In situ study of order-disorder transitions and anelasticity in Fe-26Al alloy

In situ neutron diffraction and internal friction were combined for the comparative analysis of structural and functional properties of Fe-26Al alloy. Three different alloy states were studied: after rapid solidification in graphite mold, after annealing at 900 °С (0.5 h) and water quenching, after annealing at 450 °С (24 h) and slow cooling. Structural phase states and microstructure types were determined. The obtained results make it possible establishing the relationship between the thermal treatments, microstructure, phase transformations on the one hand and anelastic (internal friction) properties on the other.