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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.37: Poster
Montag, 16. März 2020, 18:15–20:00, P4
Interdiffusion and atomic mobility in Mo-Zr and Mo-Nb-Zr bcc phase alloys — •Baixue Bian1, Yong Du2, Sergiy Divinski1, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Gemany — 2State Key Laboratory of Powder Metallurgy, Central South University, 410083 Changsha, China
Accurate kinetic characteristics of refractory alloys are critical for understanding and tuning the phase transformation and microstructure evolution during homogenization and precipitation. In this work, the diffusion couple technique, Bltzmann-Matano and Matano-Kirkaldy methods were applied to measure the interdiffusion coefficients of bcc phase Mo-Zr binary alloys and Mo-Nb-Zr ternary alloys at 1423-1523 K, respectively. Subsequently, on the basis of the presently obtained interdiffusivities together with the thermodynamic descriptions for bcc Mo-Nb-Zr system, the atomic mobility parameters of Mo, Nb and Zr elements were assessed by means of DICTRA software package. Moreover, the comprehensive comparisons between the experimental diffusion properties (i.e., interdiffusivities, composition profiles, and diffusion paths) and the calculated /model-predicted data due to the present atomic mobilities were conducted in order to verify the reliability of the mobility values. The present atomic mobilities for bcc Mo-Nb-Zr system are shown to provide the accurate interdiffusivity matrix over a wide composition range.