Experimental investigation and thermodynamic description of the Fe–Mo–Zr system. (September 2021)

• Record Type: Journal Article
• Authors: Du, Zeting; Zou, Lei; Guo, Cuiping; Ren, Xueping; Li, Changrong
• Is Part Of: Calphad. Volume 74(2021)
• Publication Date: 2021-09
• Subjects: Fe–Mo–Zr system -- Isothermal section -- Liquidus surface projection -- CALPHAD method; 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.2021.102314
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: The phase relations at 1273 K and liquidus surface projection of the Fe–Mo–Zr system were investigated by means of electron probe micro-analyzer (EPMA), scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD) methods. The composition range of C14 Laves phase was determined at 1273 K. The maximum solubility of Mo in C15–Fe2 Zr, Mo in Fe23 Zr6, Fe in C15–Mo2 Zr and Zr in μ phase is about 4.8, 0.6, 17.7 and 4.6 at.% at 1273 K, respectively. The isothermal section at 1273 K of the Fe–Mo–Zr system on the whole composition ranges was constructed using 30 annealed alloys. In the liquidus surface projection, the primary solidification phase regions of bcc(Fe), C15–Fe2 Zr, C14, μ, R, σ, bcc(Zr), C15–Mo2 Zr and bcc(Mo) were experimentally confirmed using 31 as-cast alloys. Based on the experimental data in literature and the present work, the Fe–Mo–Zr system was optimized using CALPHAD method, and a set of self-consistent reliable thermodynamic parameters was obtained. Highlights: The isothermal section at 1273 K and liquidus surface projection of the Fe–Mo–Zr system were investigated by SEM/EDS and XRD. The homogeneity ranges of C14 and C15 laves phases were determined. A set of self-consistent reliable thermodynamic parameters for Fe–Mo–Zr system was obtained.