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The isothermal section at 1 050 °C and the liquidus projection in the Co-rich portion of the ternary Co–Ti–Zr system were determined. The microstructures and solidification paths of the as-cast alloys were established experimentally. The constituent phases and their compositions of both as-cast and heat-treated alloys were investigated by means of optical microscopy, X-ray diffraction and electron probe microanalysis. No ternary compound was observed. For the Co-rich portion of the isothermal section at 1 050 °C, there are four three-phase regions, αCo + TiCo 3  + TiCo 2  (h), αCo + TiCo 2  (h) + (Ti,Zr)Co 2  (c), αCo + (Ti,Zr)Co 2  (c) + Zr 6 Co 23  and αCo + Zr 2 Co 11  + Zr 6 Co 23 . For the investigated liquidus projection, there exist six primary crystallization fields: αCo, TiCo 3 , TiCo 2  (h), (Ti,Zr)Co 2  (c), Zr 2 Co 11  and Zr 6 Co 23 ; three transition invariant reactions, L + αCo → TiCo 3  + TiCo 2  (h), L + (Ti,Zr)Co 2  (c) → αCo + TiCo 2  (h), and L + Zr 6 Co 23  → αCo + Zr 2 Co 11 ; and one eutectic invariant reaction of L → αCo + (Ti,Zr)Co 2  (c) + Zr 6 Co 23 .

Experimental study on phase relationships in the Co-rich portion of the Co–Ti–Zr system