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Microstructure and mechanical properties of a high entropy alloy with a eutectic composition (AlCoCrFeNi2.1) synthesized by mechanical alloying and spark plasma sintering
journal contribution
posted on 2020-09-15, 00:00 authored by Rahul John, A Karati, Jithin JosephJithin Joseph, Daniel FabijanicDaniel Fabijanic, B S MurtyEutectic high entropy alloys synthesized via conventional casting have been intensely studied recently owing to their superior mechanical properties. In the current work, AlCoCrFeNi2.1 eutectic high entropy alloy has been synthesized for the first time via a combination of mechanical alloying and spark plasma sintering (MA-SPS) route. The alloy primarily showed FCC and B2 phases in addition to minor secondary phases. As opposed to previous literature on MA-SPS, WC contamination from milling media was eliminated by adopting a shorter milling time. Apart from the elimination of WC, the adopted strategy is an effective method to obtain a heterogeneous microstructure, which has been demonstrated to enhance both strength and compressive strain to failure. Heat treatment of the alloys for a short duration of 10 min at 1200 °C was found to improve both strength and compressive plasticity. This was attributed to the reprecipitation of secondary phases and the presence of heterogeneous microstructure.
History
Journal
Journal of Alloys and CompoundsVolume
835Article number
155424Pagination
1 - 10Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0925-8388Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2020, Elsevier B.V.Usage metrics
Keywords
High entropy alloysMechanical alloyingBimodal microstructureCompressive strengthHeat treatmentScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringChemistryMaterials ScienceNANOCRYSTALLINE COCRFENISTRENGTHENING MECHANISMSPHASE EVOLUTIONBEHAVIORFCCSTABILITYDUCTILITYNICKELCondensed Matter Physics
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