Influence of silicide on fracture behavior of a fully lamellar Ti-46Al-0.5W-0.5Si alloy |
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| Authors: | Chen Hui Su Yanqing Luo Liangshun Li Xinzhong Wang Zhantao GuoJingjie Fu Hengzhi |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;College of Electromechanical Engineering, Northeast Forestry University, Harbin 150040, China
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The fracture behavior of fully lamellar binaryγ-TiAl alloys is extremely anisotropic with respect to the lamellar orientation.For the fully lamellar Ti-46Al-0.5W-0.5Si alloy,the existence of silicide clusters plays a critical role on the fracture behavior.In the present study,tensile test and three point bending test were performed at room temperature with the loading axis parallel and perpendicular to the lamellar orientation,respectively.To investigate the influence of silicide clusters on the initiation and propagation of cracks,the fracture surface and the cracks adjacent to the fracture zone of the specimens have been analyzed.Results show that the fracture process is related to the morphology and distribution of the silicide clusters.Crack preferentially initiates at and propagates along the interface of silicide andα 2 /γlamellar with the loading axis perpendicular to the length direction of silicide.While the silicide can prevent the propagation of cracks from running across with the crack growth direction perpendicular to the length direction of silicide. |
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| Keywords: | γ-TiAl alloy full lamellar silicides fracture behavior |
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