چكيده به لاتين
Abstract
Creation of Lorentz force by simultaneous application of magnetic field and electric current is one of the applications of electromagnetics in material engineering. This force, which results from the interaction between the electric field and the magnetic field, is new in materials science, and has recently been introduced into the Metal Science. The electromagnetic process can be used to produce less complex alloys with less structural defects. This method emits less pollutants into environment. In This method, alloys can be melted in zero-gravity state and then solidified after taking the desirable form.
There are many unknown horizons in the electromagnetic processing of materials. Given that few studies have been conducted in this field, the present study is an attempt to investigate the effect of simultaneous application of electrical and magnetic forces on the solidification structure. To this end, a casting model was first designed, and then CO2 sand molding was performed. The current circuit was designed in a way that the molten metal acted as a switch so that the electrical current is connected immediately after the molten metal is pouring into the mold. Two magnets were used to apply a uniform magnetic field with magnitude of 900 Gauss. In this study, the intensity of the magnetic field is considered constant and the intensity of the electric current is considered variable. The optical microscope (OM), scanning electron microscopy (SEM) and XRD analysis were used to investigate the microstructure of casting samples. The results obtained from optical and electron microscopy showed that the grain size or morphology of the sediment phases have not changed at all. But the results of XRD analysis showed that with any change in the current density, the preferential orientation of grains changes accordingly. This change in the grain orientation can be attributed to the force applied to the molten metal.
Keywords: Lorentz force, Electromagnetic processing of materials, A319 Aluminum
