The mechanical alloying (MA) of an equiatomic mixture of copper and iron, which is reported to be immiscible in the equilibrium phase diagram, leads to a metastable Cu50Fe50 alloy, which reverts to its constituents on isothermal annealing at 300 degrees C. We have studied the mechanism of alloy decomposition by in-situ annealing using neutron diffraction and, for the first time for this system, neutron small-angle scattering. Evidence has been found of spinodal decomposition, which was predicted in this system on the basis of thermodynamic arguments. The neutron small-angle scattering data point to the existence of fluctuations in scattering length density with a length scale of 200-300 Angstrom in the early stages of annealing the Cu50Fe50 alloy.

A study of phase separation in metastable Cu50Fe50 alloys by neutron diffraction and neutron small-angle scattering / Enzo, Stefano; Mulas, Gabriele Raimondo Celestino Ettore; Frattini, R.; Cooper, R. J.; Cowlam, N.; Principi, G.. - In: PHILOSOPHICAL MAGAZINE. B. PHYSICS OF CONDENSED MATTER. STATISTICAL MECHANICS, ELECTRONIC, OPTICAL AND MAGNETIC PROPERTIES. - ISSN 1364-2812. - 76:4(1997), pp. 471-482. [10.1080/01418639708241112]

A study of phase separation in metastable Cu50Fe50 alloys by neutron diffraction and neutron small-angle scattering

ENZO, Stefano;MULAS, Gabriele Raimondo Celestino Ettore;
1997

Abstract

The mechanical alloying (MA) of an equiatomic mixture of copper and iron, which is reported to be immiscible in the equilibrium phase diagram, leads to a metastable Cu50Fe50 alloy, which reverts to its constituents on isothermal annealing at 300 degrees C. We have studied the mechanism of alloy decomposition by in-situ annealing using neutron diffraction and, for the first time for this system, neutron small-angle scattering. Evidence has been found of spinodal decomposition, which was predicted in this system on the basis of thermodynamic arguments. The neutron small-angle scattering data point to the existence of fluctuations in scattering length density with a length scale of 200-300 Angstrom in the early stages of annealing the Cu50Fe50 alloy.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/58655
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