In situ neutron diffraction study of phase stress evolution in a ferrous medium-entropy alloy under low-temperature tensile loading. (May 2019)

• Record Type: Journal Article
• Authors: Bae, Jae Wung; Kim, Jung Gi; Park, Jeong Min; Woo, Wanchuck; Harjo, Stefanus; Kim, Hyoung Seop
• Is Part Of: Scripta materialia. Number 165(2019)
• Page Start: 60
• Page End: 63
• Publication Date: 2019-05
• Subjects: High-entropy alloys -- Medium-entropy alloys -- Phase transformation -- Neutron diffraction -- Low temperature; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.02.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Phase stress evolution of face-centered cubic (FCC) and deformation-induced body-centered cubic (BCC) phases was measured in recently developed ferrous medium-entropy alloy. This was done during tensile deformation at −137 °C using in situ neutron diffraction measurement for the quantitative interpretation of the role of martensitic transformation on the improved low-temperature tensile properties. The strain-hardening rate curve exhibits two-stage hardening behavior, and the phase stress and stress contribution from the BCC phase increases significantly while that from FCC phase decreases during plastic deformation. This is a direct demonstration that BCC phase contributes significantly to the increase in strength and strain hardening. Graphical abstract: Unlabelled Image