| Title |
Research Papers / Solidification : Effects of the Variation in α-Phase Volume Fraction Thermal Stability of TiAl Alloys with a Lamellar Microstructure |
| Authors |
오명훈(Myung Hoon Oh),위당문(Dang Moon Wee),김성웅(Seong Woong Kim),이호년(Ho Nyun Lee),산구정치(Masaharu Yamaguchi) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| 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. |