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High-Temperature Materials Based on Quaternary Ir-Nb-Ni-Al Alloys

Published online by Cambridge University Press:  21 March 2011

X. Yu
Affiliation:
High-Temperature Materials 21 Project, National Research Institute for Metals Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
Y. Yamabe-Mitarai
Affiliation:
High-Temperature Materials 21 Project, National Research Institute for Metals Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
Y. Ro
Affiliation:
High-Temperature Materials 21 Project, National Research Institute for Metals Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
S. Nakaza
Affiliation:
High-Temperature Materials 21 Project, National Research Institute for Metals Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
H. Harada
Affiliation:
High-Temperature Materials 21 Project, National Research Institute for Metals Sengen 1–2–1, Tsukuba, Ibaraki 305–0047, Japan
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Abstract

A novel method to develop new quaternary alloys with an fcc/L12 coherent structure is proposed. This paper reviews the development of quaternary Ir-Nb-Ni-Al alloys. The microstructure, lattice misfit, and compressive 0.2% flow stress of 15 kinds of alloys were investigated systematically. Two kinds of coherent structures, fcc/L12-Ir3Nb and fcc/ L12-Ni3Al, were observed in most alloys. Two two-phase structures, fcc+L12-Ir3Nb and fcc+L12-Ni3Al, were observed in Ir-rich and Ni-rich regions, respectively. The lattice misfits of quaternary Ir-Nb-Ni-Al alloys were higher than those of Ni- or Ir-base binary alloys. The compressive 0.2% flow stresses of quaternary alloys increased dramatically compared with those of Ni-base superalloys. The quaternary alloys located in the Ir-rich region were not only had higher strength but also better ductility than Ir-base binary alloys. The potential use of quaternary alloys is discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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References

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