Partial substitution of Co and Ge for Fe and B in Fe-Zr-B-Cu alloys: microstructure and soft magnetic applicability at high temperature

摘要

The partial substitutions of Co for Fe and Ge for B are studied for a Fe83-xCoxZr6B10-yGeyCu1alloy series (x = 0, 5 and 20; y = 0 and 5) as a possible way to enhance the high temperatureapplicability of NANOPERM alloys. The devitrification process, the nanocrystallizationkinetics and the nanocrystalline microstructure are similar for all the studied alloys. Good softmagnetic properties are observed even at a high crystalline volume fraction of bcc -Fenanocrystals, which are stable up to ~1000 K. The partial substitution of Co for Fe is veryeffective to increase the Curie temperature of the residual amorphous matrix (TCAM). Althoughthe substitution of Ge for B is ineffective to increase TCAM, a clear increase of the saturationmagnetization with respect to the Ge-free alloy can be observed