In order to determine the synthesis conditions of α″-(Fe100-xCox)16N2, Fe-Co nitrided films were fabricated on MgO single-crystal substrates using reactive sputtering. The thermal stability of the α′Fe-Co phase was evaluated by measuring the temperature dependence of σs. It was found that: (1) for the as-deposited (Fe100-xCox)-N films, α′Fe-Co martensite phase with a stoichiometric N content of 11 at% can be formed up to x = 10, and with increasing x, α′Fe-Co phase with stoichiometric N content is not formed. (2) The phase decomposition temperature, Tpd, of α′-(Fe100-xCox)-N (x = 0-30) phase depends strongly on the Co and N contents of the α′Fe-Co phase. The Tpd of α′ phase decreases from 200°C (x = 0) to RT (x = 30) with increasing Co and N contents. (3) The formation at RT of stable α′-(Fe100-xCox)16N2 (x = 10-30) phase in the Fe-Co alloy system is concluded to be fairly difficult.
- Thermal stability
- α″-(FeCo)N* Reactive sputtering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics