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RISS 인기검색어
- 검색키워드
- 저자 : 최근섭 ( Keun Seob Choi ) (검색결과 3 건)
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최근섭,김도향,홍경태,Choi, Keun-Seob,Kim, Do-Hyang,Hong, Kyung-Tae 한국현미경학회 1997 Applied microscopy Vol.27 No.4
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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홍경태,최근섭,김도경 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.10
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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홍경태,김도향,최근섭 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.5
Formation and thermal decomposition behavior of nanocrystalline structure in NiTi intermetallics have been investigated by a combination of X-ray diffraction analysis, scanning/transmission electron microscopy, differential scanning calorimetry. Mechanically alloyed Ni_(50)Ti_(50) consist of 5-15 ㎚ size grains with a disordered b.c.c. structure and decomposes by eutectoid reaction into Ni₃Ti and NiTi₂ forming an endothermic peak at the temperature range of 450℃-550℃ Such a low-temperature eutectoid reaction is attributable to the ㎚-scale structure with a large amount of defects accumulated during mechanical alloying process. The occurrence of these transformation is closely related to the unique features of the microstructure in the mechanically alloyed powders.
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