Iron-Cobalt (Fe-Co) Phase Diagram
Figure 1 shows the iron-cobalt phase diagram calculated with Thermo-Calc, coupled with PBIN thermodynamic database.
According to the Fe-Co phase diagram, the melting point of iron and cobalt at the pressure of 101325 Pa is 1538 °C and 1495 °C, respectively.
Figure 1. Fe-Co phase diagram shows which phases are to be expected at equilibrium for different combinations of cobalt content and temperature. The Fe-Co phase diagram was calculated with Thermo-Calc, coupled with PBIN thermodynamic database.
In the Fe-Co system, at approximately 50 at. % Co and below 1000 K, the random BCC A2 alpha phase transforms into the ordered simple cubic B2 structure (not shown in Figure 1) of identical overall composition, where the iron atoms arrange themselves preferentially to the cube corners and the cobalt atoms to the cube centers. This second-order transformation involves a relatively small amount of energy.
Ordering into the cubic B2 structure is accompanied by an increase in hardness compared to the disordered (random) BCC A2 alpha phase.
• The phase diagram of Iron-Cobalt binary system
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