TOUGHENING OF IN SITU SYNTHESIZED MoSi2-SiC COMPOSITE AT ROOM TEMPERATURE
来源期刊:Acta Metallurgica Sinica2002年第3期
论文作者:J.Zhu L.Q.Zhang Z.Q.Sun X.W.Fu W.Y.Yang
Key words:MoSi2-SiC composite; synthesized in situ; fracture; toughening at room temperature;
Abstract: 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.
J.Zhu1,L.Q.Zhang2,Z.Q.Sun3,X.W.Fu2,W.Y.Yang2
(1.School of Materials, Tsinghua University, Beijing 100083, China;
2.School of Material Science & Engineering, University of Science & Technology Beijing, Beijing 100083, China;
3.The State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China)
Abstract: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.
Key words:MoSi2-SiC composite; synthesized in situ; fracture; toughening at room temperature;
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