|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Ordered ω Phase Transformations in High Nb-TiAl Alloys
||Lin Song, Junpin Lin, Jinshan Li, Hongchao Kou
|On-Site Speaker (Planned)
In this study, the phase transformation behaviors of ordered ω phases in high Nb-TiAl alloys at 800~950℃ are reported. The ordered ω phases were removed at 950℃ while some ωo particles remained within βo areas after annealing at 900℃. However, in Ti-45Al-8.5Nb-0.2B alloy, the ωo phase could consume the whole βo areas after annealing at 850℃. The ωo phase also emerged in Ti-45Al-(6~10)Nb alloys after annealing at 850℃, which precipitated within α2 phase. Thus it can be concluded that the ordered ω phases are inevitable in the service condition of TiAl alloys. However, the direct evaluation of their effects on the mechanical properties is difficult because of their low volume fraction and distribution. Trace addition of other alloying elements will effectively control the morphology and stable temperatures of ordered ω phases, which may inspire new ideas on better controlling of these phase and optimizing microstructures.
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