• Title/Summary/Keyword: Metallic glass

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Fabrication of Metallic Glass/metallic Glass Composites by Spark Plasma Sintering (방전플라즈마 소결법에 의한 비정질/비정질 복합재의 제조)

  • Lee, Jin-Kyu
    • Journal of Powder Materials
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    • v.14 no.6
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    • pp.405-409
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    • 2007
  • The Cu-based bulk metallic glass (BMG) composites containing Zr-based metallic glass phase have been consolidated by spark plasma sintering using the mixture of Cu-based and Zr-based metallic glass powders in their overlapped supercooled liquid region. The Zr-based metallic glass phases are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation process. The successful consolidation of BMG composites with dual amorphous phases was corresponding to the sound viscous flow of the two kinds of metallic glass powders in their overlapped supercooled liquid region.

Fabrication of Bulk Metallic Glass Composites by Mechanical Milling with Subsequent Spark Plasma Sintering Process (기계적 밀링 및 방전 플라즈마 소결 공정을 이용한 벌크 비정질 복합재의 제조)

  • Lee, Jin-Kyu;Kim, Taek-Soo;Kim, Jeong-Gon
    • Journal of Powder Materials
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    • v.14 no.3 s.62
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    • pp.197-201
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    • 2007
  • Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.

Synthesis of Ni-based Bulk Metallic Glass Composites (Ni계 벌크 비정질 복합재의 제조)

  • Lee, Jin-Kyu
    • Journal of Powder Materials
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    • v.15 no.4
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    • pp.297-301
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    • 2008
  • The Ni-based bulk metallic glass matrix composites were fabricated by spark plasma sintering of mixture of gas-atomized metallic glass powders and ductile brass powders. The successful consolidation of metallic glass matrix composite was achieved by strong bonding between metallic glass powders due to viscous flow deformation and lower stress of ductile brass powders in the supercooled liquid state during spark plasma sintering. The composite shows some macroscopic plasticity after yielding, which was obtained by introducing a ductile second brass phase in the Ni-based metallic glass matrix.

Properties of the metallic glass thin films fabricated by multicomponent single alloying target and its applications in various industrial fields

  • Shin, S.Y.;Moon, K.I.
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.05a
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    • pp.77-77
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    • 2015
  • Metallic glass alloys having dense packing structure have short range ordered structure with long range homogeneity. Therefore, they can provide complete corrosion protection and unique electrical properties. Recently, metallic glass thin films have received much attention to extend its application fields combining with PVC coating technologies. The metallic glass thin films can change the surface properties of the conventional bulk materials which need anticorrosion properties. However, multi-component alloying targets are required to fabricate the metallic glass thin films because metallic glass alloys contain more than three elements. Recently, many researchers have been reported the properties of the metallic glass thin films synthesized with multi-cathode systems or amorphous target. But, it is difficult to fabricate the large sized sputtering targets for mass production equipment with high toughness and thermal stability. In this study, newly developed sputtering target with glass forming ability and the properties of the metallic glass thin films will be introduced with respect to the various application fields such as bipolar plate in PEM fuel cell and decorative coatings for electric device and construction fields.

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Synthesis of Ni-based Metallic Glass Composite Fabricated by Spark Plasma Sintering (방전플라즈마소결을 이용한 Ni계 비정질 복합재의 제조)

  • Kim, Song Yi;Guem, Bo Kyeong;Lee, Min Ha;Kim, Bum Sung
    • Journal of Powder Materials
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    • v.20 no.1
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    • pp.33-36
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    • 2013
  • A bulk metallic glass-forming alloy, $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders was used for good commercial availability and good formability in supercooled liquid region. In this study, the Ni-based metallic glass was synthesized using by high pressure gas atomized metallic glass powders. In order to create a bulk metallic glass sample, the $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders with ball-milled Ni-based amorphous powder with 40%vol brass powder and Cu powder for 20 hours. The composite specimens were prepared by Spark Plasma Sintering for the precursor. The SPS was performed at supercooled liquid region of Ni-based metallic glass. The amorphous structure of the final sample was characterized by SEM, X-ray diffraction and DSC analysis.

Consolidation and Characterization of Cu-based Bulk Metallic Glass Composites (Cu기 벌크 비정질 복합체의 성형 및 특성)

  • Lee, Jin-Kyu;Kim, Taek-Soo
    • Journal of Powder Materials
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    • v.14 no.6
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    • pp.399-404
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    • 2007
  • The Cu-based bulk metallic glass (BMG) composite was fabricated by spark plasma sintering (SPS) using of gas-atomized metallic glass powders and ductile brass powders. No defect such as pores and cavities was observed at the interface between the brass powder and the metallic glass matrix, suggesting that the SPS process caused a severe viscous flow of the metallic glass and brass phases in the supercooled liquid region, resulting in a full densification. The BMG composites shows some macroscopic plasticity after yielding, although the levels of strength decreased.

Consolidation of Bulk Metallic Glass Composites

  • Lee, Jin-Kyu;Kim, Hwi-Jun;Kim, Taek-Soo;Shin, Seung-Yong;Bae, Jung-Chan
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.848-849
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    • 2006
  • Bulk metallic glass (BMG) composites combining a $Cu_{54}Ni_6Zr_{22}Ti_{18}$ matrix with brass powders or $Zr_{62}A_{l8}Ni_{13}Cu_{17}$ metallic glass powders were fabricated by spark plasma sintering. The brass powders and Zr-based metallic glass powders added for the enhancement of plasticity are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation. The BMG composites show macroscopic plasticity after yielding, and the plastic strain increased to around 2% without a decrease in strength for the composite material containing 20 vol% Zr-based amorphous powders. The proper combination of strength and plasticity in the BMG composites was obtained by introducing a second phase in the metallic glass matrix.

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Development of nano/micro forming and evaluation technology of Zr-base bulk metallic glass (Zr계 벌크 비정질 합금의 미세성형 및 평가기술 개발)

  • Ok M.-R.;Suh J. Y.;Chung S. J.;Hong K. T.;Ji Y. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.44-47
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    • 2004
  • Although bulk metallic glasses have many outstanding aspects in their chemical, mechanical or functional properties, some critical problems still hinder their wide application. The most important one is the brittle nature of them, which is the serious problem to structural application. So, to use viscous flow is now the only competent way to form bulk metallic glass. In this study, we investigated the basic nature of viscous flow of Zr-base bulk metallic glass, vitrelloy 1, in terms of process variables. The results were used to design the thermo-mechanical process composed of heating, holding, pressing, and cooling, which have unique influence on the glass transition and crystallization behavior. We adopted small load scale and dies with nano/micro patterns on them. The results were evaluated using several analytical methods.

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Characterization of the Oxide Layer Formed on the Cu-Zr Based Metallic Glass during Continuous Heating

  • Lim, Ka-Ram;Kim, Won-Tae;Kim, Do-Hyang
    • Applied Microscopy
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    • v.42 no.3
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    • pp.174-178
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    • 2012
  • In the present study, the oxidation behavior of $Cu_{50}Zr_{50}$ and $Cu_{46}Zr_{46}Al_8$ metallic glasses has been investigated using transmission electron microscopy with a particular attention on the oxidation behavior in the supercooled liquid state. Identification of the oxidation product after continuous heating treatment shows that in $Cu_{50}Zr_{50}$ metallic glass, $ZrO_2$ with the monoclinic structure forms on the supercooled liquid as well as on the crystallized matrix. On the contrary, in $Cu_{46}Zr_{46}Al_8$ metallic glass, $ZrO_2$ with the tetragonal structure forms on the supercooled liquid, but that with the monoclinic structure forms on the crystallized matrix. The result indicates that the $Cu_{50}Zr_{50}$ metallic glass exhibits far better oxidation resistance in the supercooled liquid state than the $Cu_{46}Zr_{46}Al_8$ metallic glass.

Synthesis of Al-Ni-Co-Y Bulk Metallic Glass fabricated by Spark Plasma Sintering (방전 플라즈마 소결법을 이용한 Al-Ni-Co-Y 벌크 비정질 합금의 제조)

  • Jeong Pyo Lee;Jin Kyu Lee
    • Journal of Powder Materials
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    • v.30 no.1
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    • pp.41-46
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    • 2023
  • In this study, an Al82Ni7Co3Y8 (at%) bulk metallic glass is fabricated using gas-atomized Al82Ni7Co3Y8 metallic glass powder and subsequent spark plasma sintering (SPS). The effect of powder size on the consolidation of bulk metallic glass is considered by dividing it into 5 ㎛ or less and 20-45 ㎛. The sintered Al82Ni7Co3Y8 bulk metallic glasses exhibit crystallization behavior and crystallization enthalpy similar to those of the Al82Ni7Co3Y8 powder with 5 ㎛ or less and it is confirmed that no crystallization occurred during the sintering process. From these results, we conclude that the Z-position-controlled spark plasma sintering process, using superplastic deformation by viscous flow in the supercooled liquid-phase region of amorphous powder, is an effective process for manufacturing bulk metallic glass.