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Experimental evidence of structural evolution for TiB2 microcrystal under externally high stresses
Authors:Fei Huang  Zhengyi Fu  Aihua Yan  Weimin Wang  Hao Wang  Jinyong Zhang  Qingjie Zhang
Affiliation:1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Nanomaterial and Smart Sensor Research Laboratory, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430070, China;1. National Isotope Centre, GNS Science, Lower Hutt, New Zealand;2. The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand;3. RUBION, Ruhr-University Bochum, Germany;4. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Germany;1. Research Center of Material and Chemical Engineering, School of Material and Chemical Engineering, TongRen University, Tongren 554300, PR China;2. Lanzhou Institute of Chemical Physics, Lanzhou 735000, PR China;3. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, PR China;1. Institute of Physics, Academy of Science of the Czech Republic, Dielectrics Department, Na Slovance 2, 18221 Prague 8, Czech Republic;2. Institute of Physical Chemistry “Ilie Murgulescu” of Romanian Academy, Molten Salts Department, Spl. Independentei 202, 060021 Bucharest, Romania;3. CNRS, UPR3079 CEMHTI, Disorder and Optical Properties, 1D Avenue de la Recherche Scientifique, 45071 Orleans, Cedex 02, France;4. Universite d’Orleans, BP6749, Orléans, F-45067 Cedex 2, France;1. School of Materials Science and Engineering, Beijing Institute of Technology, 100081, Beijing, PR China;2. Jiangsu Bree Optronics Co.,Ltd., 210000, Nanjing, PR China;1. The MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, PO Box 600, Wellington, 6140, New Zealand;2. National Isotope Centre, GNS Science, PO Box 31312, Lower Hutt, 5010, New Zealand;3. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328, Dresden, Germany;1. School of Transportation, Ludong University, Yantai 264025, Shandong Province, PR China;2. Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Wangcheng Avenue 90, Luoyang 471023, Henan Province, PR China
Abstract:The morphology evolution and defect structure of TiB2 microcrystals treated under high stresses were analyzed using scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results show that hexagonal TiB2 with large particle size gradually evolved to flowerlike TiB2 with small particle size under high stresses. The evolution process is mainly determined by the preferential cleavage of TiB2 microcrystal, and the presence of multiple lamellar nanotwin and edge dislocation directly provides some evidence of plastic deformation and structural evolution. For clarity, a possible model is suggested based on the HTREM observation and the natural properties of TiB2 materials to explain the process mechanism.
Keywords:
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