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A Study on the Synthesis and Consolidation of Ti3Al by Electro-Discharge  

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)
Publication Information
Korean Journal of Metals and Materials / v.47, no.8, 2009 , pp. 488-493 More about this Journal
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
$Ti_3Al$; intermetallic compound; electro-discharge-sintering; phase transformation;
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