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Fabrication of Zr- and Cu-base bulk metallic glass/Cu surface composites by high-energy electron-beam irradiation

Title
Fabrication of Zr- and Cu-base bulk metallic glass/Cu surface composites by high-energy electron-beam irradiation
Authors
Lee, KYun, ELee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
ELSEVIER SCIENCE SA
Abstract
Zr- and Cu-base bulk metallic glass (BMG)/Cu surface composites were fabricated by high-energy electron-beam irradiation in this study. The mixture of Zr- or Cu-base amorphous powders and LiF + MgF2 flux was deposited on a pure Cu substrate, and then electron beam was irradiated on this powder mixture to fabricate an 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 microstructural analysis results indicated that a number of soft, coarse, and Cu-rich crystalline phase particles were formed in the one-layered Zr-base BMG surface composite layer, whereas a small amount of hard and fine crystalline particles were homogeneously distributed in the amorphous matrix of the two-layered Zr-base BMG surface composite layer. On the other hand, the two-layered Cu-base BMG surface composite layer consisted of Cu-rich crystalline phases without amorphous phases because the cooling rate was not fast enough to form amorphous phases during the electron-beam irradiation, thereby indicating that amorphous forming ability was the most important factor in successfully fabricating BMG surface composites. The two-layered Zr-base BMG/Cu surface composite which fully took advantages of BMG alloys was successfully fabricated by the use of flux to shield protect oxidation environments, the second electron-beam irradiation to melt already-formed crystalline particles, and the fast heating and cooling rates to improve amorphous forming ability. (c) 2005 Elsevier B.V. All rights reserved.
Keywords
bulk metallic glass alloy; surface composite; crystalline phase particle; high-energy electron-beam irradiation; AMORPHOUS-ALLOYS; SUPERCOOLED LIQUID; CASTING METHOD; ZR41.2TI13.8CU12.5NI10.0BE22.5; MICROSTRUCTURE; BEHAVIOR; PHASES; STEEL
URI
http://oasis.postech.ac.kr/handle/2014.oak/29544
DOI
10.1016/J.MSEA.2005.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 408, no. 1-2, page. 92 - 101, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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