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Vol.28, No.2, 170 ~ 179, 1990

Title

Effects of Alloying Elements on the thermal Stability of rapidly solidified Al - Fe Based alloys

백남익Nam Ik Baik, 허성강Sung Kang Hur, 나형용Hyung Yong Ra

Abstract

The effects of alloying elements on the thermal stability of rapidly solidified Al-Fe based alloys have been studied. Various specimens which were heattreated in the temperature range of 200-550℃ for one hour were observed by optical and transmission electron microscopes. Lattice parameter change and precipitated phases were investigated by X-ray diffraction. Zone A region decreased in the specimen temperature at 300℃, 450℃ and 500℃ for the Al-Fe, for the Al-Fe-Mo and Al-Fe-Si, and for the Al-Fe-Mo-Si respectively. After one hour annealing at 550℃, second phases were precipitated in the zone B ; they were identified as Al₃Fe for the Al-Fe and Al-Fe-Mo and as Al₃Fe and Silicide for the Al-Fe-Si and Al-Fe-Mo-Si. Precipitates in the Al-Fe-Mo-Si were fine and spherical shape. The hardness of Al-Fe-Mo-Si alloys is higher than that of the other Al-Fe based alloys. The change of the lattice parameter was not observed from all the specimens annealed at 550℃ for one hour.

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