Directly cast fibrous heterostructured FeNi0.9Cr0.5Al0.4 high entropy alloy with low-cost and remarkable tensile properties. (June 2023)

• Record Type: Journal Article
• Authors: Jiang, Zhenfei; Chen, Weiping; Chu, Chenliang; Fu, Zhiqiang; Ivanisenko, Julia; Wang, Hao; Peng, Siyuan; Lu, Yemao; Lavernia, Enrique J.; Hahn, Horst
• Is Part Of: Scripta materialia. Number 230(2023)
• Publication Date: 2023-06
• Subjects: Cast -- High entropy alloy -- Fiber -- Heterogeneous -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2023.115421
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: As-cast alloys generally require additional processing steps before optimal strength-ductility combinations can be achieved, thereby impeding the progress of manufacturing high-performance metallic products by direct casting. Here we report a novel low-cost FeNi0.9 Cr0.5 Al0.4 high entropy alloy with unique fibrous heterogeneous solidification microstructure, i.e., fibers-like face-centered-cubic soft phases that are enveloped in nano-sized ordered body-centered-cubic hard shells. This fibrous microstructure is thought to be responsible for the notable mechanical properties, which includes a yield strength of ∼670 MPa and an ultimate tensile strength of ∼1196 MPa, together with a uniform elongation of ∼21.1% at room temperature. Experimental results confirm the suggestion that the combination of a high strength and good ductility can be attributed to the hetero-deformation induced hardening mechanism generated from the soft-fiber and hard-shell interface. The cost-effectiveness of this as-cast FeNi0.9 Cr0.5 Al0.4 alloy with its unique fibrous structure and outstanding tensile properties renders it an ideal candidate for structural applications. Graphical Abstract: Image, graphical abstract