Guided by thermodynamic modeling, engineering phase transformation pathways via thermo-mechanical processing, in a complex concentrated alloy (CCA) / high entropy alloy (HEA) of composition Al0.3CoFeNi, leads 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 a tensile yield stress of ~1490 MPa, ultimate tensile strength of ~1663 MPa, with a good ductility of ~12% at room temperature.
Revised: December 3, 2020 |
Published: January 11, 2020
Citation
Dasari S., A. Jagetia, V. Soni, B. Gwalani, S. Gorsse, and R. Banerjee. 2020.Engineering Transformation Pathways in an Al0.3CoFeNi Complex Concentrated Alloy Leads to Excellent Strength-Ductility Combination.Materials Research Letters 8, no. 11:399-407.PNNL-SA-153671.doi:10.1080/21663831.2020.1777215