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Vol.40, No.6, 646 ~ 655, 2002
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| Title |
| Research Papers / Solidification : Effects of the Variation in α-Phase Volume Fraction Thermal Stability of TiAl Alloys with a Lamellar Microstructure |
| 오명훈Myung Hoon Oh,위당문Dang Moon Wee,김성웅Seong Woong Kim,이호년Ho Nyun Lee,산구정치Masaharu Yamaguchi |
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| Abstract |
| The thermal stability of lamellar microstructure in TiAl-Mo PST crystals containing C or Si was investigated. In addition, the variation of α-phase volume fraction in Ti-Al-Mo-(C, Si) systems was also investigated at several temperatures. It was found that Ti-46Al-1.5Mo-O.2C and Ti-46Al-1.5Mo-1.0Si alloys were very stable during heat treatments at various heating rates and temperatures. Moreover, the, α-phase volume fraction of Ti-46A1-1.5Mo-0.2C and Ti-46A1-1.5Mo-1.OSi alloys (stable composition) was less changed than those of Ti-47Al and Ti-46Al-1.5Mo alloys (unstable composition). From these results, the instability of the latter alloys was thought to be resulted from relatively higher variation of α-phase volume fraction during heating. Therefore, it could be suggested that the variation of α-phase volume fraction is an important factor that control the thermal stability of lamellar microstructure. |
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