In-situ neutron diffraction studies on high-temperature deformation behavior in a CoCrFeMnNi high entropy alloy. (July 2015)

• Record Type: Journal Article
• Authors: Woo, Wanchuck; Huang, E-Wen; Yeh, Jien-Wei; Choo, Hahn; Lee, Chi; Tu, Shan-Yi
• Is Part Of: Intermetallics. Volume 62(2015:Jul.)
• Page Start: 1
• Page End: 6
• Publication Date: 2015-07
• Subjects: A. High–entropy alloys -- B. Creep -- D. Microstructure -- E. Multiscale -- F. Diffraction/scattering; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2015.02.020
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: An equiatomic, face-centered-cubic, CoCrFeMnNi high-entropy alloy was tensile tested at 800 K and 1, 000 K with a nominal strain rate of 6.7 × 10 −6 s −1 . In addition to the macroscopic (bulk) behavior, mesoscopic (lattice) phenomena during the pseudo-creep deformation were investigated simultaneously using in-situ neutron diffraction. The evolutions of lattice strains, peak widths, and intensities of several hkl reflections suggest that the dominant deformation mode is the dislocation glide at 800 K and diffusion-controlled dislocation creep at 1, 000 K. Highlights: We investigated an equiatomic, face-centered-cubic, CoCrFeMnNi high entropy alloy. We applied in-situ neutron diffraction measurements. The lattice-strain, diffraction peak-width, and intensity evolutions are studied. Creep is activated at 1, 000 K and the associated diffraction patterns are reported. TEM results support the factual and descriptive characters of neutron patterns.