Effects of Particle Size on Microstructure of the Matrix Alloy in Aluminum Matrix Composites
Aluminum matrix composites, reinforced by 0.15μm and 5μm Al2O3 particles with 40% volume fractions were fabricated by squeeze casting technique. The microstructure characterization near the interfaces of Al2O3p/1070Al composites was investigated by SADP and HREM techniques. Results showed that high-density dislocations were generated in the 5μm-Al2O3p/Al composite due to the thermal mismatch stress. In contrast, the matrix of the 0.15μm-Al2O3p/Al composite appeared to be nearly free dislocations and some “micro distortion areas” of 1-5nm were observed, which was attributed to the dispersion of fine sub-micron particles and uniform distribution of the stress near the interfaces.
Yafang Han et al.
L. T. Jiang et al., "Effects of Particle Size on Microstructure of the Matrix Alloy in Aluminum Matrix Composites", Materials Science Forum, Vols. 546-549, pp. 1655-1659, 2007