| Fractal analysis of crack paths in Al2O3-TiC-4%Co composites |
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| 作者姓名： | LI Jing YIN Yan-sheng LIU Ying-cai MA Lai-peng . Institute of Materials Science and Engineering Ocean University of China Qingdao China . |
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| 作者单位： | Institute of Materials Science and Engineering Ocean University of China Qingdao 266003 ChinaDepartment of Materials Science and Engineering Shandong Institute of Architecture and Engineering Ji'nan 250101 China，Institute of Materials Science and Engineering Ocean University of China Qingdao 266003 China，Institute of Materials Science and Engineering Ocean University of China Qingdao 266003 China，Key Laboratory for Liquid Structure and Heredity of Ministry of Education Shandong University Ji’nan 250061 China |
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| 摘 要： | 1 Introduction Al2O3-TiC composite (denoted by AT) is an important material for structural components due to the high strength, hardness, as well as chemical stability and wear resistance. However, the low fracture toughness still cannot match the comman…
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| 关 键 词： | Al2O3-TiC-Co Al2O3-TiC 高温回火 锯齿形裂纹 分形分析 |
| 收稿时间： | 2005-10-26 |
| 修稿时间： | 2006-02-27 |
Fractal analysis of crack paths in Al2O3-TiC-4%Co composites |
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| LI Jing,YIN Yan-sheng,LIU Ying-cai,MA Lai-peng.Fractal analysis of crack paths in Al2O3-TiC-4%Co composites[J].Transactions of Nonferrous Metals Society of China,2006,16(4):795-799. |
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| Authors: | LI Jing YIN Yan-sheng LIU Ying-cai MA Lai-peng |
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| Affiliation: | 1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266003, China;2. Department of Materials Science and Engineering, Shandong Institute of Architecture and Engineering, Ji''nan 250101, China;3. Key Laboratory for Liquid Structure and Heredity of Ministry of Education, Shandong University, Ji''nan 250061, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Shanghai, 200050, China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, Donghua University, Shanghai, 201620, China;3. Department of Materials, Loughborough University, Leicestershire, LE11 3TU, United Kingdom;4. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. CSNSM, Université Paris-Sud, CNRS-IN2P3, Bât. 108, 91405 Orsay, France;2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA;3. Helsinki Institute of Physics and Department of Physics, University of Helsinki, P.O. Box 43, Helsinki FI-00014, Finland;4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;5. CIMAP, CEA–CNRS–ENSICAEN-University of Caen, 14070 Caen Cedex 5, France;6. Institut PPRIME, ENSMA–CNRS-University of Poitiers, BP 30179, 86962 Futuroscope-Chasseneuil Cedex, France;1. Ramapo College of New Jersey, Mahwah, NJ 07430, USA;2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;3. Research Institute, Kochi University of Technology, Kami, Kochi, 782-8502, Japan;4. National Institute for Laser, Plasma, and Radiation Physics, Bucharest-Magurele, Romania;5. CEA/DEN/DANS/DM2S/SERMA/LEPP-LRC CARMEN CEN Saclay France & CNRS/ SPMS UMR8785 LRC CARMEN, Ecole Centrale de Paris, F92292, Chatenay Malabry, United States;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;1. Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow 125412, Russia;2. Moscow Institute of Physics and Technology (State University), Dolgoprudny 141700, Russia |
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| Abstract: | Al2O3-TiC-4%Co(volume fraction) composites(ATC) with high toughness (7.8±0.8 MPa·m½) and strength (782±60 MPa) were fabricated. In comparison with Al2O3-TiC composites(AT), the fracture toughness was significantly unproved by 60%. The crack paths, generated by Vickers indentation on the polished surfaces of both composites, were analyzed from a fractal point of view to distinguish the possible toughening mechanisms involved. Quantitative evaluation of indentation cracks indicates that the crack deflection plays a more effective role. Cracks of the ATC composites show higher deflection angles and more deflections along the path. ATC composites present higher fractal dimension (D = 1.07) than AT composites (D = 1.02), which is directly related to the higher fracture toughness. A significant relationship between crack path and toughness is evident: the more irregular the geometry of the crack, the higher the fracture toughness. |
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| Keywords: | Al2O3-TiC-Co Al2O3-TiC fractal toughening mechanism indentation crack |
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