Study of the effect of pre-magnetic treatment on the thermoplastic effect in aluminum alloys with ferromagnetic inclusions

The paper presents the results of studying the influence of preliminary magnetic treatment on the thermoplastic effect in aluminum alloys with ferromagnetic inclusions. The samples were exposed to a constant magnetic field with subsequent creep tests under uniaxial tension. Scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction analysis were used to analyze the alloy morphology. Specific heat and work of plastic deformation were calculated based on thermomechanical data. It was revealed that there is a relationship between magnetostriction, mechanical stresses at the matrix-inclusion boundary, and energy dissipation during deformation. It was found that preliminary magnetic exposure of samples increases the specific heat by 5 times (from 0.05 to 0.26 J/m³) and the work of deformation by 44 % (from 0.72 to 1.04 J/m³). The increase in the Taylor coefficient (from 0.07 to 0.25) and latent energy (from 0.67 to 0.78 J/m³) is associated with the redistribution of stresses at the matrix-inclusion boundary due to magnetostriction. When assessing the mechanical stresses caused by magnetostriction, the obtained values exceed the yield strength of the matrix, which explains the increase in energy dissipation. The results obtained can be used in the development of «smart» materials with programmable properties due to variations in the composition, size and concentration of the magnetoactive filler in the non-magnetic matrix.

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