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Metals 2017, 7(6), 192;

Precipitation Behavior of ωo Phase in Ti-37.5Al-12.5Nb Alloy

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
Authors to whom correspondence should be addressed.
Academic Editor: Tilmann Beck
Received: 27 April 2017 / Revised: 18 May 2017 / Accepted: 19 May 2017 / Published: 26 May 2017
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Mutual transformation between α2 and ωo phases has been an interesting topic in recent years. In this study, martensitic α2 was obtained by air-cooling from 1250 °C in Ti-37.5Al-12.5Nb (at%) alloy while four ωo variants formed in the βo phase matrix during the cooling process. Nonetheless, only one ωo variant was observed at the periphery of the α2 plates in the βo phase and the orientation relationship between these two phases was [0001] α2//[ 1 2 ¯ 10 ] ωo; ( 11 2 ¯ 0 ) α2//(0002) ωo. Thin γ plates precipitated within the α2 phase and were thought to be related to the appearance of ωo phase. The redistribution of the compositions during the phase transformations was studied by energy dispersive X-ray spectroscopy analysis. The corresponding mechanisms of the phase transformations mentioned above are discussed. View Full-Text
Keywords: titanium aluminides; ωo phase; TEM; HRTEM titanium aluminides; ωo phase; TEM; HRTEM

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Ye, T.; Song, L.; Quan, M.; He, J.; Lin, J. Precipitation Behavior of ωo Phase in Ti-37.5Al-12.5Nb Alloy. Metals 2017, 7, 192.

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