Abstract
A combination of conventional rolling and high-ratio differential speed rolling was used to enhance the dispersion of TiC particles in the in situ aluminum matrix composite fabricated through a chemical reaction involving TiO2, carbon and CuO powders, and the aluminum melt. An obvious improvement of the TiC particle dispersion was not achieved during conventional rolling applied up to a very large thickness reduction of 95%. The distribution of TiC, however, became reasonably homogenous after additional deformation by high-ratio differential speed rolling. The matrix grain size was also greatly reduced to 0.2μm. The critical conditions required to obtain a uniform distribution of reinforcement in the matrix by enforced plastic flow and the possible strengthening mechanisms of the composite were discussed.
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