Dynamic precipitation at elevated temperatures in a dual-phase AlCoCrFeNi high-entropy alloy: an in situ study. (2nd September 2018)

• Record Type: Journal Article
• Authors: Ghassemali, Ehsan; Sonkusare, Reshma; Biswas, Krishanu; Gurao, Nilesh P.
• Is Part Of: Philosophical magazine letters. Volume 98:Number 9(2018)
• Page Start: 400
• Page End: 409
• Publication Date: 2018-09-02
• Subjects: AlCoCrFeNi -- EBSD -- fracture -- precipitation -- crack propagation; Condensed matter -- Periodicals; Physics -- Periodicals; Solid state physics -- Periodicals; Physique -- Périodiques; 530.41
• DOI: 10.1080/09500839.2018.1563728
• Languages: English
• ISSNs: 0950-0839

Abstract

ABSTRACT: The effect of a possible phase transformation or precipitation of the face-centred cubic (FCC) phase on intermediate-temperature deformation of a dual-phase AlCoCrFeNi high-entropy alloy has been studied using in situ tensile testing at 550°C. Electron backscatter diffraction (EBSD) results showed localised precipitation of the FCC phase during the intermediate-temperature deformation. The overall fracture behaviour and crack propagation of the material was not altered much compared to the room-temperature behaviour, namely brittle trans-granular fracture. Deformation at higher temperatures (above 750°C) is suggested as a way to enhance the dynamic FCC phase precipitation, in order to improve the ductility or deformability of the alloy.