A cuboidal B2 nanoprecipitation-enhanced body-centered-cubic alloy Al 0.7 CoCrFe 2 Ni with prominent tensile properties

Abstract The present work reports a cuboidal B2-coherently-enhanced body-centered-cubic (BCC) alloy Al 0.7 CoCrFe 2 Ni with prominent tensile properties at both room (ultimate tensile strength σ b  = 1223 MPa and elongation to fracture δ = 7.9%) and high temperatures. This multi-principal-element alloy is developed out of a cluster formula [Al–M 14 ]Al 1 issued from the cluster-plus-glue-atom model of a BCC structure. Here, the [Al–M 14 ] cluster is centered by Al, surrounded by fourteen average atoms M = Co 1/5 Cr 1/5 Fe 2/5 Ni 1/5 , and glued with one Al atom. Its excellent mechanical properties are attributed to a superalloy-like microstructure, characterized by cuboidal B2 nanoprecipitates coherently embedded in the BCC matrix.

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