Work hardening and recovery of gamma base titanium aluminides |
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Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China;2. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China;3. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA |
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Abstract: | Micromechanisms of deformation contributing to work hardening of γ-base titanium aluminides at room temperature have been investigated. Deformation has been considered as stress driven thermally activated process and the experiments described were designed to identify the nature of glide obstacles generated during deformation. The investigations involve mechanical testing, electron microscope observations of the defect structure and recovery experiments. The investigations give supporting evidence that work hardening is derived from long-range elastic interactions between dislocations on parallel and oblique slip planes. Another source of work hardening arises from dislocation dipoles and debris defects, which were trailed and terminated at jogs in screw dislocations and can be overcome with the aid of thermal activation. These defects probably give rise to a significant recovery of the work hardening upon annealing. |
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