Formation of Metal-and Ceramic-Matrix Composites and Its Computer-Aided Materials Design Based on Interface Properties

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In this project, metal-and ceramic-matrix composites were investigated to establish the computer-aided materials design. The formation processes to be analyzed in this work were the centrifugal casting and RF sputtering processes.A new analytical method was proposed to evaluate the unsteady state on temperature, particle dispersion and stress fields during the centrifugal casting process. The proposed procedure was developed by means of finite element modeling. A simulation using the proposed model was conducted for the material system of aluminium alloy as matrix and SiC particle. The simulated results almost coincided with the experimental observation. Another finite element model was developed to evaluate fiber reinforced metal matrix composites. The simulation was conducted on the SiC-fiber reinforced Al alloy to show stress concentration around the matrix-fiber interface. The experimental results revealed that the carbon coating on fiber improved the mechanical properties in SiC continuous fiber reinforced SiC ceramics.Thin films of alumina and silicon carbide were deposited on the glass substrate in an RF magnetron spattering apparatus. The hardness, as a mechanical property, of the sputtered films were evaluated by using an ultra-microscopic hardness testing machine. It was found that the hardness decreased with increasing RF output power in both ceramic films. A molecular dynamics approach was tried to estimate the internal stress field in sputtered film. A hard-sphere 3D model was adopted in the molecular dynamics of sputtered particles. Based on empirical information, cluster of spattered particles was assumed to be larger with increasing RF output power. The experimental result was explained qualitatively by using the proposed analytical method.