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Vol.42, No.9, 725 ~ 732, 2004
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| Title |
| Microstructural Study of Two-Layered Amorphous Alloy Surface Composites Fabricated by High-Energy Electron-Beam Irradiation |
| 이규홍 Kyu Hong Lee , 윤은섭 Eun Sub Yun , 이성학 Sung Hak Lee , 김낙준 Nack J. Kim |
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| Abstract |
| This study is concerned with the fabrication of two-layered amorphous/Cu surface composites by high-energy electron-beam irradiation. The mixture of Zr-base amorphous powders and LiF＋MgF₂ flux was deposited on a pure Cu substrate, and then electron beam was irradiated on these powder mixture to fabricate a one-layered surface composite. A two-layered surface composite was also fabricated by irradiating electron beam again onto the powder mixture deposited on the one-layered surface composite. The composite layers of 1.6~1.7 mm in thickness were homogeneously formed without defects, and the two-layered composite contained a few fine crystalline phase particles in the amorphous matrix. This fabrication could be achieved by (1) the use of flux which protected the oxidation environments, (2) the second electron-beam irradiation which melted already-formed crystalline particles, and (3) the fast cooling rate of the irradiation method which provided the high amorphous forming ability. Such a development of the fabrication technique of amorphous alloy surface composites presented new applicability of amorphous alloys to structures and components requiring excellent mechanical properties. |
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| Key Words |
| Two-layered surface composites, Electron beam irradiation, Amorphous alloy, Crystalline phase |
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