Dispersion of TiC particles in an in situ aluminum matrix composite by shear plastic flow during high-ratio differential speed rolling

作者：Kim W J^*; Hong S I; Lee J M; Kim S H

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2013, 559: 325-332.

DOI：10.1016/j.msea.2012.08.106

• Mechanical characterization
• Aluminum alloys
• Thermomechanical processing
• Grain refinement
• Composites

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 0.2 mu m. 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.

• 出版日期2013-1-1