Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-24T23:22:58.989Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected])
Get access

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Graduate Student

References

REFERENCES

Bewlay, B. P., Jackson, M. R., Zhao, J. -C. and Subramanian, P. R., Metall. Mater. Trans. A 34(10), 2043–2052 (2003).Google Scholar
Bewlay, B. P., Lewandowksi, J. J., and Jackson, M. R., JOM 49(8), 44–45 (1997).Google Scholar
Matsumura, Y., Fukumoto, M., Hayashi, S., Kasama, A., Iwanaga, I., Tanaka, R., Narita, T., Oxid. Met. 61, 105–124 (2004).CrossRefGoogle Scholar
Jackson, M. R., Bewlay, B. P., Rowe, R. G., Skelly, D. W., Lipsitt, H. A., JOM 48(1), 39–44 (1996).Google Scholar
Fukumoto, M., Matsui, R., Hara, M., Narita, T., J. Japan Inst. Metals 68(8), 548–551 (2004).CrossRefGoogle Scholar
Yamanouchi, T. and Miura, S., MRS proc. 1760, mrsf14-yy05–38 (2015).Google Scholar
Cerba, P., Vilasi, M., Malaman, B., Steinmetz, J., J. Alloys Compd. 201(1), 57–60 (1993).Google Scholar
Petzow, G., Effenberg, G., Ternary Alloys. A comprehensive compendium of evaluated constitutional data and phase diagrams. 6, 363–364 (1993).Google Scholar
Petzow, G., Effenberg, G., Ternary Alloys. A comprehensive compendium of evaluated constitutional data and phase diagrams. 6, 290–292 (1993).Google Scholar
Grushko, B., J. Alloys Compd. 557, 102–111 (2013).Google Scholar
Okamoto, H., J. Phase Equilib. Diffus. 30(2), 206–207 (2009).Google Scholar
Khoruzhaya, V. G., Kornienko, K. E., Martsenyuk, P. S., Velikanova, T. Ya., Powder Metall. Met. Ceram. 45 (5-6), 251–258 (2006).CrossRefGoogle Scholar
Boniface, T. D., Cornish, L. A., J. Alloys Compd. 234(2), 275–279 (1996).Google Scholar