In-situ fabrication of particulate reinforced aluminum matrix composites under high-frequency pulsed electromagnetic field

摘要

Pulsed magnetic field is generated when imposing pulse signal on high-frequency magnetic field. Distribution of the inner magnetic intensity in induction coils tends to be uniform. Furthermore oscillation and disturbance phenomena appear in the melt. In-situ Al_2O_3 and Al_3Zr particulate reinforced aluminum matrix composites have been synthesized by direct melt reaction using Al-Zr(CO_3)_2 components under a foreign field. The size of reinforced particulates is 2-3 μm. They are well distributed in the matrix. Thermodynamic and kinetic analysis show that high-frequency pulsed magnetic field accelerates heat and mass transfer processes and improves the kinetic condition of in-situ fabrication.