Fe-5Y2O3 조성의 기계적 합금화 분말에 형성된 산화물의 상변태 거동

Abstract

The phase transformation behavior of the oxides formed in mechanically alloyed Fe-5Y(2)O(3) powder is investigated. Non-stoichiometric Y-rich and Fe-rich oxides with sizes of less than 300 nm are observed in the mechanically alloyed powder. The diffusion and redistribution reactions of the elements in these oxides during heating of the powder above 800 degrees C were observed, and these reactions result in the formation of a Y3Fe5O12 phase after heating at 1050 degrees C. Thus, it is considered that the Y2O3 powder and some Fe powder are formed from the non-stoichiometric Y-rich and Fe-rich oxides after the mechanical alloying process, and a considerable energy accumulated during the mechanical alloying process leads to a phase transformation of the Y-rich and Fe-rich oxides to Y alpha Fe beta O gamma-type phase during heating.