Engineering transformation pathways in an Al0.3CoFeNi complex concentrated alloy leads to excellent strength–ductility combination

Materials Research Letters

S. Gorsse¹  R. Banerjee²  S. Dasari²  A. Jagetia²  B. Gwalani²  V. Soni² 

[1] CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026;Department of Materials Science and Engineering, University of North Texas;

关键词: high entropy alloys;    complex concentrated alloys;    multicomponent intermetallic precipitation;    multi-phase microstructure;    mechanical properties;   

DOI  :  10.1080/21663831.2020.1777215

来源: DOAJ

【 摘 要 】

Guided by thermodynamic modeling, engineering phase transformation pathways via thermo-mechanical processing, in a complex concentrated alloy/high entropy alloy (HEA) of composition Al0.3CoFeNi, lead to a novel multi-scale microstructure consisting of fine-scale FCC + L12 grains mixed with B2 + BCC grains. The two-step pathway comprises initial decomposition of the parent single-phase FCC to form a fine-grained FCC + B2 microstructure, which further decomposes in the second step into the complex four-phase mixture, exhibiting an excellent combination of tensile yield stress of ∼1490 MPa, ultimate tensile strength of ∼1663 MPa, with a good ductility of ∼12% at room temperature.

【 授权许可】

Unknown