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Bcc / B2 phase equilibria and phase transformation from B2 to β’ in refractory Nb-X(Pd, Rh, Ir)-Al

Published online by Cambridge University Press:  18 January 2017

T. Yamanouchi ,
S. Miura ,
M. Ohno  and
K. Ikeda
T. Yamanouchi*
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University; Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan
S. Miura
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University; Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan
M. Ohno
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University; Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan
K. Ikeda
Affiliation:
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University; Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan
*
†(Email: takuya_y@lms4-ms.eng.hokudai.ac.jp)
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Abstract

For the improvement of oxidation resistance of Nb-based alloys, PdAl-B2 is expected as Al reservoir for Al2O3 surface layer because it is in equilibrium with Nbss (bcc) phase. However, PdAl forms cracks during casting caused by B2 -> β’ transformation. To suppress B2 -> β’ transformation, Rh, Ru and Ir were chosen as additive elements. It is found that bcc / B2 two-phase field in Nb-Pd-Ir-Al system is limited to be small fraction of Ir, while (Pd,Rh)Al-B2 is in equilibrium with bcc solid solution in a wide composition range and addition of Rh prevents occurrence of B2 -> β’ transformation. Composition range of (Pd,Ru)Al-B2 in equilibrium with bcc phase is wider than (Pd,Ir)Al-B2 but narrower than (Pd,Rh)Al-B2. Rh and Ru addition are also beneficial for improving eutectic temperature of Nb-bcc / B2 aluminide two-phase alloys.

Keywords

phase equilibriaphase transformationNb
Type
Articles
Information
MRS Advances , Volume 2 , Issue 25: Mechanical Behavior and Failure Mechanisms of Materials , 2017 , pp. 1335 - 1340
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

*

Graduate Student

References

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