Diffusivity and Atomic Mobility in fcc Ni-Fe-V System: Experiment and Modeling
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Diffusivity and Atomic Mobility in fcc Ni-Fe-V System: Experiment and Modeling Huixin Liu1,2 • Shiyi Wen1,2 • Yuling Liu1,2 • Yong Du1,2 • Qianhui Min1,2 Shuhong Liu1,2 • Peng Zhou3
•
Submitted: 9 February 2020 / in revised form: 29 May 2020 Ó ASM International 2020
Abstract In this work, the ternary diffusion behavior in fcc Ni-Fe-V system has been investigated by means of solid-state diffusion couple technique at 1000, 1100 and 1200 °C. The composition-dependent ternary interdiffusion coefficients were determined via Whittle-Green method, in which the uncertainties were calculated by error propagation and the reliability was validated via thermodynamic constraints. The ternary main interdiffusion ~Ni ~Ni coefficients of D FeFe and DVV were compared with the ones in binary Fe-Ni and Ni-V systems in the literature, respectively. The obtained interdiffusion coefficients combined with the thermodynamic description were employed to evaluate the atomic mobilities in fcc Ni-Fe-V system through the DICTRA (DIffusion-Controlled
This invited article is part of a special tribute issue of the Journal of Phase Equilibria and Diffusion dedicated to the memory of Gu¨nter Effenberg. The special issue was organized by Andrew Watson, Coventry University, Coventry, United Kingdom; Svitlana Iljenko, MSI, Materials Science International Services GmbH, Stuttgart, Germany; and Rainer Schmid-Fetzer, Clausthal University of Technology, Clausthal-Zellerfield, Germany. & Yuling Liu [email protected] & Yong Du [email protected] 1
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2
National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China
3
Hunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
TRAnsformations) software package. A comprehensive comparison between the model-predicted diffusion behaviors and the experimental ones, including concentration/ interdiffusion-flux distribution and diffusion path, confirms the reliability of the present atomic mobility. Besides, based on the presently obtained atomic mobilities, threedimensional surfaces for the diagonal interdiffusivity at 1000, 1100 and 1200 °C were plotted. Furthermore, threedimensional planes of the activation energy and frequencyfactor of main interdiffusivities were evaluated using the Arrhenius equation. This work is part of our work to build a general kinetic database for soft magnetic alloys and cemented carbides. Keywords activation energy and frequency-factor atomic mobility diffusion couples diffusivities fcc Ni-Fe-V system
1 Introduction The Ni-Fe based soft magnetic alloys are of considerable interest owing to their wide applications in electromagnetic devices, such as pulse transformer material, inductor core, functional magnetic material sensors, etc.[1–3] In addition, cemen
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