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- Title
Experimental Determination of Phase Equilibria in the La-Co-Zr System.
- Authors
Li, T. B.; Liu, X. Y.; Cheng, W. F.; Tan, C.; Yao, Q. R.; Wang, J.; Rao, G. H.; Zhou, H. Y.
- Abstract
The phase equilibria of the La-Co-Zr ternary system at 873 K and 1073 K were studied for the first time using equilibrated alloys employing scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and x-ray diffraction (XRD). The crystal structures of the formed phases in La-Co-Zr alloys annealed at 873 K and 1073 K were identified through Rietveld refinement of the XRD results. The SEM-EDS and XRD results reveal that no ternary intermetallic compounds were detected in the La-Co-Zr ternary system and the binary intermetallic compound La5Co19 was not observed in the La-Co binary system. The solid solubility of the third element in the binary La-Co and Co-Zr intermetallic compounds was measured by EDS composition measurements. It was found that the maximum solid solubility of Zr in LaCo5 and LaCo13 is 1.8 and 4.0 at.% at 1073 K and it is 2.3 and 4.7 at.% at 873 K, respectively, while the maximum solid solubility of La in Co23Zr6 and Co2Zr is 1.3 and 1.6 at.% at 873 K and it is 3.8 and 6.1 at 1073 K. Furthermore, the solid solubility of Zr and La in the other La-Co and Co-Zr intermetallic compounds is negligible. Finally, the La-Co-Zr ternary isothermal sections at 873 K and 1073 K were established.
- Subjects
INTERMETALLIC compounds; PHASE equilibrium; X-ray diffraction; TERNARY system; RIETVELD refinement
- Publication
Journal of Phase Equilibria & Diffusion, 2024, Vol 45, Issue 4, p804
- ISSN
1547-7037
- Publication type
Article
- DOI
10.1007/s11669-024-01135-6