Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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A Study on the Synthesis and Consolidation of Ti3Al by Electro-Discharge

전기방전에 의한 Ti3Al의 합성 및 소결 특성 연구

  • Jang, Hyungsun (Department of Advanced Materials Engineering, Sejong University) ;
  • Cho, Yujung (Department of Advanced Materials Engineering, Sejong University) ;
  • Kang, Taeju (Department of Advanced Materials Engineering, Sejong University) ;
  • Kim, Kibeom (Department of Advanced Materials Engineering, Sejong University) ;
  • Lee, Wonhee (Department of Advanced Materials Engineering, Sejong University)
  • 장형순 (세종대학교 신소재공학과) ;
  • 조유정 (세종대학교 신소재공학과) ;
  • 강태주 (세종대학교 신소재공학과) ;
  • 김기범 (세종대학교 신소재공학과) ;
  • 이원희 (세종대학교 신소재공학과)
  • Received : 2009.01.15
  • Published : 2009.08.25
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Abstract

Direct syntheses of bulk $Ti_3Al$ via electro-discharge-sintering (EDS) of a stoichiometric elemental powder mixture were investigated. A capacitor bank of $450{\mu}F$ was charged with three input energies, 0.5, 1.0, and 1.5 kJ. The charged capacitor bank was then instantaneously discharged through 0.3 g of a Ti-25.0 at.%Al powder mixture for consolidation. Complete phase transformation occurred in less than $200{\mu}sec$ by the discharge and a bulk $Ti_3Al$ compact was obtained. Compared with consolidated samples fabricated by conventional methods such as high vacuum sintering and casting, the electro-discharge-sintered $Ti_3Al$ compact shows a very fine microstructure with a hardness value of 425 Hv. Electro-discharge-sintering under a $N_2$ atmosphere successfully modified the surface Ti oxide of the $Ti_3Al$ compact into Ti nitride, which concurred with the synthesis and consolidation of $Ti_3Al$. Complete conversion yielding a single phase $Ti_3Al$ is primarily dominated by the fast solid state diffusion reaction.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단

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