Influence of Plastic Deformation on the Microstructure, Mechanical and Magnetic Properties of Multicomponent Alloys of the System CoCrFeNiAlx

The article presents the results of the effect of plastic deformation by rolling on the microstructure, phase composition, mechanical and magnetic properties of multicomponent CoCrFeNiAl_0.8 and CoCrFeNiAl_1.0 alloys with different ratios of bcc and fcc phases. Microstructural analysis using EBSD showed that plastic deformation leads to an increase in the dislocation density, structure refinement, and the formation of predominantly deformed grains. An increase in the bcc phase content in the CoCrFeNiAl_1.0 alloy leads to a 20% increase in hardness compared to the CoCrFeNiAl_0.8 alloy. The strength properties of CoCrFeNiAl_0.8 samples increase by 7%) after deformation. The phase morphology had a significant effect on the coercive force in the initial state, where the presence of eutectic colonies contributes to an increase in the number of interphase boundaries and hinders magnetization reversal processes. Homogenization leads to a decrease in coercivity and magnetization at the maximum applied field; this is associated with the relaxation of internal stresses and the redistribution of chemical composition, respectively. Plastic deformation (10 and 20%) leads to a considerable increase in coercivity; this is due to changes in microstructural parameters such as grain size, dislocation density, and the number of low-angle boundaries.