Abstract

The phase constitution of Ir–Nb–Zr alloys with a composition below 25 at% (Nb+Zr) was investigated by microstructure observation using scanning electron microscopy (SEM), composition analysis using electron probe microscopy analysis (EPMA), and phase identification using X-ray diffraction analysis (XRD). Partial isothermal sections of the Ir–Nb–Zr ternary system were determined at 1773, 2073, and 2373 K. It was found that the f.c.c. and L1 2 two-phase regions, which are shown in the Ir–Nb and Ir–Zr binary systems, were connected from the Ir–Nb side to the Ir–Zr side in the Ir–Nb–Zr ternary system. The potential of Ir–Nb–Zr alloys as high-temperature materials is discussed in terms of the microstructure and the lattice misfit between the f.c.c. and L1 2 phases.

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