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Medium-range structure and glass forming ability in Zr-Cu-Al bulk metallic glasses

TitleMedium-range structure and glass forming ability in Zr-Cu-Al bulk metallic glasses
Publication TypeJournal Article
Year of Publication2016
AuthorsZhang, P, Maldonis, JJ, Besser, M, Kramer, MJ, Voyles, PM
JournalActa Materialia
Date Published05
Type of ArticleArticle
ISBN Number1359-6454
Accession NumberWOS:000374617600011
Keywordsalloys, atomic packing, carbon potentials, disordered materials, fluctuation electron microscopy, fluctuation microscopy, Glass forming ability, Hybrid reverse Monte Carlo, local-structure, Materials Science, Medium range order, Metallic glass, Metallurgical Engineering, model, monte-carlo method, order, supercooled liquid

Fluctuation electron microscopy experiments combined with hybrid reverse Monte Carlo modeling show a correlation between medium-range structure at the nanometer scale and glass forming ability in two Zr-Cu-Al bulk metallic glass (BMG) alloys. Both Zr50Cu35Al15 and Zr50Cu45Al5 exhibit two nanoscale structure types, one icosahedral and the other more crystal-like. In Zr50Cu35Al15, the poorer glass former, the crystal-like structure is more stable under annealing below the glass transition temperature, T-g, than in Zr50Cu45Al5. Variable resolution fluctuation microscopy of the MRO clusters show that in Zr50Cu35Al15 on sub-T-g annealing, the crystal-like clusters shrink even as they grow more ordered, while icosahedral-like clusters grow. Overall, the results suggest that achieving better glass forming ability in this alloy system may depend more on destabilizing crystal-like structures than enhancing non-crystalline structures. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Structures and Dynamics

Alternate JournalActa Mater.