Atomic mobilities and diffusivities in U-X (X = Nb, Zr, Ti) bcc alloys. (June 2018)

• Record Type: Journal Article
• Authors: Bian, Baixue; Zhou, Peng; Wen, Shiyi; Du, Yong
• Is Part Of: Calphad. Volume 61(2018)
• Page Start: 85
• Page End: 91
• Publication Date: 2018-06
• Subjects: Atomic mobility -- Diffusivity -- BCC_A2 -- U-based alloys; Phase diagrams -- Data processing -- Periodicals; Thermochemistry -- Data processing -- Periodicals; Diagrammes de phases -- Informatique -- Périodiques; Thermochimie -- Informatique -- Périodiques; Thermodynamica; Electronic journals; 541.363
• DOI: 10.1016/j.calphad.2018.02.003
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: Based on a critical evaluation of experimental diffusion data available in the literature and the updated thermodynamic descriptions within the CALPHAD framework, the atomic mobilities of U, Nb, Ti, and Zr in U-X(X=Nb, Zr, Ti) bcc alloys were assessed with the DICTRA software. For each system, comprehensive comparison shows that a good agreement between the calculated and experimental data was obtained. The developed mobilities in conjunction with the thermodynamic parameters were also used to describe the marker movement in the U/Zr as well as U/Ti diffusion couples, and a satisfactory result was obtained. The presently obtained atomic mobilities can describe diffusion phenomenon more accurately than previously reported atomic mobilities. Graphical abstract: fx1 Highlights: A new set of self-consistent mobility database for U, Nb, Zr, Ti bcc phase, was established with the CALPHAD method. Comprehensive comparisons between the calculated and experimental data show the new parameters lead to a better agreement. To further verify the accuracy of the obtained mobility parameters in this work, the concentration curves are reproduced.