Microstructure and mechanical properties of Al-Fe-Co-Cr-Ni high entropy alloy fabricated via powder extrusion

• Published in: Journal of alloys and compounds 2023-05, Vol.943, p.169052, Article 169052
• Main Authors: Fu, Ao, Cao, Yuankui, Xie, Zhonghao, Wang, Jian, Liu, Bin
• Format: Article
• Language: English
• Subjects: Extrusion; High entropy alloy; Mechanical property; Microstructure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.169052

A novel non-equiatomic Al15.85Fe11.15Co32.11Cr10.76Ni30.13 high entropy alloy (HEA) was fabricated via powder metallurgy (P/M) method. The Al15.85Fe11.15Co32.11Cr10.76Ni30.13 HEA exhibits dual-phase microstructure consisting of face-centered-cubic (FCC) and body-center cubic (BCC) phases. The Al15.85Fe11.15Co32.11Cr10.76Ni30.13 HEA has high compressive yield strength of 938 MPa and fracture strength of 3360 MPa, and still maintains moderate fracture strain higher than 40%. Also, the Al15.85Fe11.15Co32.11Cr10.76Ni30.13 HEA has high strength of 518 MPa at the temperature of 600 °C. Microstructural characterization shows that a large number of L12 and B2 nanoprecipitates are uniformly dispersed in the FCC and BCC phases, respectively, contributing to the enhancement of the strength of the two phases. The effective combination of FCC and BCC phases eventually leads to the high strength of the Al15.85Fe11.15Co32.11Cr10.76Ni30.13 HEA. This finding provides novel guidance for the development of high-performance structural materials with superior balance of strength and ductility for future industrial applications. •Novel Al15.85Fe11.15Co32.11Cr10.76Ni30.13 HEA was prepared through powder metallurgy method.•The HEA exhibits dual-phase (FCC + BCC) microstructure.•Massive L12 and B2 nanoprecipitates are embedded in the FCC and BCC phases, respectively.•The HEA exhibits high compressive yield strength of 938 MPa at room temperature.•The high strength is attributed to the hierarchically heterogeneous microstructure.