Abstract
Ir-based refractory superalloys with an fcc and L12 two-phase structure similar to that in Ni-based superalloys but with considerably higher melting temperatures are proposed. First, the microstructure and strength are shown for several kinds of binary alloys. Then, the effect that the third element and the combination of Ni-Al with an fcc and L12 two-phase structure in binary alloys had on the lattice misfit, microstructure, and strength was investigated. The precipitation-hardening effect in Ir-based alloys was investigated and discussed in terms of precipitate morphology and lattice misfit. The creep properties of Ir-based alloys were also investigated.
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Acknowledgments
I would like to acknowledge the help of Dr. Y. Gu and Dr. X. Yu, who did part of this research. I thank Dr. Y. Ro and Mr. S. Nakazawa for their technical support. I am also grateful to Mr. S. Nishikawa and Mr. T. Maruko of Furuya Metal Co., LTD. for supporting Ir. Finally, this research was conducted under the auspices of the High-Temperature Materials for 21st centry (HTM 21) Project.
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Yamabe-Mitarai, Y. High-Temperature Strength of Ir-Based Refractory Superalloys. MRS Online Proceedings Library 646, 221–232 (2000). https://doi.org/10.1557/PROC-646-N3.6.1
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DOI: https://doi.org/10.1557/PROC-646-N3.6.1