Effects of high niobium addition on the mechanical properties and high-temperature deformability of gamma TiAl alloy |
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| Affiliation: | 1. Beijing Guowang Fuda Science & Technology Development Co., Ltd., Beijing 100070, China;2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;3. Automotive Engineering Product Research & Development Institute, Borgward Automotive Co., Ltd., Beijing 102206, China;1. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, PR China;3. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China |
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| Abstract: | The effects of Nb on the mechanical properties, high-temperature deformability and some other basic properties of TiAl–Nb alloys were investigated over a wide compositional range, and an appropriate composition for high-temperature applications was investigated for both wrought and cast materials. The lattice parameter of Ti–50Al–xNb alloy, which is a γ single phase alloy, shows an anisotropic variation with Nb content. This lattice distortion is assumed to be responsible for the strengthening and embrittlement of high-Nb ternary alloys. In the case of wrought materials, no appropriate composition exists in the high-Nb content region since wrought materials require good forgeability and high-temperature strength which are properties of antithesis. In the case of cast materials, however, an appropriate composition exists in the vicinity of Ti–46Al–7.5Nb (at.%). |
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