Фазовая диаграмма системы Er-Ti

К оглавлению: Другие диаграммы (Others phase diargams)


Er-Ti (Erbium-Titanium) J.L. Murray There is general agreement that the Ti-RE phase diagrams are characterized by the absence of intermetallic compounds, limited mutual solubilities in the solid state, and often miscibility gaps in the liquid phase. The Ti-Er system conforms to this pattern. The assessed diagram is drawn from thermodynamic calculations performed as part of the present evaluation. [60Lov] measured liquidus and solidus temperatures by differential thermal analysis and optical pyrometry for alloys containing 61 to 99 at.% Er. The eutectic temperature was reported to be 1320 с 20 C, based on the optical pyrometric data. The eutectic composition was estimated as 74 at.% Er, based on metallographic results. [60Bec] reported some metallographic evidence of liquid immiscibility, but thermodynamic calculations suggest that although the miscibility gap lies close to the liquidus, it is metastable in this system. [76Wan] used transmission electron microscopy to examine splat-cooled Ti-Er alloys for evidence of metastable extension of the solid solubility of Ti in ( Er). The observed maximum solubility was about 5 at.%, representing a possible slight (~1 at.%) extension from the equilibrium value. 60Bec: R. Beck, U.S. At. Energy Comm. LAR-10, 93 (1960). 60Lov: B. Love, WADD Tech. Report 60-74, Part I (1960). 76Wan: R. Wang, Mater. Sci. Eng., 7(3), 135-140 (1976). Published in Phase Diagrams of Binary Titanium Alloys, 1987. Complete evaluation contains 2 figures, 3 tables, and 5 references. Special Points of the Ti-Er System