Lamellar-structured low-cost FeMn0.7Ni0.6Cr0.4Al0.3 high entropy alloy with excellent tensile properties

Authors：Jiang, Zhenfei; Chen, Weiping; Chu, Chenliang; Fu, Zhiqiang^*; Lu, Yemao^*; Ivanisenko, Yulia

Source：Vacuum, 2023, 209: 111767.

DOI：10.1016/j.vacuum.2022.111767

• High entropy alloys
• Casting
• Lamellar
• Precipitate
• Mechanical properties

High-performance structural materials with low cost are highly desirable yet challenging. Here we report a novel Co-free FeMn0.7Ni0.6Cr0.4Al0.3 high entropy alloy (HEA) possessing in situ-formed lamellar structure fabricated by a vacuum arc melting method. The alloy is composed of alternating disordered face centered cubic (FCC) lamellae and disordered body centered cubic (BCC) lamellae, with a few ordered BCC (B2) precipitates embedded in the FCC matrix and a high-density B2 precipitates embedded in the BCC matrix. The composite-like lamellar structure renders this as-cast alloy with extraordinary tensile properties with a yield strength of-635 MPa and an ultimate tensile strength of-1061 MPa, together with an elongation of-19.4% at room temper-ature, primarily ascribing to the lamellar boundary strengthening. This as-cast cost-effective FeMn0.7Ni0.6C- r0.4Al0.3 alloy with lamellar structure and outstanding tensile properties is highly suitable for manufacturing high-performance metallic products by direct casting.