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dc.contributor.author장혜정-
dc.contributor.author김진연-
dc.contributor.author오현석-
dc.contributor.author김진우-
dc.contributor.author류채우-
dc.contributor.author이근우-
dc.contributor.author박은수-
dc.date.accessioned2021-06-09T04:20:27Z-
dc.date.available2021-06-09T04:20:27Z-
dc.date.issued2018-08-
dc.identifier.citationVOL 155-361-
dc.identifier.issn1359-6454-
dc.identifier.other51133-
dc.identifier.urihttp://pubs.kist.re.kr/handle/201004/67905-
dc.description.abstractIn the present study, we carefully evaluate the role of high entropy alloy (HEA) characteristics on glass-forming ability (GFA) and mechanical responses in a newly developed Er-Gd-Y-Al-Co high entropy bulk metallic glass (HE-BMG) by comparison with the Er-Al-Co and Er-Y-Al-Co bulk metallic glasses (BMGs). The addition of multiple rare-earth elements (REs) to Er-Al-Co BMG results in both higher fragility according to Adam-Gibbs theory and slower crystallization kinetics according to confusion principle. Based on these mutual competitions, the Er18Gd18Y20Al24Co20 HE-BMG can be successfully fabricated up to 5&#8239-
dc.description.abstractmm in diameter for glass formation. In particular, the HE-BMG exhibits unexpected structural bias and more fragile manner via preferential covalent bonding of Co-Al and various RE-Al clusters, which leads to larger deviation from the typical BMGs' behavior in the relation between fragility and elastic properties. Furthermore, the HE-BMG effectively retards crystallization kinetics, which was confirmed by exceptionally sluggish nanocrystallization of multi-precipitates from metastable liquid and longer post-recalescence plateau duration in cooling curve of solidification from stable liquid. Indeed, the increased structural instability due to HEA characteristics (preferential short-range order and sluggish crystallization) in HE-BMGs reduces cut-off size of self-organized shear avalanches and increases the number of chaotic shear avalanches, which can distribute the applied strain more homogeneously, resulting in enhanced intrinsic ductility. Consequently, these results provide a guideline on how to design HE-BMGs with promising properties by utilizing HEA characteristics, and thus can give us a strategy for bridging BMG and HEA.-
dc.publisherActa materialia-
dc.titleUtilization of high entropy alloy characteristics in Er-Gd-Y-Al-Co high entropy bulk metallic glass-
dc.typeArticle-
dc.relation.page350361-
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