Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 12: Poster session I
MM 12.34: Poster
Monday, April 1, 2019, 19:15–20:45, Poster C
atomic mobilities of fcc Co-V-Mo alloys: measurement and modeling — •Jingfeng Zhang1, Yong Du2, Sergiy Divinski1, and Gerhard Wilde1 — 1Institute of Materials Physics, Westfälische-Wilhelms University of Münster, Münster, Germany — 2State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
Co is widely used as a matrix binder phase for cemented carbides. Certain addition of V and Mo in Co can minimize the grain size of cemented carbides, behaving as the grain growth inhibitors. Though diffusion plays a key role in material manufacturing process, there are no investigations of diffusion kinetics of this ternary system so far.
Based on 18 sets of diffusion couples, the composition-dependent interdiffusion coefficients in the fcc Co-rich Co-V-Mo alloys at 1273, 1373 and 1473 K were obtained from the intersection points of the diffusion couples by means of EPMA technique coupled with the Whittle and Green method. With the experimentally determined interdiffusion coefficients and the critically reviewed experimental diffusivities available in the literature, the atomic mobilities of fcc Co-V-Mo alloys were assessed using Diffusion Controlled Transformation (DICTRA) software. The quality of the assessed atomic mobilities was confirmed by the comprehensive comparisons between various DICTRA-calculated diffusion behaviors and the experimental ones, including concentration profiles and diffusion paths. The results will be critically examined against direct measurements of the tracer diffusivities by the radiotracer technique.