The Constitution of Со–Zr Phase Diagram

Abstract

The constitution of the Co–Zr system 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 °С is no larger than 1 at.%. The eutectic point is found in the alloy with ~22 at.% Co. Microhardness of the Zr₂Co and Zr₃Co phases is determined.