Metal Matrix Composites Kainer by Karl U. Kainer

By Karl U. Kainer

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Without pores, agglomerates of particles or nonreinforced areas. 5 Thermal Expansion Coefficient Reinforcement of light metal alloys with ceramic fibers or particles entails a reduction in the thermal expansion coefficients. For this physical characteristic also, simple models are available to estimate the thermal expansion coefficients with the help of the characteristics of the individual components. The model of Schapery [34] was developed, in order to describe the influences on the thermal expansion coefficients: α3C = EF αF ÖF + EM αM (1 – ÖF) EC (26) where α3C is the axial thermal expansion coefficient, αF the thermal expansion coefficient of the fibers and αM the thermal expansion coefficient of the matrix.

Even better results are reached after the extrusion of feed material (Fig. 57c). In powder metallurgically manufactured composite materials (Fig. 57d) the extremely homogeneous distribution of the particles is noticeable after the extrusion Arrangement of typical structures of different particle reinforced light metal composite materials: (a) SiC-particle reinforced Al (mold cast [9]), (b) SiC-particle reinforced Al (die cast [10]), (c) SiC-particle reinforced Al (extruded powder mixture [11]), (d) SiC- particle reinforced Al (cast and extruded).

Thereafter the reinforcement effect increases with increasing fiber content and length. The presented calculations presuppose an orientation of the fibers in the stress direction, with an irregular arrangement there is a smaller reinforcement effect. Linear mixture rule of the tensile strength of unidirectional fiber composite materials, the right ordinate represents the effective fiber strength according to Eq. (9), after [23] and [27]. Fig. 3 Mechanism of Reinforcement Influence of the fiber length and volume content on the properties of magnesium composite materials (AZ91+Saffil-fibers) [28].

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