Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-07-15

Journal: SCRIPTA MATERIALIA

Included Journals: EI、SCIE

Volume: 120

Page Number: 85-89

ISSN: 1359-6462

Key Words: Multi-principal-element alloy; Alloy design; Cluster-plus-glue-atom model; Coherent precipitation; Mechanical properties

Abstract: The present work reports a cuboidal B2-coherently-enhanced body-centered-cubic (BCC) alloy Al0.7CoCrFe2Ni with prominent tensile properties at both room (ultimate tensile strength sigma(b) = 1223 MPa and elongation to fracture delta = 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 = Co1/2Cr1/5Fe2/5Ni1/5, 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. (C) 2016 Elsevier Ltd. All rights reserved.