|
KMID : 0381919970270040473
|
|
Korean Journal of Microscopy
1997 Volume.27 No. 4 p.473 ~ p.481
|
|
|
Diffraction Characteristics of Mechanically Alloyed Nanocrystalline FeAl
|
|
Choi Keun-Seob
Kim Do-Hyang
Hong Kyung-Tae
|
|
|
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.
|
|
|
KEYWORD
|
|
|
Mechanical alloying, Nanocrystalline, Nano-scale ordering
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|