The as-cast Fe2NiAl samples were treated in accordance with the following regime: water quenching from 1240 °C (after holding for 20 min); cooling from 1240 °C (after holding for 20 min) at a critical cooling rate up to an intermediate temperature Tq = 900 – 20 °С with subsequent water quenching. Detailed studies of the solid solution decomposition, microstructure and magnetic properties of the samples are reported. TEM investigations of the solid solution decomposition (β2→β + β2) in as cast Fe2NiAl alloy during cooling at a critical rate after homogenization showed that formation of the periodic modulated structure passes through an intermediate stage of destruction, leading to a drop of coercive force after quenching from 850 °C. It is shown that the "secondary" decomposition of the β2-phase inside modulated structure, formed at higher temperatures, is associated with a sharp change in the volume and composition of the β and β2phases due to the asymmetric shape of the miscibility gap in the Fe-Ni-Al system near 850 °C. Cooling of the cast Fe2NiAl alloy at a critical rate to room temperature leads to the formation of an optimal modulated structure and obtaining the maximum value of the coercive force Hc = 51.2 kA/m.Keywords: AlNi alloy, cooling at a critical rate,modulated microstructure, coercive force, Mössbauer spectra
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