Application of combined load for obtaining ultra-fine grained structure in magnetic alloys of the Fe-Cr-Co system
DOI:
https://doi.org/10.31181/rme200101001kKeywords:
Magnetic properties, mechanical properties, ternary systems, severe plastic deformation, gradient structuresAbstract
Fe-Cr-Co system magnets are known for their high remanence and maximum energy product along with high mechanical properties. However, since the thermomagnetic treatment of the alloy implies the spinodal decomposition, which in turn drops the ductility of the material, finding a balance of magnetic and mechanical properties is in focus of many scientist due to its relevance. One of possible paths for finding this balance is application of hot deformation approach. The processes of dynamic recrystallization during hot deformation by means of compression accompanied torsion of magnetic alloys Fe-25%Cr-15%Co and Fe-30%Cr-8%Co of Fe-Cr-Co ternary system were studied. It is shown that the chosen method of deformation can be effectively applied to receive ultrafine-grained structure in the vicinity of the deformation zones and obtaining the gradient type structure in considered alloys. Founding on the analysis of results obtained, basic principles for enhancement of the alloy properties during thermomechanical treatment were figured out. Specific values of strain temperature and velocity for both considered alloys were proposed.
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