| 초록 |
A precipitation behavior of nano-oxide particle in Fe- $5Y_2O_3$ alloy powders is studied. The mechanically alloyed Fe- $5Y_2O_3$ powders are pressed at $750^{ circ}C$ for 1h, $850^{ circ}C$ for 1h and $1150^{ circ}C$ for 1h, respectively. The results of Xray diffraction pattern analysis indicate that the $Y_2O_3$ diffraction peak disappear after mechanically alloying process, but $Y_2O_3$ and $YFe_2O_4$ complex oxide precipitates peak are observed in the powders pressed at $1150^{ circ}C$ . The differential scanning calorimetry study results reveal that the formation of precipitates occur at around $1054^{ circ}C$ . Based on the transmission electron microscopy analysis result, the oxide particles with a composition of Y-Fe-O are found in the Fe- $5Y_2O_3$ alloy powders pressed at 1150oC. It is thus conclude that the mechanically alloyed Fe- $5Y_2O_3$ powders have no precipitates and the oxide particles in the powders are formed by a high temperature heat-treatment. |
