Dresden 2020 – wissenschaftliches Programm
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MM 8.5: Vortrag
Montag, 16. März 2020, 12:45–13:00, IFW B
Phase selection and microstructural evolution of CoCrNi medium entropy alloy under cointernerless processing — •Angelo Fernandes Andreoli1, Olga Shuleshova1, Yuhao Wu1, 2, and Ivan Kaban1 — 1IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden, Germany — 2Department of Applied Physics, Northwestern Polytechnical University, Xi'an, 710072, China
The CoCrNi alloy was cointainerlessly processed using a portable electromagnetic levitation device where in-situ X-ray diffraction and a high-speed camera were used to monitor the phase evolution and solidification behavior. At low undercoolings, the alloy nucleates the stable γ-fcc phase, which consequently grows until the solidification is over. Beyond a critical undercooling, it first nucleates the metastable δ-bcc phase, which completely transforms into the stable γ-fcc phase as solidification evolves. Crystal growth kinetics were determined and are comparable to Fe-Co binary alloys. The microstructural evolution exhibits a transition from a dendritic microstructure at low undercoolings to an equiaxed-refined structure at deeper undercoolings.