Crystallographic orientation-dependent deformation characteristics of additive manufactured interstitial-strengthened high entropy alloys. (1st January 2023)

• Record Type: Journal Article
• Authors: Zhang, Wei; Shen, Jiajia; Oliveira, J.P.; Kooi, Bart J.; Pei, Yutao
• Is Part Of: Scripta materialia. Number 222(2023)
• Publication Date: 2023-01-01
• Subjects: Laser powder-bed fusion -- High entropy alloy -- Synchrotron X-ray diffraction -- Crystallographic orientation -- Micropillars; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115049
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this study, laser powder bed fusion (LPBF) was used for the fabrication of an interstitial-strengthened high entropy alloy (iHEA), Fe49.5 Mn30 Co10 Cr10 C0.5 (at.%). The as-fabricated iHEA possesses excellent strength-ductility synergy during tensile loading, with fracture strength reaching up to 1109 MPa at 37% engineering strain. Electron backscatter diffraction (EBSD) and high energy synchrotron X-ray diffraction were used to evaluate the microstructural characteristics of the material. In-situ EBSD analysis during uniaxial tensile testing was performed to unveil the deformation mechanisms. Moreover, crystallographic orientation-specific micropillar compression tests were conducted to determine how the grain deformation characteristics differ between orientations. Due to the activation of multiple slip systems and the homogeneous plastic flow, the [111] orientation demonstrated a higher yield strength and continuous work hardening rate. This research helps in clarifying grain orientation-specific contributions to the bulk mechanical response of additively manufactured HEA. Graphical abstract: Image, graphical abstract