Abstract
The commercial alloy 2024 was directionally solidified under different magnetic fields and its microstructure and tensile mechanical properties were investigated. The application of magnetic field during solidification and the following heat treatment were demonstrated to improve the tensile strength and elongation properties of alloy 2024. This is because the formation of microstructure during solidification and the distribution of secondary phase after heat treatment were alternated by the magnetic field. It was found that the primary dendrite arm spacing decreases first and then increases with the magnetic field raising. The result is ascribed to the influence of magnetic field on the fluid flow during solidification. In addition, the effect of high static magnetic field on the secondary phase fraction was also studied in both as-cast and heat treatment samples, the fraction of secondary phase increased in the sample solidified under magnetic field. However, after T6 heat treatment, more secondary phase was dissolved into the α-Al matrix due to the magnetic damping effect on the solute distribution during solidification process.
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