발간논문

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Vol.30, No.5, 539 ~ 547, 1992
Title
Temperature Dependence of mechanical Properties of Cast TiAl Intermetallic Compounds
최창우Chang Woo Choi, 조원석Won Suk Cho, 홍준표Chun Pyo Hong
Abstract
TiAl intermetallic compound has the potential for high-temperature structural applications because of its positive temperature dependence of strength. In this study, the temperature dependence of cast TiAl intermetallic compound was investigated. The specimens of TiAl intermetallic compound were tasted by vaccuum induction melting system using calcia crucible. Compression test was carried out from room temperature to 1000℃. The positive temperature dependence of strength was not observed in the cast TiAl intermetallic compound. The ductile-brittle transition was occured at about 700℃. Strength of Ti-48at%Al alloy at room temperature was higher than that of Ti-50at%Al alloy, but the difference of strength between the two alloys was decreased with the increase of testing temperatures. The deformation structure at 800℃ consists of twins and cell structure of dislocation by cross-slip.
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