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자료유형
학술저널
저자정보
H. S. Jang (Sejong University) C. J. Van Tyne (Colorado School of Mines) W. H. Lee (Sejong University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4
발행연도
2019.1
수록면
991 - 999 (9page)

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Elemental Ti and Al powders were milled and mixed as starting materials for the synthesis of titanium aluminide solid compactsby using the electric discharge sintering (EDS) technique. The polycrystalline compact with near full-density (> 99.6%)and the main phase of Ti 3 Al was produced in 170 μs by the EDS. In the early stage of electric discharging, the generated heatat the interface of metal and oxide fi lm created an explosive force, inducing a dielectric breakdown of inherent oxide fi lm. Once the oxide fi lm was removed and the metals were melt, the formation of necks at the clean contact points occurred andthe inter-diff usion between Ti and Al in liquid phase was initiated at the metallic contact areas with sequent alloying intoan amorphous Ti 3 Al. During the full alloying and substantial neck growth, the heat dissipated through the mold, causingthe crystallization of Ti 3 Al. During the EDS, pinch pressure (24–68 MPa) was also generated, which can densify the EDScompact. The fi ne microstructure, higher density, and greater hardness of EDS compact were results of the shorter exposuretime to a high temperature and the generated pinch pressure, causing a higher densifi cation and constrained grain growth,compared to conventional powder metallurgy methods.

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