Исследованы температурные зависимости динамического модуля сдвига, внутреннего трения и эволюция структуры субмикрокристаллической меди марки FRTP при нагреве.Установлено, что аномальный (до 50%) рост модуля сдвига меди с повышением температуры термообработки обусловлен возникновением двойников отжига

Changes in the dimensional and microstructural characteristics of the samples of two invar fcc alloys, Fe–35.0% Ni–0.49% Mn and Fe–30.9% Ni–1.23% C, have been investigated by X-ray diffraction, metallographic, and electron-microscopic methods after upsetting with the logarithmic deformations e = 0.5 and 1.1. It has been shown that the regularities of changes in the macroscopic dimensions of the samples, as well as in the parameters of structural elements, which are presented by coefficients of the shape change after upsetting, are common for both alloys, although they have some distinctions. These distinctions are caused by the presence of a second phase in the carbon-containing alloy, which is concentrated predominantly along the boundaries of structural elements and affects the changes in the size and microstructural characteristics, as well as by a higher density and greater uniformity of the defect distribution.

In a given article, the results of studies of the structure, which is formed during hydroextrusion (HE) with the strain epsilon = 0.45-3.47, and the features of its influence on the hardness and properties of the Fe-35% Ni Invar alloy are presented. As shown, the plastic deformation leads to formation of the textured substructures, size parameters of which vary in proportion to their disorientation and lie within the range of 50-120 nm, while maintaining the much larger structural elements with sizes of 500-2500 nm. Nonmonotonic variation of the elastic microstresses depending on the degree of deformation with a maximum rate of their growth up to the strain of 1.48 and its subsequent deceleration to epsilon = 3.47 are revealed and are explained by the peculiarities of formation of the hierarchy of size parameters of a substructure, disorientation of fragments, and degree of organization of the boundaries between them. Nonmonotonic work hardening of Invar alloys is revealed and is caused by a refinement of the substructure elements with increasing level of elastic microstresses and their dynamical-relaxation processes. Lower and relatively constant values of TCLE for deformed alloy, -0.26.10(-6)--0.73.10(-6) K-1, at temperatures of 200-300 K are determined.

The impact of deformation of Invar Fe-35 % Ni alloy by hydroextrusion at room temperature on structure and its properties was studied. Grinding of grains, the structure fragmentation on 60 nm blocks and continuous increasing microstresses with growing epsilon within the strain range of epsilon = 0.45-3.47 was shown. The multiple extrusion leads to a non-monotonic change of magnetic properties of the alloy (specific magnetization and the Curie temperature) and as a consequence to thermal expansion measured along the direction of the extrusion due to the microstresses growth and their partial relaxation. The hypothesis concerning the microstresses induced change of a balance between ferromagnetic and antiferromagnetic contributions to exchange interspin interaction is supposed.