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Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

TitleKinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50
Publication TypeJournal Article
Year of Publication2015
AuthorsCullinan, T, Kalay, I, Kalay, YE, Kramer, M, Napolitano, R
JournalMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
Date Published02
Type of ArticleArticle
ISBN Number1073-5623
Accession NumberWOS:000347303400007
Keywordsalloy system, at.percent, behavior, copper-zirconium, crystallization, Cu-Zr, cu70zr30, intermetallic phase, metallic glasses, thermal-stability

and growth of competing stable and metastable phases. The isothermal devitrification response was found to involve the Cu10Zr7, CuZr2, and CuZr phases, consistent with previously reported constant heating rate experiments, but here we have resolved the phase evolution and structural characteristics of the transformation, including the very early stages of crystallization. At 671 K (398 A degrees C), the isothermal transformation starts with the formation of the Cu10Zr7 phase, which grows in a generally equiaxed morphology. At a size of approximately 100 nm, the growth of the Cu10Zr7 particles is interrupted by the precipitation of a thin layer of the CuZr2 phase, upon which the metastable CuZr (B2) grows epitaxially. Crystallization kinetics are quantified here though in situ measurements (HEXRD, DSC) and ex situ microstructural analysis (TEM, HRTEM). Finally, the influences of chemical partitioning, diffusion, and crystallographic orientation on this sequence are examined.

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Structures and Dynamics