Bridging the local configurations and crystalline counterparts of bulk metallic glass by nanocalorimetry
Zhao, Bingge (Shanghai University. Institute of Materials)
Yang, Bin (University of Rostock. Institute of Physics and Competence Centre CALOR)
Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física)
Wu, Mannan (Shanghai University. Center for Advanced Solidification Technology)
Schick, Christoph (Kazan Federal University)
Zhai, Qijie (Shanghai University. Center for Advanced Solidification Technology)
Gao, Yulai (Shanghai University. Institute of Materials)

Fecha:	2019
Resumen:	The structural understanding of crystallization in bulk metallic glasses (BMGs) has attracted much attention while rapid crystallization occurring under controllable conditions is less involved. In this study, a CeAlCuCo (at. %) BMG was thermally devitrified by differential scanning calorimetry (DSC) and nanocalorimetry. At a heating rate of 10 K/min by DSC, AlCe and Ce are the major crystalline phases after devitrification while AlCo quasicrystals and Ce are the dominant phases in the crystallization products at a heating rate of 5000 K/s by nanocalorimetry. Attributing to the covalent-like bond in Al-Co atom pairs, AlCo quasicrystals precipitate in the primary crystallization and work as the precursors associating local atomic configurations in the glassy state with crystalline phases after crystallization. Attributing to the enhanced mobility of Cu atoms, compositional redistribution occurs in the as-cast sample. On nanocalorimetry heating, an unambiguous discrepancy in the nucleation and growth of the nano-sized AlCo quasicrystals is thus triggered, contributing to an obvious difference in the crystal size. This research unveils the distinct crystallization behaviors of Ce-based BMG on rapid heating. The formation of quasicrystals demonstrates the multi-stage crystallization on rapid heating and bridges the structural gap between local atomic configurations of metallic glasses and crystalline phases.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Nanocalorimetry ; Nucleation Crystal growth ; Metallic glass ; Quasicrystal
Publicado en:	Journal of Materials Research and Technology, Vol. 8, Issue 4 (July 2019) , p. 3603-3611, ISSN 2238-7854

DOI: 10.1016/j.jmrt.2019.05.023

9 p, 4.3 MB

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