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

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The spectra of vanadium are not reported here, because the main V 2p peak was very low and was overlapping with the high O 1s peak, present as a consequence of the atmospheric oxidation. After a cycle of sputtering with Ar+ ions, the concentration of oxide was drastically reduced, but still it was not low enough in order to study the V 2p peak. 11a). 4 eV [21]. Ti-C and Al-C bonds can be due either to single pairs of metal-carbon atoms or to carbides. The comparison of the C 1s spectra, acquired in the points A, B and C (graphite layer), revealed a change of the intensity of the component at lower BE.

In this combination area the properties of the metallic phase are dominant. In the second area the change in deformation behaviour from metallic dominated to ceramic dominated takes place. In this area, microstructures with about 40% ceramic can be assigned. From 50% ceramic phase on the plastic part in the stress-strain behaviour gets noticeably smaller and the deformation behaviour of the composite approaches the one of ceramics. In principle according to Fig. 8 there will be no proportional transition of material behaviour from the pure metal phase to the pure ceramic phase with increasing ceramic volume fraction.

26 Advances in Metal Matrix Composites a) b) c) Fig. 3. 3 (b,c) can be fitted by the following relationships: a = a0 (1+α ∆T) (2) c = c0 (1+β ∆T) where a0 and c0 are the cell parameters at room temperature (300 K), α and β the expansion coefficients, ∆T the temperature increase. The values obtained by the best fitting are reported in Table 2. 14 x 10-5 Table 2. Ti6Al4V alloy and composite: cell parameters (a0, c0) at room temperature and thermal expansion coefficients (α, β). Lorella Ceschini and Roberto Montanari 27 At room temperature, the a0 and c0 values of composite are very close to those of the alloy.

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