Effect of electromagnetic fields on the microstructure and properties of 2195 aluminum alloy cast-rolled plate
Metallographic microscopy(OM),scanning electron microscopy(SEM),differential scanning calorimetry(DSC),and tensile test were adopted to study the effect of different electromagnetic fields on the microstructure and mechanical properties of 2195Al alloy plates.The macroscopic and microscopic segregation of cast-rolled plate and mecha-nism of action caused by the application of electromagnetic fields in the traditional twin-roll casting processes were elaborated.The results show that due to the rapid solidification char-acteristics of the twin-roll casting process,central segregation bands appear in the cast-rolled plate.After applying steady and static magnetic field,pulsed electric field and electromag-netic oscillation field,the grain size of twin-roll cast rolled plate decreases gradually,and the minimum secondary dendrite arm spacing can be reduced to 9.81 μm.Element segrega-tion is almost eliminated,and the number of non-equilibrium eutectic phases also shows a significant downward trend.Meanwhile,the electromagnetic oscillation field increases the nuleation rate of 2195 Al alloy melt during solidification,then increases the yield strength by 58 MPa,the tensile strength by 34 MPa,and the elongation by 4.0%.It inhibits the growth of dendrites,then reduces the grain size and segregation,and significantly improves the me-chanical properties.
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