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| TOUGHENING OF IN SITU SYNTHESIZED MoSi_2-SiC COMPOSITE AT ROOM TEMPERATURE | |
| 作者单位： | Z.Q.Sun(The State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China);L.Q.Zhang,W.Y.Yang,X.W.Fu(School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China);J.Zhu(School of Materials, Tsinghua University, Beijing 100083, China) |
| 基金项目： | the National Natural Science Foundation of China (No. 59895150-04-02). |
| 摘 要： | 二．InttodttCt1OllMoslZ meets thebaslc requirements for ahlgh temperature structuralmaterlal．凡reXampk,nhas a hi吵一king pdntd2030”C,rd扒IV*y high re幻s枯nCe扣high比m－perature。ldatlon,alow density of6．249/cm’,ahlgh modulus,adequate strength at1200－ |
TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE |
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| Z.Q.Sun,L.Q.Zhang,W.Y.Yang,X.W.Fu,J.Zhu. TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE[J]. Acta Metallurgica Sinica(English Letters), 2002, 15(3): 317-323 | |
| Authors: | Z.Q.Sun L.Q.Zhang W.Y.Yang X.W.Fu J.Zhu |
| Affiliation: | 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 Materials, Tsinghua University, Beijing 100083, China |
| Abstract: | The in situ synthesized MoSi2-SiC composite is proved to be of higher fracture toughness than the monolithic MoSi2. The TEM and HREM study reveals that the interface between 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 propagation path from indentation, it is concluded that the toughening of such composite at room temperature can be attributed to the high interfacial binding energy, the refinement of the MoSi2 matrix and the deflection and bridging behavior in the crack propagation. |
| Keywords: | MoSi2-SiC composite synthesized in situ fracture toughening at room temperature |
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