A novel semisolid stirring and rheo-rolling process for preparing Mg–3Sn–1Mn–3Si C(wt%) composite strips was proposed, and the effects of process parameters of semisolid stirring on microstructures of Mg–3Sn–1Mn–3Si C(wt%)composite strips were investigated. The average grain size and roundness decrease, and the distribution of Si C becomes more homogeneous with the decrease in stirring temperature and the increase in the stirring speed. When the stirring time is increased, the distribution of Si C particles tends to be homogeneous, and the average grain diameter and roundness of aMg grain decrease. Under the following process parameters: the stirring temperature at 640 °C, the stirring speed at1100 rpm, the stirring time at 30 min and the roll speed at 0.2 m/s, Mg–3Sn–1Mn–3Si C(wt%) strip with a cross-sectional size of 4 mm 9 160 mm was prepared. The ultimate tensile strength and elongation of Mg–3Sn–1Mn–3Si C(wt%)composite strip reached 226 ± 6 MPa and(7.4 ± 0.2)%, which are obviously improved in comparison with Mg–3Sn–1Mn(wt%).
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