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Materials 2017, 10(2), 201;

Low Temperature Phase Transformations in Copper-Quenched Ti-44.5Al-8Nb-2.5V Alloy

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
State Key Laboratory of Advanced Welding and Joining, Harbin 150001, China
College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Authors to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 27 November 2016 / Revised: 27 January 2017 / Accepted: 10 February 2017 / Published: 18 February 2017
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In this study, an easily controlled transformation similar to the β + α → β + α + γ and the analysis of metastable phases in a β solidifying Ti-44.5Al-8Nb-2.5V alloy were investigated. Therefore, a liquid alloy copper-quenching followed by annealing at an application temperature (850 °C) has been carried out. Following quenching, a microstructure composed of several supersaturated phases—the basket-weave β0bv) phase, the plate-like α2p) phase and the stripe-like γ (γs) phase—was obtained. In the annealing processes, phase transformations in the prior βbv and αp phases domain corresponded nicely to the β + α → β + α + γ transformation during solidification. Also, in the annealed γs phase, the kinetics of the phase transformations involving the metastable L12 phase was firstly detected by transmission electron microscopy (TEM). The L12 phase had a lattice structure similar to the γ phase, whereas the composition of the phase was similar to the α2 phase. The formation of the γ pre-twin phase with an anti-phase boundary (APB) was detected in the γs phase of the matrix. The orientation relationships between the γs and precipitated: γ (γp) phase are <101]γs//<114]γp, (10 1 ¯ s//( 1 ¯ 10)γp and (0 1 ¯ 0)γs//(22 1 ¯ p. View Full-Text
Keywords: titanium aluminides; low temperature phase transformation; L12 phase; γ pre-twin titanium aluminides; low temperature phase transformation; L12 phase; γ pre-twin

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Cao, S.; Xiao, S.; Chen, Y.; Xu, L.; Wang, X.; Han, J. Low Temperature Phase Transformations in Copper-Quenched Ti-44.5Al-8Nb-2.5V Alloy. Materials 2017, 10, 201.

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