Dependence on temperature of tensile properties of the single-crystal superalloy DD11 |
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Authors: | Y F Liu Y S Zhao C G Liu Y Y Guo J Zhang Y S Luo |
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Affiliation: | 1. School of Materials Science and Engineering, Beihang University, Beijing, People’s Republic of China;2. Beijing Institute of Aeronautical Materials, Beijing, People’s Republic of China;3. Beijing Institute of Aeronautical Materials, Beijing, People’s Republic of China |
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Abstract: | Tensile tests within a temperature range from room temperature (RT) to 1100°C were performed on a novel second-generation single-crystal superalloy DD11. The experimental results indicated that the yield strength (YS) remained constant up to 760°C, while a maximum was reached at 850°C. The elongation and area reduction decreased gradually from RT to 760°C and then they increased rapidly at temperatures above 760°C. As for the deformation mechanism, when the temperature was below 850°C, the γ′ precipitates were sheared by isolated faults, faulted loops and dislocation pairs. The formation of dislocation networks and dislocation climb mechanism were confirmed at temperatures above 980°C. Finally, the relationship between the YS of the DD11 alloy and the operative deformation mechanism was discussed. |
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Keywords: | DD11 alloy full temperature range yield strength tensile plasticity fractographs deformed microstructure dislocation deformation mechanism |
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