Abstract
The possibility that two types of phase transformations - the radiation-induced and thermally activated decomposition of austenite to nickel-enriched and nickel-depleted FCC components - take place in the previously thought of as the single-phase high-temperature (773-973 K) range of the Fe-Ni equilibrium diagram was analyzed. The Mossbauer and electron microscopic investigations showed that the purposefully produced concentration-inhomogeneous FCC alloys of iron with 32-34% Ni were fully homogenized in that high-temperature region. This fact indicates to the absence of the thermal decomposition dome in the said areas of the Fe-Ni equilibrium diagram.
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