Abstract:
TEM and HREM observations of the MoSi
2-SiC composite synthesised in situ reveal that large amounts of dislocations exist in the MoSi
2 matrix specially near the interfaces between MoSi
2 math and the SiC particles, and the SiC particles typically contain defects including twins and stacking faults. Nanoindentation investigation shows that there exists a gradient distribution of microhardness near the interface of MoSi
2/SiC. The microstructurd characters above can be attributed to the residue heat stress due to the CTE discrepancy between MoSi
2/SiC generated in the cooling process of the production.
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