Abstract
The low-temperature Fe-Ni phase diagram was assessed experimentally by investigating Fe-Ni regions of meteorites using high resolution analytical electron microscopy techniques. The present phase diagram differs from the available experimental phase diagram based on observations of meteorite structure, but it is consistent with the available theoretical diagram in that α/Ni3Fe equilibrium was found at low temperatures. The a phase containing 3.6 wt.% Ni is in local equilibrium with the γ′ (Ni3Fe) phase containing 65.5 wt.% Ni, while the γ′' (FeNi) phase is present as a metastable phase. The new phase diagram incorporates a monotectoid reaction (γ1 → α + γ2, where (γ1 is a paramagnetic fcc austenite, a is a bcc ferrite, and γ2 is a ferromagnetic fcc austenite) at about 400 °C, a eutectoid reaction (γ2 → α + γ′) at about 345 °C, and a miscibility gap associated with a spinodal region at low temperatures. The miscibility gap is located between 9.0 and 51.5 wt. % Ni at ∼200 °C. The new low-temperature Fe-Ni phase diagram is consistent with all the phases observed in the metallic regions of meteorites.
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Cited References
P. Leech and C. Sykes, “The Evidence for a Superlattice in Nickel-Iron Alloy Ni3Fe,”Philos. Mag., 27, 742–753 (1939).
J. Paulevé, D. Dautrppe, J. Laugier, and L. Néel, “A New Order-Disorder Transition in Fe-Ni (50-50),”J. Phys., 23, 841–843 (1962).
T. Heumann and G. Karsten, “The Carbonyl Method and Vapor Deposition for Determining Equilibrium Phases at Low Temperatures Taking Iron-Nickel Alloys as an Example,”Arch. Eisenhiittenwes., 34, 781–786 (1963).
B.N. Powell, “Petrology and Chemistry of Mesosiderites-I. Textures and Composition of Nickel-Iron,”Geochem. Cosmochem. Acta, 55, 789–810 (1969).
W.F. Schlosser, “A Model for the Invar Alloys and the Fe-Ni System,”J. Phys. Chem. Solids, 32, 939–949 (1971).
G. Cliff and G.W. Lorimer, “The Quantitative Analysis of Thin Specimens,”J. Microsc., 103, 203–207 (1975).
O. Kubaschewski, K. Geiger, and K. Hack, “The Thermochemical Properties of Iron-Nickel Alloys,”Z. Metallkd., 68, 337–341 (1977).
J.F. Petersen, M. Aydin, and J.M. Knudsen, “Mössbauer Spectroscopy of an Ordered Phase (Superstructure) of FeNi in an Iron Meteorite, ”Phys. Lett. A, 62, 192–194 (1977).
A. Chamberod, M. Roth, and L. Billard, “Small Angle Neutron Scattering Invar Alloys,”J. Magn. Magn. Mater., 7, 101–103 (1978).
A. Chamberod, J. Laugier, and J.M. Penisson, “Electron Irradia: tion Effects on Iron-Nickel Invar Alloys,”J. Magn. Magn. Mater., 10, 139–144 (1979).
S.E. Haggerty and B.M. McMahon, “Magnetite-Sulfide-Metal Complexes in the Allende Meteorite,”Geochem. Cosmochem. Acta, 77, 851–870 (1979).
R.S. Clarke, Jr. and E.R.D. Scott, “Tetrataenite-Ordered FeNi, a New Mineral in Meteorites“Amer. Mineral., 65, 624–630 (1980).
J.K.v. Deen and F.v.d. Woude, “Phase Diagram of the Order-Disorder Transition in Ni3Fe,”J. Phys., 41, C1, 367–368 (1980).
J.R.C. Guimarães, J. Danon, R.B. Scorzelli, and I.S. Azevedo, “Phase Stability on Iron-Nickel Invar Alloys,”J. Phys. F, Met. Phys., 70, L197–202 (1980).
B.M. McMahon and S.E. Haggerty, “Experimental Studies Bearing on the Magnetite-Alloy-Sulfide Association in the Allende Meteorite: Constraints on the Conditions of Chondrule Formation,”Geochem. Cosmochem. Acta, 14, 1003–1025 (1980).
A.D. Romig, Jr. and J.I. Goldstein, “Determination of the Fe-Ni and Fe-Ni-P Phase Diagrams at Low Temperatures (700 to 300 °C),”Metall. Trans. A, 11, 1151–1159 (1980).
J. Danon, M. Christophe, C. Jehanno, K. Keil, C.B. Gomaes, and R.B. Scorzelli, “Awaruite (Ni3Fe) in the Genomict LL Chondrite Parambu: Formation under High FeO2,”Meteoritics, 16, 305 (1981).
J.K.v. Deen and F.v.d. Woude, “Phase Diagram of the Order-DisorderTransitioninNi3Fe,”Metall., 29, 1255–1262 (1981).
R.A. Jago, P.E. Clark, and P.L. Rossiter, “The Santa Catharina Meteorite and the Equilibrium State of Fe-Ni Alloys,”Phys. Status Solidi(a), 74, 247–254 (1982).
O. Kubaschewski,Iron Binary Phase Diagrams, Springer Verlag (1982).
J.F. Albertsen, H.P. Nielsen, and V.F. Buchwald, “On the Fine Structure of Meteoritical Taenite/Tetrataenite and Its Interpretation,”Phys. Scr., 27, 314–320 (1983).
H. Morita, A. Chamberod, and S. Steinemann, “Electron Irradiation Effects on the Curie Temperature of Fe-Ni Invar Alloys,”J. Phys. F, Met. Phys., 14, 3053–3059 (1984).
Y.Y. Chuang, K. Hsieh, and Y.A. Chang, “A Thermodynamic Analysis of the Phase Equilibria of the Fe-Ni System above 1200K,”Metall. Trans. A, 17, 1373–1380 (1986).
Y.Y. Chuang, Y.A. Chang, R. Schmid, and J.C. Lin, “Magnetic Contributions to the Thermodynamic Functions of Alloys and the Phase Equilibria ofFe-Ni System below 1200K,”Metall. Trans. A, 77, 1361–1372 (1986).
T. Nagatani, S. Saito, M. Sato, and M. Yamada, “Development of an Ultra High Resolution Scanning Electron Microscope by Means of a Field Emission Source and In-Lens System,”Scanning Microsc., 7, 901–909 (1987).
J. Lin and Y.A. Chang, “Magnetic-Induced Tricritical Points in Alloys,”Metall. Trans. A, 79, 441–446 (1988).
K.B. Reuter, D.B. Williams, and J.I. Goldstein, “Low Temperature Phase Transformations in the Metallic Phases of Iron and Stony Iron Meteorites,”Geochem. Cosmochem. Acta, 52, 617–626 (1988).
K.B. Reuter, D.B. Williams, and J.I. Goldstein, “Determination of the Fe-Ni Phase Diagram below 400°C,”Metall. Trans. A, 20, 719–725 (1989).
K.B. Reuter, D.B. Williams, and J.I. Goldstein, “Ordering in the Fe-Ni System under Electron Irradiation,”Metall. Trans. A, 20, 711–718 (1989).
G.W. Kellemeyn, A.E. Rubin, and J.T. Wasson, “The Compositional Classification of Chondrites: V. The Karoonda (CK) Group of Carbinaceous Chondrites,”Geochem. Cosmochem. Acta, 55, 881–891 (1991).
A.E. Rubin, “Euhedral Awaruite in the Allende Meteorite: Implications for the Origin of Awaruite- and Magnetite-Bearing Nodules inCV3 Chondrites,”Amer. Mineral., 76, 1356–1362 (1991).
L.J. Swartzendruber, V.P. Itkin, and C.B. Alcock, “The Fe-Ni (Iron-Nickel) System,”J. Phase Equilibria, 12, 288–312 (1991).
C.W. Yang, D.B. Williams, and J.I. Goldstein, “New Cooling Rate Indicator for Metal Particles in Meteorites,”Meteoritics, 29, 1529–1530 (1994).
J. Zhang, D.B. Williams, and J.I. Goldstein, “Decomposition of Fe-Ni Martensite: Implications for the Low-Temperature (<500°C) Fe-Ni Phase Diagram,”Met. Mat. Trans. A, 25, 1627–1637 (1994).
X. Hua, D.D. Eisenhour, and P.R. Buseck, “Cobalt-Rich, Nickel-Poor Metal (Wairauite) in the Ningqiang Carbonaceous Chondrite,”Meteoritics, 30, 106–109 (1995).
D.G. Rancourt and R.B. Scorzelli, “Low-Spin γ-Fe-Ni γ1s) Proposed as a New Mineral in Fe-Ni-Bearing Meteorites: Epitaxial Intergrowth of γIS and Tetrataenite as a Possible Equilibrium State at -20-40at.%Ni,”J. Magn. Magn. Mater., 750, 30–36 (1995).
C.W. Yang, D.B. Williams, and J.I. Goldstein, “Low Temperature Phase Decomposition in Meteoritic Metal—Part I: Microstructure and Microchemistry of Metallic Phases,” submitted toGeochem. Cosmochem. Acta (1996).
C.W. Yang, D.B. Williams, and J.I. Goldstein, “Low Temperature Phase Decomposition in Meteoritic Metal—Part II: Thermodynamic and Kinetic Considerations of Microstructural Development,” submitted toGeochem. Cosmochem. Acta (1996).
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Yang, C.W., Williams, D.B. & Goldstein, J.I. A revision of the Fe-Ni phase diagram at low temperatures (<400 °C). JPE 17, 522–531 (1996). https://doi.org/10.1007/BF02665999
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DOI: https://doi.org/10.1007/BF02665999