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Ternary Re-Cr-Ni alloy samples were melted and pulled simultaneously in a tetra-arc furnace and rapidly water-quenched after heat treatment at 1150 °C for 2400 h. The microstructures of the samples that had been water-quenched after heat treatment were observed and the Re, Cr and Ni concentration in the constituent phases were measured using an electron probe microanalyzer (EPMA). In the cross-sectional structure of the obtained alloy samples, the upper portion consists of γ, σ and δ phases. By contrast, the middle and lower portions consists of γ and σ phases. It was found that the amount of Cr in the σ phase coexisting with the γ phase ranges from 27.7 to 29.0 at%, while the amount of Cr in the σ phase coexisting with the γ and δ phases is 25.2 at%. The amount of Cr in the σ phase decreases with increasing Ni concentration in the pulled part.

Investigation of the Cross-Sectional Structure and Isothermal Section at 1150°C of a Nb-Re-Si Alloy Fabricated Using a Tetra-Arc Furnace