발간논문

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Vol.38, No.8, 1047 ~ 1053, 2000
Title
Characterization of TiAl Alloy Including β-Stabilizer 2. Directional Solidification and Mechanical Properties
정인수In Soo Jung,장홍섭Hong Seob Jang,오명훈Myung Hoon Oh,위당문Dang Moon Wee
Abstract
The lamellar orientation of TiAl/Ti₃Al two phase alloy containing W was controlled to align at 0° and 45° to the growth direction by directional solidification (DS). The composition of β solidification in Ti-Al-W ternary system could be determined from the partial liquidus projection which was constructed by observing the microstructure of arc-melted buttons. The Ti-47Al-2W composition was selected for β solidification and the directional solidification was performed by using a Bridgman-type DS apparatus at the growth rate of 90 ㎜/hr. At the beginning part of the as-grown DS ingot, the columnar grains with the lamellar orientation at an angle of 0° (A orientation) and 45° (B orientation) to the growth direction were both observed, but the grains with A orientation disappeared increasingly. Finally, the columnar grains with B orientation coalesced to whole DS ingot. In the results of room temperature tensile test, Ti-47Al-2W DS alloy exhibited superior tensile elongation to the polycrystalline alloy having the same composition.
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