Lamellar-structured low-cost FeMn0.7Ni0.6Cr0.4Al0.3 high entropy alloy with excellent tensile properties. (March 2023)

• Record Type: Journal Article
• Authors: Jiang, Zhenfei; Chen, Weiping; Chu, Chenliang; Fu, Zhiqiang; Lu, Yemao; Ivanisenko, Yulia
• Is Part Of: Vacuum. Volume 209(2023)
• Publication Date: 2023-03
• Subjects: High entropy alloys -- Casting -- Lamellar -- Precipitate -- Mechanical properties; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2022.111767
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: High-performance structural materials with low cost are highly desirable yet challenging. Here we report a novel Co-free FeMn0.7 Ni0.6 Cr0.4 Al0.3 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 temperature, primarily ascribing to the lamellar boundary strengthening. This as-cast cost-effective FeMn0.7 Ni0.6 Cr0.4 Al0.3 alloy with lamellar structure and outstanding tensile properties is highly suitable for manufacturing high-performance metallic products by direct casting. Highlights: Vacuum arc melted FeMn0.7 Ni0.6 Cr0.4 Al0.3 alloy is composed of alternating disordered BCC and FCC lamellae. This composite-like alloy achieved superior tensile properties and low-cost, offering great potential for applications. The outstanding tensile properties is primarily attributed to lamellar boundary hardening and precipitates hardening.