On the room-temperature tensile deformation behavior of a cast dual-phase high-entropy alloy CrFeCoNiAl0.7. (10th October 2021)

• Record Type: Journal Article
• Authors: Wang, Qiang; Zeng, Liangcai; Gao, Tengfei; Du, Hui; Liu, Xinwang
• Is Part Of: Journal of materials science & technology. Volume 87(2021)
• Page Start: 29
• Page End: 38
• Publication Date: 2021-10-10
• Subjects: High-entropy alloy -- Microstructure -- Deformation mechanism -- Dislocation -- Stacking fault; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.01.053
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Highlights: The HEA consisted of 77.3 vol.% FCC plus 22.7 vol.% B2. The HEA exhibited excellent tensile properties. Disordered dislocations were to form dislocations wall. Dissociation of dislocations generated stacking fault. Abstract: The microstructure and room-temperature tensile deformation behavior of the cast CrFeCoNiAl0.7 high-entropy alloy (HEA) were studied in details. The cast HEA consisted of a dual-phase structure of 77. 3 vol. % face-centered-cubic (FCC) phase plus 22.7 vol.% B2 phase, and exhibited excellent room-temperature tensile properties with a high yield strength of 876 MPa, ultimate tensile strength of 1198 MPa and a relatively large elongation to fracture of ∼9 %. Dislocations gliding in the FCC phase governed the plastic deformation at the early stage of room-temperature tensile, and disordered dislocations were to form dislocation walls as the deformation proceeded. With further increase in strain to a high level, the stacking faults were generated through the dissociation of the geometrically necessary dislocations, serving as the potential heterogeneous nucleation sites for the deformation twins.