Threshold stresses for dislocation climb over hard particles: The effect of an attractive interaction |
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| Affiliation: | 1. IMDEA Materials Institute, Eric Kandel, 2, 28906, Getafe, Madrid, Spain;2. Univ. Carlos III of Madrid & IAAB, Av. Univ. 30, 28911, Leganés, Madrid, Spain;3. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328, Dresden, Germany;1. School of New Technologies, Iran University of Science and Technology, Tehran, Iran;2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;3. Islamic Azad University, Takestan Branch, Department of Science, Physics Group, Takestan, Iran;1. State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin Key Lab of Composite and Functional Materials, Tianjin University, Tianjin, 300354, China;2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China;2. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan |
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| Abstract: | We present a model for the effect of an attractive interaction between dislocations and hard spherical particles on the process of dislocation bypass by local climb. The interaction is treated by assigning a line tension to the dislocation which is lower in the vicinity of the particle than in the matrix. We find that even for very modest interactions, the strongest barrier to dislocation bypass is no longer provided by the climb obstacle, but rather by the detachment of the dislocation from the particle after climb over the particle is complete. The model provides a possible explanation for some experimentally observed dislocation configurations in crept ODS superalloys and for the creep thresholds which are typical of such alloys. |
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