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http://dx.doi.org/10.3740/MRSK.2004.14.9.649

Toughening of SiC Whisker Reinforced Al2O3 Composite  

Kim Yon Jig (Dept. of Industrial Facilities Control, Iksan National College)
Song Jun Hee (Faculty of Mechanical Engineering, Research Institute of Industrial Technology, Chonbuk National University)
Publication Information
Korean Journal of Materials Research / v.14, no.9, 2004 , pp. 649-654 More about this Journal
Abstract
In this paper, the fracture toughness and mechanisms of failure in a random SiC-whisker/$Al_{2}O_3$ ceramic composite were investigated using in situ observations during mode I(opening) loading. $SiC_{w}/Al_{2}O_3$ composite was obtained by hot press sintering of $Al_{2}O_3$ powder and SiC whisker as the matrix and reinforcement, respectively. The whisker and powder were mixed using a turbo mill. The composite was produced at SiC whisker volume fraction of $0.3\%$. Compared with monolithic $Al_{2}O_3$, fracture toughness enhancement was observed in $SiC_{w}/Al_{2}O_3$ composite. This improved fracture toughness was attributed to SiC whisker bridging and crack deflection. $SiC_{w}/Al_{2}O_3$ composite exhibited typically brittle fracture behavior, but a fracture process zone was observed in this composite. This means that the load versus load-line displacement curve of $SiC_{w}/Al_{2}O_3$ composite from a fracture test may involve a small non-linear region near the peak load.
Keywords
fracture process zone; crack-tip microcracking zone; crack-flank fiber bridging; crack deflection; breakage; interfacial shear traction;
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