N. B. Pugacheva, N. S. Michurov, T. M. Bykova
THE STRUCTURE AND PROPERTIES OF THE 30Al-70SiC METAL MATRIX COMPOSITE MATERIAL
The paper presents the results of studying the structure of cylindrical workpieces made of a composite material with an aluminum-alloy matrix and silicon carbide particles as a filler. It is shown that, for the material to be highly filled with a reinforcing agent, particles of two standard sizes are used, namely, 1 to 5 µm and 15 to 20 µm, the particles being shaped mainly as irregular prisms. The studied metal matrix composite is characterized by the value of the thermal coefficient of linear expansion of 11.5×10-6 K-1 in the range between 20 °C and 100 °C, heat conductivity of 193 W/m∙K, density of 2.92 g/cm3, hardness of 95 HV 0.2, and an elastic modulus of 112 GPa. Strong adhesive interaction between the metal matrix and the SiC filler particles has been revealed, which manifests itself in the nature of specimen ruptures after tensile testing.
Keywords: composite material, metal matrix, filler, hardness, heat conductivity, density, linear expansion, fracture