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Towards a True Fe-Ni Phase Diagram

Published online by Cambridge University Press:  21 February 2011

P L. Rossiter  and
R. A Jago
P L. Rossiter
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria 3168, Australia
R. A Jago
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria 3168, Australia
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Abstract

A modification to the existing Fe-Ni phase equilibrium diagram is proposed that takes account of the low-temperature ordering reaction to FeNi. It is shown that true equilibrium is never attained during slow cooling of Fe-Ni alloys, even for iron meteorites (which cool extremely slowly). In all real cases, a metastable phase diagram applies, in which the depressed γ/α+γ solvus produces a more extensive γ+ FeNi phase field than for the equilibrium case. This enlarged phase field is used to explain the decomposition of supersaturated Fe-Ni to γ+ FeNi, which is observed only in iron meteorites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 407
Copyright
Copyright © Materials Research Society 1984

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References

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