LOW-TEMPERATURE TREATMENT OF A COBALT-BASED AMORPHOUS SOFT-MAGNETIC ALLOY

The effect of treatment at temperature of liquid nitrogen (-196 degree s C) for 10, 60, and 120 min on chemical composition of the surface la vers and properties of the soft magnetic amorphous Co57Ni10Fe5Si11B17 alloy was studied. The low-temperature treatment causes the enrichment of surface with nonmetal atoms, The most abrupt change was observed a fter treatment for 30 min. Supposedly, these processes are caused by t he temperature wave initiating a compression wave leading to the struc tural transformations. The latter are similar to the structural relaxa tion occurring in the range below the crystallization temperature, Thi s treatment increases the corrosion resistance and strength of the all oy with the retention of coercive force.