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Figure 1
Metastable liquid miscibility gap and solidification microstructure in Ti-Ag alloys [1].
Ti-Ag alloy is characterized by a flat liquidus line in the binary phase diagram. In the Ti-rich Ti66.7Ag33.3 alloy, the conventionally cast ingot showed a dendritic structure that included Ti-Ag-based intermetallic compounds; on the other hand, the rapidly solidified melt-spun ribbon showed a particulate microstructure comprising Ag-rich globules and a Ti-rich matrix phase (Fig. 1) [1]. The formation of emulsion-like structures in the rapidly solidified specimens can be explained in terms of liquid phase separation. The metastable liquid miscibility gap in Ti-Ag alloy system can be discussed based on thermodynamics (Fig. 1). The occurrence of the liquid phase separation also can be seen in Ti-Nb-Ag alloy[2].
REFERENCES
[1] T. Nagase, M. Matsumoto, Y. Fujii, Journal of Alloys and Compounds, 738, 440-447 (2018)., "Microstructure of Ti-Ag immiscible alloys with metastable liquid phase separation", https://doi.org/10.1016/j.jallcom.2017.12.1388
[2] T. Nagase, M. Matsumoto, Y. Fujii, Microscopy, 66 S1, i22 (2017)., "Microstructure of Ti-Nb-Ag immiscible alloys with liquid phase separation", https://doi.org/10.1093/jmicro/dfx064
