Mechanical Alloying에 의한 비정질 Ti40Cu40Ni10Al10 합금의 형성 및 열적특성
Formation and Thermal Properties of Amorphous Ti40Cu40Ni10Al10 Alloy by Mechanical Alloying
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The amorphization process and the thermal properties of amorphous Ti40Cu40Ni10Al10 powder during milling by mechanical alloying were examined by X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The chemical composition of the samples was examined by an energy dispersive X-ray spectrometry (EDX) facility attached to the scanning electron microscope (SEM). The as-milled powders showed a broad peak (2θ = 42.4o) with crystalline size of about 5.0 ㎚ in the XRD patterns. The entire milling process could be divided into three different stages: agglomeration (0<tm ≤ 3 h), disintegration (3 h < tm ≤ 20 h), and homogenization (20 h < tm ≤ 40 h) (tm: milling time). In the DSC experiment, the peak temperature Tp and crystallization temperature Tx were 466.9℃ and 444.3℃, respectively, and the values of Tp, and Tx increased with a heating rate (HR). The activation energies of crystallization for the as-milled powder was 291.5 kJ/㏖ for Tp.
Abstract
The amorphization process and the thermal properties of amorphous Ti40Cu40Ni10Al10 powder during milling by mechanical alloying were examined by X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The chemical composition of the samples was examined by an energy dispersive X-ray spectrometry (EDX) facility attached to the scanning electron microscope (SEM). The as-milled powders showed a broad peak (2θ = 42.4o) with crystalline size of about 5.0 ㎚ in the XRD patterns. The entire milling process could be divided into three different stages: agglomeration (0<tm ≤ 3 h), disintegration (3 h < tm ≤ 20 h), and homogenization (20 h < tm ≤ 40 h) (tm: milling time). In the DSC experiment, the peak temperature Tp and crystallization temperature Tx were 466.9℃ and 444.3℃, respectively, and the values of Tp, and Tx increased with a heating rate (HR). The activation energies of crystallization for the as-milled powder was 291.5 kJ/㏖ for Tp.
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