발간논문

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Vol.36, No.5, 631 ~ 640, 1998
Title
Thermal decomposition behavior of nanocrystalline NiTi
최근섭 , 김도향 , 홍경태 Keun Seob Choi , Do Hyang Kim , Kyung Tae Hong
Abstract
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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