Unexpected cyclic stress-strain response of dual-phase high-entropy alloys induced by partial reversibility of deformation. (15th January 2018)

• Record Type: Journal Article
• Authors: Niendorf, Thomas; Wegener, Thomas; Li, Zhiming; Raabe, Dierk
• Is Part Of: Scripta materialia. Number 143(2018)
• Page Start: 63
• Page End: 67
• Publication Date: 2018-01-15
• Subjects: High-entropy alloy -- Fatigue -- Dual phase -- Planar slip -- Martensite; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.09.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The recently developed dual-phase high-entropy alloys are characterized by pronounced strain hardening and high ductility under monotonic loading owing to the associated transformation induced plasticity effect. Fatigue properties of high-entropy alloys have not been studied in depth so far. The current study focuses on the low-cycle fatigue regime. Cyclic tests were conducted and the microstructure evolution was studied post-mortem. Despite deformation-induced martensitic transformation during cycling at given plastic strain amplitudes, intense strain hardening in the cyclic stress-strain response is not observed. This behavior is attributed to the planar nature of slip and partial reversibility of deformation. Graphical abstract: Image 1