|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||F-32: Study on the Lamellar Boundary Orientation of Ti-46Al-8Nb Alloy with Various Growth Rate
||Jongmoon Park, Ho Seung Jang, Seongwoong Kim, Seungeon Kim, Younghwan Hong, Myunghoon Oh
|On-Site Speaker (Planned)
In this study, phase transformation phenomena at the high-temperature field were investigated by using designed ternary Ti-Al-Nb alloy. Examination of dendritic morphologies in arc-melted button ingot could reveal the crystallography of the primary solidification phase. The pseudo-ternary phase diagram of Ti-Al-Nb system was constructed by DTA. On the basis of the pseudo phase diagram completed in the study, the Ti-46Al-8Nb(at%) alloy, which was directionally solidified by using a floating zone type DS apparatus at the various growth rate. It has been found that the lamellar orientation was aligned nearly 0 or 45 degrees to the growth direction. However, when the directional solidification was performed at a growth rate of 90mm/h, the lamellar boundary orientation of DS ingot was nearly perpendicular to the growth direction. These results mean that lamellar boundary orientation of DS ingot has been affected by the growth rate as well as composition.
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