TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE

金属学报(英文版), 2002, 15(3): 317-323.

^1, , ^2, , ^3, , ^4, , ^5,

1.The State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China

2.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

3.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

4.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China

5.School of Materials, Tsinghua University, Beijing 100083, China

基金项目: 国家自然科学基金(59895150-04-02)

TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE

Keywords： MoSi2-SiC composite

The in situ synthesized MoSi2-SiC composite is proved to be of higher fracture tough-ness than the monolithic MoSi2. The TEM and HREM study reveals that the interfacebetween MoSi2/SiC is of direct atomic bonding without any amorphous glassy phase,such the SiO2 structure. Based on the fractography and the observation of crack prop-agation path from indentation, it is concluded that the toughening of such compositeat room temperature can be attributed to the high interfacial binding energy, the re-finement of the MoSi2 matrix and the defection and bridging behavior in the crackpropagation.

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TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE

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