Magnetic state, elastic constants, and longwave static displacements of atoms in γ-FeNi alloys

The experimental results on the concentration and temperature behavior of longwave (both transverse and longitudinal) static displacements of atoms, as well as the data on the elastic constants (derived from neutron and ultrasonic measurements) of γ-FeNi alloys, are reported. The relationship between the alloy magnetic state and the above-mentioned parameters is discussed and these parameters are classified with respect to the premartensitic phenomena and the Invar effect.