Cylindrical components of in situ functionally gradient composite materials of Al-19Si-5Mg alloy were manufactured by centrifugal casting. Microstructure characteristics of the manufactured components were observed and the effects of the used process factors on these characteristics were analyzed. The results of observations shows that, in thickness, the components possess microstructures accumulating lots of Mg 2 Si particles and a portion of primary silicon particles in the inner layer, a little Mg 2 Si and primary silicon particles in the outer layer, and without any Mg 2 Si and primary silicon particle in the middle layer. The results of the analysis indicate that the rotation rate of centrifugal casting, mould temperature, and melt pouring temperature have evidently affected the accumulation of the second phase particles. Also, the higher the centrifugal rotation rate, mould temperature, and melt pouring temperature are, the more evident in the inner layer the degree of accumulation of Mg 2 Si and primary silicon particles is.
Free end torsion was carried out on extruded Mg alloy AZ31. Subsequently, tension or compression was implemented on pretorsion specimens. The microstructures of samples with 100 and 200° of pretorsion reveal that no obvious change has occurred; however, samples with 300 and 400° of pretorsion show that there are extensive twins. Compressive yield stress of pretorsion samples increases with increasing pretorsion angle. However, their tensile yield stress exhibits practically the same value with extruded samples. Consequently, yield asymmetry ratio increases from 0.55 of extruded sample to 0.84 of sample with 400° of pretorsion. Both textures rotated around the radial axis by free end torsion, and different deformation mechanisms of compression and tension deformation result in decrease in yield asymmetry.
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