Plastic deformation of single crystals of TiSi2 with the C54 structure |
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| Affiliation: | 1. Division of Nuclear Material and Fuel, State Power Investment Corporation Research Institute, Beijing, 100029, PR China;2. School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning, 437100, PR China;3. Department of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing, 100029, PR China;1. Institute of Dentistry, Department of Biomaterials Science and Turku Clinical Biomaterials Centre (TCBC) and BioCity Turku Biomaterials Research Program, Itäinen Pitkäkatu 4 B, 20520 Turku, Finland;2. Nordic Institute of Dental Materials–NIOM, University of Oslo, Oslo, Norway;3. Welfare Division, Turku, Finland;1. School of Electrical Information and Engineering, Henan Institute of Engineering, Zhengzhou 451191, China;2. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China;3. Fine Optical Engineering Research Center, Chengdu 610041, China;1. Department of Mechanical Engineering, Academy of Armored Forces Engineering, 100072 Beijing, PR China;2. College of Equipment Engineering, Engineering University of Chinese Armed Police Force, 710086 Xi’an, PR China |
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| Abstract: | The deformation behavior of single crystals of TiSi2 with the orthorhombic C54 structure has been investigated as a function of crystal orientation in the temperature range from room temperature to 1400 °C in compression. Plastic flow is possible only when slip along <110> on (001) is operative and no other slip systems are observed in the whole temperature range investigated. While plastic flow is observed above 300 °C for as-grown crystals, the onset temperature for plastic flow is lowered considerably down to room temperature when the crystal is prestrained at 1300 °C and then re-deformed at low temperatures. The critical resolved shear stress (CRSS) for (001)<110> slip decreases with increasing temperature, exhibiting a moderate peak (or plateau) in the temperature range from 800 to 1100 °C. The deformation mechanism of TiSi2 is discussed in comparison with those reported for other transition-metal disilicides with the C11b and C40 structures, which are closely related to the C54 structure of TiSi2. |
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