Abstract
The constitution of Co–Zr alloys in the Zr2Co–Zr region is studied by physicochemical analyses (metallography, X-ray diffraction, differential thermal analysis). It is shown that the Zr3Co phase exists in the system, though the literature data on its existence and formation are contradictory. It forms in solid state at 981°C via peritectoid reaction + ↔ , and its homogeneity range at 900°C is no larger than 1 at.%. The eutectic point L ↔ + is found in the alloy with ~22 at.% Co. The microhardness of the Zr2Co and Zr3Co phases is determined.
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