Abstract
The hardness of forged iron-cobalt alloys which were annealed and quenched, has been measured by Rockwell hardness tester in B-scale.The hardness value of the alloys in the FeCo superlattice range from 40 to 60% of cobalt changes due to the order-disorder transformation. The hardness value in B-scale of 51.5% cobalt alloy (FeCo) is 91 in the quenched state, while 76.5 in the slow-cooled state ; the change of hardness value being about 19%. The hardness changes remarkably between 650° and the transformation temperature (732°).
