| Title |
Microstructural Study of Two-Layered Amorphous Alloy Surface Composites Fabricated by High-Energy Electron-Beam Irradiation |
| Authors |
이규홍(Kyu Hong Lee); 윤은섭(Eun Sub Yun); 이성학(Sung Hak Lee); 김낙준(Nack J. Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Two-layered surface composites; Electron beam irradiation; Amorphous alloy; Crystalline phase |
| 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. |