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By M. A. Taha, N. A. El-Mahallawy

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The mechanical properties of the embedding composite are computed through an iterative approach to the behaviour of the inner cell. Therefore, the elastic-plastic behaviour of the homogenised material can be calculated. Unmodified unit cell models can be applied for all sizes and shapes of reinforcement phases above a size of two microns. Below this size the “Mechanism-based Strain Gradient (MSG) Plasticity Theory” [3, 4] has to be considered to take the geometric necessary dislocations into account.

The results, reported in Table 3, demonstrate that the growth of the reaction zone is quite slow. 98 µm after 1,000 hours at 873 K. Moreover, it has been observed that long-term heat treatments do not substantially affect grain size that remains of about 30 µm. 30 Advances in Metal Matrix Composites a) b) Fig. 7. Measurements along different directions (a) permitted to determine the mean thickness of the reaction zone shown in (b). 98 Table 3. Thickness of the reaction zone after the heat treatments listed in Table 1.

Dislocations induced by plastic flow around the fibres by HIP are in large part recovered by the high temperature soaking and subsequent slow cooling with a resulting final density lower than that of the monolithic alloy, as evidenced by XRD measurements. a) b) Fig. 5. TiC particles form a layer of irregular thickness around the fibres (a). Bands with low dislocation density (b). Lorella Ceschini and Roberto Montanari 29 EDS, XPS, AES and SPEM analyses. Mechanical performances of composite strongly depend on the fibre-matrix interaction in fabrication process and in-service life where temperatures up to ~ 873 K are reached.

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