Browsing by Author "Choo, Hahn"

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In-situ neutron diffraction studies on high-temperature deformation behavior in a CoCrFeMnNi high entropy alloy
(2015-07-01)
Woo, Wanchuck
;
Huang, E-Wen
;
Yeh, Jien-Wei
;
Choo, Hahn
;
Lee, Chi
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 x 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. (C) 2015 Elsevier Ltd. All rights reserved.