Microstructure and Mechanical Properties of Equitomic CoCrFeCuNi High Entropy Alloy

Seung Min Oh; Sun Ig Hong

doi:10.4028/www.scientific.net/KEM.765.149

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 765Microstructure and Mechanical Properties of...

Microstructure and Mechanical Properties of Equitomic CoCrFeCuNi High Entropy Alloy

Abstract:

Microstructure and mechanical properties of cast and cold-rolled equitomic CoCrFeCuNi alloy in which Mn was substituted by Cu from Cantor alloy was studied. The separation into two solid solutions (Cr-Co-Fe rich and Cu-rich phases) were observed in CoCrFeCuNi. Coarsening and widening of interdendritic Cu-rich phase after homogenization was observed after homogenization, suggesting Cu-rich phase is thermodynamically stable. The compressive stress-strain curves of homogenized cast CoCrFeCuNi alloy exhibited the reasonably high strength and excellent deformability for the cast alloy. The yield strength increased up to 960MPa after cold rolling from 265MPa of the homogenized cast alloy. The significant increase of yield strength is thought to be associated with the alignment of Cu-rich second phase in addition to cold work dislocation storage after cold rolling.

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Periodical:

Key Engineering Materials (Volume 765)

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149-154

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https://doi.org/10.4028/www.scientific.net/KEM.765.149

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Online since:

March 2018

Authors:

Seung Min Oh, Sun Ig Hong*

Keywords:

CoCrFeCuNi, High Entropy Alloy, Mechanical Properties, Microstructure

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