발간논문

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Vol.35, No.10, 1263 ~ 1271, 1997
Title
Ordering behavior of Nanocrystalline FeAl
최근섭 , 김도경 , 홍경태 Keun Seob Choi , Do Hyang Kim , Kyung Tae Hong
Abstract
Formation and disorder-order transformation of nanocrystalline FeAl have been investigated by a combination of scanning/transmission electron microscopy, X-ray diffraction analysis, differential scanning calorimetry and saturated magnetization measurement. Fe-50at% Al powders mechanically alloyed for 90 hours consist of 5-10㎚ size grains with a disordered b.c.c. structure. Lattice parameter of FeAl increases with mechanical alloying time not only due to solutionizing of Al into Fe, but also due to increasing of internal defects. X-ray diffraction, TEM analysis and magnetization values of nanocrystalline FeAl show that disorder-order transformation occurs at the temperature range of 300℃-320℃. Such a low-temperature ordering behavior is attributable to the ㎚-scale structure with a large amount of defects accumulated during mechanical alloying process. Present study shows that saturated magenization value is a good indicator of the ordering process.
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