Orientation Relationships in Al0.7CoCrFeNi High-Entropy Alloy

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    Abstract

    A detailed microstructural evaluation was executed on the crystallographic texture as well as the mechanisms for nucleation, phase transformation, and grain growth in a Al0.7CoCrFeNi high-entropy alloy. The microstructure and crystallographic orientations were characterized by electron backscatter diffraction, and the chemical composition variations by energy-dispersive X-ray spectroscopy. The cast Al0.7CoCrFeNi alloy started in the BCC phase and partially transformed into the FCC phase. It was found that the Pitsch orientation relationship (OR) dominates the nucleation mechanism of the FCC phase; however, deviations with respect to the Pitsch OR are observed and are attributed to the differently sized atoms forming an ordered B2 phase in the alloy causing lattice distortions. The dual phase BCC-FCC microstructure contains FCC Widmanstatten plates oriented parallel to the {110}(BCC) planes of the parent grain. It was found that the crystal orientation distribution after the BCC-FCC phase transformation is confined and is explained as a product of the governing mechanisms.

    Original languageEnglish
    Pages (from-to)905-915
    Number of pages11
    JournalMicroscopy and Microanalysis
    Volume23
    Issue number5
    Early online date15-Aug-2017
    DOIs
    Publication statusPublished - Oct-2017

    Keywords

    • electron backscatter diffraction
    • orientation relationships
    • high entropy alloy
    • nucleation
    • phase transformation

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