanism based on the linked-flux model, nucleation and growth mechanism associated with phase separation, cluster deposition micromechanism, non-classical nucleation theory, and nanocrystallization micromechanism under a larger undercooling. Moreover, our recent progress in understanding the atomistic mechanism for nanocrystallization of metallic glasses is also reviewed. Finally, we point out a couple of issues that deserve further investigation to fully understand nanocrystallization behaviors of metallic glasses.Keywords: Metallic glass; Amorphous alloy; Nanocrystallization; Micromechanism