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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.
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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

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Footnotes

a)

INCONEL is a trademark of the INCO family of companies.

References

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