期刊
INTERMETALLICS
卷 43, 期 -, 页码 53-59出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2013.06.010
关键词
Glasses; metallic; Laser processing; Phase transformation
资金
- Office of Naval Research [N0014-08-1-1023]
Laser deposition of a Zr-Cu-Ni-Al-Nb metallic glass has been studied in an effort to understand and evaluate the challenges of fabricating metallic glass components via additive manufacturing techniques. The parent amorphous alloy crystallizes into micro-scale spherulites at heating rates up to 10(4) K/s during laser processing. Detailed microstructural and compositional examinations of the spherulites reveals that rapid heating suppresses phase separation and nucleation at the initial stage of crystallization, resulting in a growth-dominated crystallization behavior. The activation energy of spherulitic crystallization is estimated to be 124 kJ/mol, significantly lower than that of multiphase nanocrystallization reported elsewhere. The low activation energy of spherulitic crystallization is consistent with observations of the short-range redistribution of constituent elements at the amorphous-crystalline interfaces during growth of the spherulites. (c) 2013 Elsevier Ltd. All rights reserved.
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