Fatigue behavior of ultrafine grained triplex Al0.3CoCrFeNi high entropy alloy. (1st January 2019)

• Record Type: Journal Article
• Authors: Liu, Kaimiao; Komarasamy, Mageshwari; Gwalani, Bharat; Shukla, Shivakant; Mishra, Rajiv S.
• Is Part Of: Scripta materialia. Number 158(2019)
• Page Start: 116
• Page End: 120
• Publication Date: 2019-01-01
• Subjects: High entropy alloy -- Ultrafine grained -- Tensile -- Fatigue -- Deformation twins; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.08.048
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Ultrafine grained (UFG) alloys suffer from limited strain hardening hence reduced ductility. Incorporation of deformation twinning can overcome this limitation. An Al0.3 CoCrFeNi high-entropy alloy was thermo-mechanically processed to yield a UFG triplex microstructure (davg : 0.71 ± 0.35 μm) with FCC, and hard B2 and sigma phases. The annealed material exhibited an exceptional strength-ductility combination with ultimate tensile strength (UTS) of ~1.1 GPa and elongation of ~25%. Furthermore, the alloy showed excellent fatigue resistance with an endurance limit of ~0.43 UTS. Remarkable mechanical properties are attributed to the formation of extensive deformation nanotwins and increased dislocation accumulation capability. Graphical abstract: Unlabelled Image