The structure and properties of the 30Al-70SiC metal matrix composite material

Abstract

Diagnostics, Resource and Mechanics of materials and structures Issue 6, 2015 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/cm 3 , 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. Fernández R., González-Doncel G. Understanding the creep fracture behavior of aluminum alloys and aluminum alloy metal matrix composites. Materials Science and Engineering: A, 2011, vol. 528, iss. 28, pp. 8218-8225. DOI: 10.1016/j.msea.2011 Su Y., Ouyang Q., Zhang W., Li Zh., Guo Q., Fan G., Zhang D. Composite structure modeling and mechanical behavior of particle reinforced metal matrix composites.

Effect of the content of SiC on the structure and properties of D16 alloy matrix composites

“…The thickness of the SiC particle clustering regions increases with the filler volume fraction in the composite ( fig. 2a) [3]. When the filler content is 5 vol%, each filler particle is surrounded by the aluminum matrix, i. e. the matrix-SiC bonding prevails, whereas when the SiC content is 10, 20 and 30 vol%, the percentage of the SiC-SiC bonding increases.…”

“…The microstructure of the AMC was studied on the transverse sections with the use of a Neophot-21 optical microscope. The density was determined hydrostatically according to ASTM B311-93 weighing the specimens in air and in distilled water with a density of 998 kg/m 3 where m 1 is specimen mass in air, m 2 is specimen mass in water, ρ w is distilled water density.…”

Hierarchical modeling of deformation and damage of metal matrix composite under uniaxial loading conditions

“…1, which is obtained by means of scanning electron microscope. Experimental studies observe strong adhesive bonding between the matrix and reinforcement particles [13,14].…”

“…According to the approach, the composite volume on microlevel is modeled by three-dimensional continuum which represents the aluminum matrix with embedded silicon carbide particles. The microstructural properties of the metal matrix composite have been chosen according to metallographic investigation [13,14]. The composite microvolume has the shape of a cube with the edge size of 30 µm.…”

“…In [13,14] it is determined experimentally that in metal matrix composite specimen loading process, first cracks appear in the matrix. Considering this failure behavior, the matrix damage accumulation has been studied in scope of this work.…”