발간논문

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Vol.19, No.1, 49 ~ 57, 1981
Title
A Study on the Crystallization Kinetics of Amorphous Co79 - B21 Alloy
조성석Seong Seock Cho, 김윤배Yoon Bai Kim, 김택기Taik Kee Kim, 홍종휘Jong Hwi Hong
Abstract
The phase transformation of amorphous Co_79B_21 alloy prepared by the roller quenching method was studied by DTA, electrical resistivity measurements and X-ray diffraction. The crystallization fraction was deduced from electrical resistivity. The amorphous forming range of Co_(100-x)B_x system was found to be 19≤×≤27 (at％). The first transformation of amorphous Co_79B_21 occured at 420℃ and was exothermic reaction. The transformation from the amorphous state to β-Co (fcc, a=3.54Å) was controlled by diffusion growth. The activation energy for crystallization was 50 Kcal/mole for the isothermal annealing of amorphous Co_(79)B_(21) alloy.
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