In-situ TEM study of the crystallization sequence in a gold-based metallic glass

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dc.contributor.authorIvanov, Yu P.
dc.contributor.authorMeylan, Carolina M.
dc.contributor.authorPanagiotopoulos, Nikolaos T.
dc.contributor.authorGeorgarakis, Konstantinos
dc.contributor.authorGreer, Lindsay A.
dc.date.accessioned2020-07-13T14:01:57Z
dc.date.available2020-07-13T14:01:57Z
dc.date.freetoread2020-07-13
dc.date.issued2020-06-18
dc.description.abstractThe composition Au49Ag5.5Pd2.3Cu26.9Si16.3 (at.%) is of interest as the basis for the development of gold-based bulk metallic glasses for application in jewellery. In-situ heating in transmission electron microscopy (TEM) and differential scanning calorimetry (DSC, both conventional and fast) are used to obtain a comprehensive characterization of the decomposition on heating a melt-spun glass of this composition. Linking TEM with DSC over a range of heating rates 0.083ā€’2000 K sā€’1, allows the sample temperature in the TEM heating stage to be calibrated. On heating up to melting, the glass decomposes in up to four stages: (1) complete transformation to single-phase nanocrystalline (Au,Cu)7Si; (2) grain growth of this phase; (3) precipitation of (Pd,Ag)Si, reducing the supersaturation of silicon in the (Au,Cu)7Si matrix; (4) with the precipitate phase remaining stable, decomposition of the matrix to a mixture of (Au,Ag)8Cu2, AuCu and Cu3Au phases. At all stages, grain diameters remain sub-micrometre; some of the stable nanocrystalline microstructures may themselves be of interest for applications. The characterization of the decomposition can assist in the optimization of the glass composition to improve tarnish-resistance, while retaining adequate glass-forming ability, formability in thermoplastic processing, and resistance to crystallization. For materials in general, the close correlation of in-situ TEM and DSC results should find wide use in characterizing complex transformation sequences.en_UK
dc.identifier.citationIvanov YP, Meylan CM, Panagiotopoulos NT, et al., (2020) In-situ TEM study of the crystallization sequence in a gold-based metallic glass. Acta Materialia, Volume 196, September 2020, pp. 52-60en_UK
dc.identifier.cris27467196
dc.identifier.issn1359-6454
dc.identifier.urihttps://doi.org/10.1016/j.actamat.2020.06.021
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15549
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectMetallic glassen_UK
dc.subjectIn-situ transmission electron microscopy (TEM)en_UK
dc.subjectDifferential scanning calorimetry (DSC)en_UK
dc.subjectCrystallizationen_UK
dc.subjectNanocrystalline alloysen_UK
dc.titleIn-situ TEM study of the crystallization sequence in a gold-based metallic glassen_UK
dc.typeArticleen_UK

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