Diffraction characteristics of mechanically alloyed nanocrystalline FeAl
- Diffraction characteristics of mechanically alloyed nanocrystalline FeAl
- 최근섭; 김도향; 홍경태
- FeAl; Mechanical alloying; Nanocrystalline; Nano-scale ordering
- Issue Date
- VOL 27, NO 4, 473-481
- Disorder-order transformation of nanocrystalline FeAl have been investigated by a combination of electron and X-ray diffraction analysis including high resolution electron microscopy and differential scanning calorimetry. Fe-50at.%Al powders mechanically alloyed for 90 hours consist of nm size grains haying either disordered b.c.c. structure or amorphous structure. X-ray and electron diffraction of mechanically alloyed FeAl powders show that disorder-order transformation occurs at the temperature range of . Such a low-temperature ordering behavior exhibiting an exothermic reaction is attributable to the nm-scale grain structure with a large amount of defects accumulated during mechanical alloying process.
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