기계적 합금화하여 제조한 Fe-5Y2O3 합금분말의 나노산화물 석출거동

Abstract

A precipitation behavior of nano-oxide particle in Fe-5Y2O3 alloy powders is studied. The mechanicallyalloyed Fe-5Y2O3 powders are pressed at 750oC for 1h, 850oC for 1h and 1150oC for 1h, respectively. The results of Xraydiffraction pattern analysis indicate that the Y2O3 diffraction peak disappear after mechanically alloying process, butY2O3 and YFe2O4 complex oxide precipitates peak are observed in the powders pressed at 1150oC. The differentialscanning calorimetry study results reveal that the formation of precipitates occur at around 1054oC. Based on the transmissionelectron microscopy analysis result, the oxide particles with a composition of Y-Fe-O are found in the Fe-5Y2O3alloy powders pressed at 1150oC. It is thus conclude that the mechanically alloyed Fe-5Y2O3 powders have no precipitatesand the oxide particles in the powders are formed by a high temperature heat-treatment.