Abstract
The temperature dependences of the intensity of elastic diffuse neutron scattering from γ-FexNi100−x (x=57 and 68 at. %) alloy single crystals near basic reciprocal-lattice sites in the (110) plane are measured using a triaxial neutron spectrometer. New effects of instability of the γ-phase lattice with respect to long-wavelength (transverse and longitudinal) static atomic displacements have been detected. The displacements are found to depend on the iron concentration in the alloys and on temperature. The relations of these structural distortions to premartensitic phenomena and the invar effect in γ-FeNi alloys are discussed
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