Effect of Nb particles on the flow behavior of TiAl alloy |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;2. School of Aeronautics and Astronautics, Central South University, Changsha 410083, PR China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Central South University, Changsha 410083, China;3. Department of Modern Mechanics, University of Science & Technology of China, Hefei 230027, China |
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| Abstract: | High temperature compressive deformation behaviors of PM-TiAl alloy containing Nb particles (Ti–45Al–5Nb–0.4W/2Nb (at. %)) were investigated at temperatures ranging from 1050 °C to 1200 °C, and strain rates from 0.001 s−1 to 1 s−1. The flow curves were employed to develop constitutive equations, and the apparent activation energy of deformation Q was determined as 447.35 kJ/mol. A revised processing map was constructed on the basis of the flow stress, which can accurately describe the deformation behaviors and predict the optimum hot forging condition. The addition of 2% Nb particles reduces the peak stress and increases the activation energy of TiAl-based intermetallic, however, it increases the instable domain in the processing map. |
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| Keywords: | A. Titanium aluminides, based on TiAl B. Deformation map D. Microstructure |
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