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On the short-time thermal phase-stability of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy
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Orientador(es)
Resumo(s)
The present work deals with the short-time thermal phase-stability of the as-cast eutectic AlCoCrFeNi2.1 high entropy alloy. Toward this end, the effect of different temperatures (800-1000 °C) and soaking times (15-60 min) on the stability of primary dendritic regions and formation of the ordered phases was explored. Microstructural characterization was supported by thermodynamic calculations and assessment of the subsequent mechanical properties. Upon the increase in annealing temperature and soaking time, the primary FCC dendritic areas grown and destabilized owing to elemental partitioning. This was followed by dendrite fragmentation and formation of needle shape B2 ordered phases within the primary FCC regions. Despite the unstable nature of the primary constituent phases, the material hardness increased considerably to a peak point corresponding to the moderate soaking time of 45 min. The variation of the subsequent mechanical properties was discussed relying on the characteristics of the ordered and primary phases.
Descrição
The authors would like to gratefully acknowledge the kind support of Clodualdo Aranas, who the NSERC Discovery Grant supported by the Natural Sciences and Engineering Research Council of Canada (RGPIN 04006). JPO acknowledges Fundação para a Ciência e a Tecnologia (FCT – MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI). JPO also acknowledges the funding of CENIMAT/i3N by national funds through the FCT-Fundação para a Ciência e a Tecnologia, I.P., within the scope of Multiannual Financing of R&D Units, reference UIDB/50025/2020–2023. JS acknowledges the China Scholarship Council for funding the Ph.D. grant (CSC No. 201808320394).
Palavras-chave
Aluminum alloys Chromium alloys Cobalt alloys Entropy High-entropy alloys Hypereutectic alloys Iron alloys Phase stability Eutectics As-cast Dendritics Eutectic high entropy alloy High entropy alloys Microstructural characterizations Ordered phasis Soaking time Thermal phase Thermodynamic assessment Thermodynamics