Study On The Production Of Particle Reinforced Aluminum Alloy Composite Material Under High Frequency Electromagnetic Field

The electromagnetic separating technology is a new kind of separating liquid alloy technology. The basic principle is based on the electric discrepancy between the inclusion and alloy, the inclusion moves to outside by the extrusion force of electromagnetic field, and then the alloy got purified. Electromagnetic separating technology is mass disposal, strong separating force, wide used and none pollution. At present, it is not only widely used in aluminum alloy liquid purification, but also applied in gradient composite preparation of different surface performance to satisfy the request of material's special performance.In order to prepare the particle reinforced Al-matrix composite material, high frequency electromagnetic field is used to fabricate the Al—Si, Al—Mg₂Si particle reinforced composite material. Through it, series of available experiment parameters are ascertained and hollow column composite materials are thus fabricated. By the X -Ra diffract analyze and SEM analyze, the phase of Al—Mg₂Si alloy is ascertained. By the measurement of micro-hardness and the metallographic photo, the formation rule, the structure and performance of Al-Si gradient composite material is analyzed. The result indicates that it is possible to use high frequency electromagnetic field to prepare the solid stick and hollow column Al—Si and Al—Mg₂Si particle reinforced composite material, in which the primary Si and Mg₂Si present the gradient distribution along radius direction. When the electromagnetic power is 6kW, and acting time 3Os, the solid stick samples got very good separation effect. The electromagnetic intensity, the acting time and the heat effect are the main factors which influence the separating result. By controlling the electromagnetic intensity, acting time and cooling method to release the electromagnetic field's heat effect, it can actualize primary Si and Mg₂Si presenting gradient distribution along radius direction in Al—Si and Al—Mg₂Si alloy. The hollow column sample of Al-Si composite material has good separating result under power 3kW, time 30s. Its top and bottom sections both have good separating result, and the micro-hardness is symmetrical along radius direction.