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论文类型：期刊论文

发表时间：2016-07-15

发表刊物：SCRIPTA MATERIALIA

收录刊物：SCIE、EI

卷号：120

页面范围：85-89

ISSN号：1359-6462

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

摘要：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.