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65 % (volume fraction，the same below) SiCp/A356 composites with different holding time (6,12 h) were prepared by powder metallurgy. The microstructure and interfacial reaction of 65% SiCp/A356 composites were characterized by Optical Microscopy(OM)，X ray Diffraction(XRD)，Scanning Electron Microscopy(SEM) and Transmission Electron Microscopy(TEM). The results show that at 630 °C hot pressing temperature, the density of the material after holding for 12 h is better than that of holding for 6 h，and there is obvious precipitation of Si phase; slight interfacial reaction occurs, the reaction product is mainly Mg Ab O4, and no harmful phase AI4C3 is found. The elastic modulus，thermal conductivity and thermal expansion coefficient of the material were 210 GPa, 216 W/(m • K) and 7. 3 X 10-6/°C (50 300 °C)respectively. [ABSTRACT FROM AUTHOR]

The effects of cold rolled reduction rate on the deformation texture and microstructure of pure aluminum processed ECAP (equal channel angular pressing) were studied. The results show that when reduction rate is relatively low，microstructure of the pure aluminum trend towards uniformity during the cold rolled process. However ?with the increase of deformation rate?grain shape converts from equiaxed to fibrous grain. Texture evolve form rotated cube texture and {111} <110〉to the cold rolled texture (copper texture/brass texture and S texture)，R texture appears simultaneously. It is proved the influence of ECAP on the structure and texture of the pure aluminum during the cold rolled process exist. [ABSTRACT FROM AUTHOR]