Microstructures in as-cast condition of Medium Entropy Alloys designed to contain eutectic carbides TaC or HfC
Résumé
Three alloys derived from the Cantor's CoNiFeMnCr equimolar composition, with a decreased Mn content and an increased Cr content, were cast to explore the possible microstructure changes induced by these composition modifications. One was a quinary alloy and the two other alloy result from the addition of either Ta and C, or Hf and C, to the previous one. As recently observed for an equimolar base, these addition of carbon and of the MC-former elements produced the interdendritic precipitation of eutectic script-like monocarbides, known to efficiently strengthen some cobalt-based superalloys at high temperatures. Enhanced creep resistance is thus expected, suggested here first by the increase in ambient temperature hardness, while improved high temperature oxidation resistance should be obtained by comparison to the equimolar CoNiFeMnCr a little too poor in chromium.
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325 JournalofEngineeringSciencesandInnovation2023vol8p319.pdf (1.06 Mo)
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Licence : CC BY - Paternité