Abstract
The thermal stability of two-phase (α + γ) lamellar microstructure in Ti-Al-Mo PST (polysynthetically twinned that has single colony) crystals, containing C or Si, was investigated. In addition, the variation of α-phase volume fraction in Ti-Al-Mo-(C,Si) systems was investigated at several temperatures. Ti-46Al-1.5Mo-0.2C and Ti-46Al-1.5Mo-1.0Si alloys did not recrystallized (‘stable’ in this paper) during heat treatments at various heating rates and temperatures. Moreover, the α-phase volume fractions of Ti-46Al-1.5Mo-0.2C and Ti-46Al-1.5Mo-1.0Si alloys which were stable compositions, changed less than those of Ti-47Al and Ti-46Al-1.5Mo alloys which were unstable compositions. The instability of the latter alloys was caused by their relatively higher variation of α-phase volume fraction during heating. Therefore, it is suggested that the variation of α-phase volume fraction is an important factor in controlling the thermal stability of lamellar microstructure.
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Kim, S.W., Lee, H.N., Oh, M.H. et al. Effects of the variation in α-phase volume fraction on the thermal stability of TiAl alloys with a lamellar microstructure. Journal of Materials Science 39, 6929–6935 (2004). https://doi.org/10.1023/B:JMSC.0000047534.33875.01
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DOI: https://doi.org/10.1023/B:JMSC.0000047534.33875.01