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Influence of Ni Addition on Mechanical Properties and Fracture Behaviors of Ir-15Nb Two-Phase Refractory Superalloys

Published online by Cambridge University Press:  10 February 2011

Yuefeng Gu ,
Y. Yamabe-Mitarai ,
Y. Ro ,
T. Yokokawa  and
H. Harada
Yuefeng Gu
Affiliation:
(On leave from Shanghai Jiao Tong University, Shanghai 200030, P. R. China)
Y. Yamabe-Mitarai
Affiliation:
National Research Institute for Metals, 1–2-1 Sengen, Tsukuba, Ibarake 305–0047, Japan
Y. Ro
Affiliation:
National Research Institute for Metals, 1–2-1 Sengen, Tsukuba, Ibarake 305–0047, Japan
T. Yokokawa
Affiliation:
National Research Institute for Metals, 1–2-1 Sengen, Tsukuba, Ibarake 305–0047, Japan
H. Harada
Affiliation:
National Research Institute for Metals, 1–2-1 Sengen, Tsukuba, Ibarake 305–0047, Japan
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Abstract

Ir-based alloys with fcc-L12 two-phase coherent structure, which are called “refractory superalloys”, have good potentiality as structure materials used at ultra-high temperatures up to 2000 °C. Preliminary results showed that the refractory superalloys failed predominately by brittle intergranular fracture at room temperature even though they showed higher strength at that temperature. This paper will present the influence of nickel (Ni) addition on mechanical properties and fracture behaviors of one of these alloys, Ir-15at%Nb. The results indicated that Ni addition was beneficial to the compression ductility and strength of two-phase Ir-15at%Nb alloy when Ni content was below the optimum content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK7.10.1
Copyright
Copyright © Materials Research Society 1999

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References

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