Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-28T01:09:40.365Z Has data issue: false hasContentIssue false
  • English
  • Français

Low temperature magnetic transition and high temperature oxidation in INCONELa) alloy 718

Published online by Cambridge University Press:  31 January 2011

Mohindar S. Seehra  and
V. Suresh Babu
Mohindar S. Seehra*
Affiliation:
Physics Department, West Virginia University, Morgantown, West Virginia 26506–6315
V. Suresh Babu
Affiliation:
Physics Department, West Virginia University, Morgantown, West Virginia 26506–6315
*
b) Address correspondence to this author.
Get access

Abstract

X-ray diffraction and temperature dependent (5 K–380 K) magnetic measurements have been carried out in INCONEL 718 superalloy before and after high temperature aging treatments. (INCONEL is a trademark of the INCO family of companies.) The nominal composition of this alloy is Ni (52.5%), Cr (19.0%), Fe (18.5%), Nb (5.1%), Mo (3.0%), Ti (0.9%), Al (0.5%), Cu (0.15%), and C (0.08%), and it yields an x-ray diffraction pattern consisting of a fcc phase with α = 3.5987 (3) Å and an orthorhombic phase associated with δ-Ni3Nb. It is concluded that the fcc pattern is due to both the γ austenitic phase and γ′ Ni3(Al, Ti) phase of alloy 718. The standard annealing and aging treatment carried out in air at temperatures between 621 and 982 °C produces surface oxides (Cr, Fe)2O3 and FeNbO4 (which are easily removed by etching and polishing) and contracts the lattice. Magnetic measurements show a distinct phase transition at Tc = 14 K, which has been attributed to the γ′-Ni3(Al, Ti) phase by the process of elimination and by observing that it has most of the characteristics of the weak itinerant ferromagnet Ni74.5Al25.5. This transition may have some effects on the cryogenic applications of this alloy.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 5 , May 1996 , pp. 1133 - 1136
Copyright
Copyright © Materials Research Society 1996

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

a)

INCONEL is a trademark of the INCO family of companies.

References

REFERENCES

1. See, e.g., Loria, E. A., Metals, J., 36, July 1988, and references therein.Google Scholar
2.Superalloys–A Technical Guide, edited by Bradley, E. F. (ASM INTERNATIONAL, Metals Park, OH, 1988), pp. 75–87.Google Scholar
3.Sundararaman, M., Mukhopadhyay, P., and Banerjee, S., Metall. Trans. A 19A, 453 (1988).CrossRefGoogle Scholar
4.Corey, C. L. and Potter, D. I., J. Appl. Phys. 38, 3894 (1967).CrossRefGoogle Scholar
5.Kozubski, R. and Cadeville, M. C., J. Phys. F: Met. Phys. 18, 2569 (1988).CrossRefGoogle Scholar
6.Cardellini, F., Cleri, F., Mazzone, G., Montone, A., and Rosato, V., J. Mater. Res. 8, 2504 (1993).CrossRefGoogle Scholar
7.Fang, T., Kennedy, S. J., Quan, L., and Hicks, T. J., J. Phys: Condens. Matter 4, 2405 (1992).Google Scholar
8. See, e.g., Kollie, T. G., Phys. Rev. B 16, 4872 (1977), and references therein.CrossRefGoogle Scholar
9.Smith, T. F., Kaiser, A. B., and White, G. K., Int. J. Thermophys. 12, 627 (1991).CrossRefGoogle Scholar
10.Suresh Babu, V., Pavlovic, A. S., and Seehra, M. S., J. Appl. Phys. (April 1996, in press).Google Scholar
11.Wasserman, E. F., in Ferromagnetic Materials, edited by Buschow, K. H. J. and Wohlfarth, E. P. (North-Holland, Amsterdam 1990), Vol. 5, p. 258.Google Scholar
12.Ling, P. C. and Hicks, T. J., J. Phys. F: Metal Phys. 3, 697 (1973);CrossRefGoogle Scholar
see also Buis, N., Franse, J.J. M., and Brommer, P.E., Physica 106B, 1 (1981).Google Scholar
13.de Boer, F. R., Schinkel, C. J., Biesterbos, J., and Proost, S., J. Appl. Phys. 40, 1049 (1969).CrossRefGoogle Scholar
14.Min, B. I., Freeman, A. J., and Jansen, H. J. F., Phys. Rev. B 37, 6757 (1988-II);CrossRefGoogle Scholar
Suzuki, K. and Masuda, Y., J. Phys. Soc. Jpn. 54, 326 (1985);CrossRefGoogle Scholar
Moriya, T., J. Magn. Magn. Mater. 14, 1 (1979).CrossRefGoogle Scholar

An addendum has been issued for this article:

Erratum and Addendum