Comprehensive Composite Materials [Vol 3 - Metal Matrix

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A final difficulty is the narrow field of view of TEM. This is problematic as MMCs are less homogeneous than monolithic metals and the dislocation density can vary significantly across the sample. This can be overcome by making a large number of measurements; Arsenault et al. (1991a) made tens to hundreds of micrographs for each foil and measured 5±6 foils for each data point. Sample preparation for MMCs is summarized by Clyne and Withers (1993). A typical procedure is described in Guo et al. 5 KeV until a hole is punched in the dimple.

3%. Misfit stresses generated between adjacent phases during a transformation can be relieved plastically by formation of 12 Dislocations in Metal Matrix Composites Figure 6 Misfit dislocations near the end of a SiC whisker in pure aluminum deformed 3% in tension (tensile axis indicated as TA). Dislocations are partially pinned by fine oxide dispersoids (from powder metallurgy processing) and are organized in walls (marked W) in some areas (dark field TEM micrographs from Barlow and Hansen, 1995).

Dislocation nucleation and strain distributions are affected. (8) Dislocations are not equilibrium defects, and homogeneous plastic shear theoretically requires no dislocation storage to accommodate the change in shape. Empirically, substantial accumulation of dislocations is observed even in single crystal deformation. Dislocations are especially numerous in metals where dislocation energy is low due to the nondirectional nature of metallic bonds and the short distance between close-packed planes.

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