Fractal analysis of crack paths in Al2O3-TiC-4%Co composites

被引：0
|
作者：
李静 [1 ]
尹衍升 [2 ]
刘英才 [2 ]
马来鹏 [3 ]
机构：
[1] 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 
来源：
Transactions of Nonferrous Metals Society of China | 2006年 / 04期
关键词：
Al2O3-TiC-Co; Al2O3-TiC; fractal; toughening mechanism; indentation crack;
D O I：
暂无
中图分类号：
TB331 [金属复合材料];
学科分类号：
摘要：
Al2O3-TiC-4%Co(volume fraction) composites(ATC) with high toughness (7.8±0.8 MPa·m1/2) and strength (782±60 MPa) were fabricated. In comparison with Al2O3-TiC composites(AT), the fracture toughness was significantly improved 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.
引用
收藏
页码：795 / 799
页数：5
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