Dislocation climb in Mo5SiB2 during high-temperature deformation |
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| Affiliation: | 1. Engineering Research Center of Tribology and Materials Protection, Ministry of Education, Non-ferrous Metal Generic Technology Collaborative Innovation Center, Henan University of Science and Technology, Luoyang, Henan, 471023, China;2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials and Engineering, Tianjin University, Tianjin 300072, China;2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;1. CEIT-IK4, Paseo Manuel de Lardizabal 15, 20018 San Sebastian, Spain;2. IK4 LORTEK Technological Center, Arranomendi Kalea 4A, 20240 Ordizia, Gipuzkoa, Spain;1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;2. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;3. Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, PR China |
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| Abstract: | During high-temperature compression tests on intermetallic Mo5SiB2, the dislocation microstructures vary with increasing temperature and strain rate. At 1400 °C, an increasing tendency exists for slip planes to be of an unexpected type (e.g., {143) and {523)) as a function of the decreasing strain rate and increasing strain that originates from a dislocation climb. As the temperature increases to 1600 °C, the internal strain rate of 6.07 × 10− 3 s− 1 from the dislocation climb at 4% strain exceeds the applied value of 1.67 × 10− 3 s− 1, and thus, the climb mainly controls the plastic strain, as evidenced by a strength that is lower than that at 1200 °C under the same conditions. |
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