Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Room and High Temperature Deformation Behaviors and Estimation on Formability of Zr-based Bulk Metallic Glass Composite

Zr-Nb-Cu-Ni-Al 비정질 복합 재료의 변형거동과 성형성

  • Jun, H.J. ;
  • Lee, K.S. ;
  • Kuhn, U. ;
  • Eckert, J. ;
  • Chang, Y.W.
  • 전현준 (포항공과대학교 신소재공학과) ;
  • 이광석 (한국기계연구원부설 재료연구소 융합공정연구부) ;
  • ;
  • ;
  • 장영원 (포항공과대학교 신소재공학과)
  • Published : 2008.10.09
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Abstract

In this study, we investigated the thermal properties of $Zr_{66.4}Nb_{6.4}Cu_{10.5}Ni_{8.7}Al_{8.0}$ by using a differential scanning calorimeter (DSC), and then analyzed the composition of dendrite phase by using X-ray diffraction (XRD). A series of uniaxial compression tests has been performed under the strain rates between $10^{-5}/s$ and $10^{-2}/s$ at room temperature and near SLR. This BMGC has higher high temperature strength than other Zr-based monolithic BMGs because in-situ formed crystalline phases hinder a feasible viscous flow of amorphous matrix. Warm formability is also estimated by laboratory-scale extrusion test within supercooled liquid region. It was found that BMGC has poor formability compared with nother Zr-based bulk metallic glass composite presumably due to large volume fraction of 'brittle' crystalline phases distributed within amorphous matrix.

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