期刊
ACTA MATERIALIA
卷 121, 期 -, 页码 68-77出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.08.076
关键词
Crystallization; Binary metallic glasses; Thin films; Cu(5)oZr(50); Nanocalorimetry
资金
- National Science Foundation [DMR-1435820, ECS-0335765, DMR-14-20570]
- Shanghai Institutions of Higher Learning (PR China) [TP2014042]
- Materials Research Science and Engineering Center at Harvard University
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1435820, 1436151] Funding Source: National Science Foundation
We have investigated the crystallization kinetics of Cu50Zr50 metallic glass thin films using nanocalorimetry. The crystallization process is growth-controlled during heating and nucleation-controlled during cooling, resulting in different critical heating and cooling rates to suppress crystallization. Measurements over a wide range of scanning rates (13 K/s to 21,000 K/s) reveal that crystallization does not follow Arrhenius kinetics upon heating. Instead, the behavior on heating is well described by a fragility based model of growth-controlled kinetics that takes into account breakdown of the Stokes-Einstein relationship. Upon cooling, the quench rate required to suppress crystallization of the melt is much higher than for bulk samples. This reduced asymmetry in critical heating and cooling rates compared to bulk materials suggests that crystallization of the thin-film metallic glass is controlled by heterogeneous nucleation. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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