Experiments and analyses on tensile behaviour of a TiAl alloy with lamellar structure |
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| Authors: | Min Fu Youshi Hong Youli Ma and Shiqiong Li |
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| Affiliation: | (1) State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, People's Republic of China;(2) State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, People's Republic of China;(3) Department of Superalloys, Central Iron and Steel Research Institute, Beijing, 100081, People's Republic of China |
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| Abstract: | An as-cast Ti-47AI-I Cr-2.5V plate was used to perform ambient tensile test. The metallography of the specimen exhibits typical lamellar structure with two-phase titanium aluminides. Monotonic tension tests under mechanical test systems of MTS-810 and Scanning Electron Microscope (SEM), along with a novel holder, were carried out regarding microstructure influence on crack initiation. Test results give the orientation preference of initiated cracks, i.e. 40°, 60° and 90°. Furthermore, with respect to crystallography and a model of interface mechanics, related mechanisms are discussed. |
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