Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Diffraction Characteristics of Mechanically Alloyed Nanocrystalline FeAl

기계적합금화한 FeAl 나노결정립의 회절특성

  • Choi, Keun-Seob (Dept. of Metallurgical Eng., Yonsei University (Jointly Appointed at the Center lot Advanced Aerospace Materials)) ;
  • Kim, Do-Hyang (Dept. of Metallurgical Eng., Yonsei University (Jointly Appointed at the Center lot Advanced Aerospace Materials)) ;
  • Hong, Kyung-Tae (Division of Metals, Korea Institude of Science and Technology)
  • 최근섭 (연세대학교 공과대학 금속공학과(항공재료연구센터)) ;
  • 김도향 (연세대학교 공과대학 금속공학과(항공재료연구센터)) ;
  • 홍경태 (한국과학기술연구원 금속연구부)
  • Published : 1997.12.01
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Abstract

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 $5\sim10$ 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 $300^{\circ}C\sim320^{\circ}C$. 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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