Processing map and hot deformation behavior of Ta-particle reinforced TiAl composite |
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| Affiliation: | 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. The Institute for Future Transport and Cities, Faculty of Engineering, Environment and Computing, Coventry University, Coventry CV1 5FB, UK;3. Department of Mechanical Engineering, Binghamton University, Binghamton, NY 13902, USA;4. Key Laboratory of High-Temperature Structural Materials & Coatings Technology, Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China;5. School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | The hot deformation behavior of a Ta-particle reinforced TiAl composite was studied. Ti–48Al–2Cr–2Nb– 0.2W(at.%)/20vol.%Ta metal matrix composite was fabricated by spark plasma sintering. The deformation behavior was investigated by hot compression tests at the temperature ranging from 1050 to 1200 °C and the strain rate ranging from 1×10−3 to 1 s−1. The constitutive equation containing true strain variables was established. The values of activation energy Q under different strain degrees are between 240 and 280 kJ/mol, which are lower than that of pure TiAl. Based on dynamic material modeling, the processing maps at various strain degrees were established, and the optimized parameters for hot working are 1050–1100 °C and 0.005–0.01 s−1. The microstructural evolution during deformation was characterized, which indicated that the dynamic recrystallization plays an important role in this process. |
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| Keywords: | TiAl-based composite flow behavior processing map dynamics recrystallization |
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