Research on Incorporation Process by Electromagnetic Melt Stirring Based on Interface Control with Ultrasound

This research aims at developing a novel production method of metal matrix compositesin which fine ceramic particles are快速transferred into molten metal and uniformly dispersed instrengthened matrix, based on the interface control with ultrasound. Ultrasonic vibration，metal powder addition and electromagnetic stirring are applied as principal technologies to dissolvethe main difficulties in melt stirring process. Consequently他们的贡献improve the apparent wettabilityexothermic reaction due to aluminide formation and the microstructure of matrix duringsolidification. With addition of al_2_3 or sio_2 particles on a molten Al alloy surface，fundamental data regarding the particle transfer and the. in situ formation of reinforcements were在electromagnetic melt stirring. Following elemental knowledges，which are required to develop the novel liquid processing of MMC，were clarified through the present research (1) Establishment of particle transfer…models into molten matrix metal and primary crystalline phase: Theoretical and More models into molten matrix metal and primary crystalline phaseexperimental studies on the transfer models with spherical and blocky particles to molten metal andprimary crystalline phase.(2) Evaluation of fundamental incorporation process based on facecontrol with ultrasonic vibration - Effects of improved apparent wettability on the处理period and the particle dispersion in matrix. period and the particle dispersion in matrix. Effect of cooling rate on the solidified matrixmicrostructure and the particle punching-out by主要crystalline.(3) Influence of ultrasonicvibration on the intermetallic formation with exotherm （hybridization）dimension of primary intermetallic crystallines on the particle dispersion in matrix. Formation ofal_2_3 and/or mgal_2_4 phase through the addition of sio_2 particles on molten Al- mg alloy.(4)Influence of solid phase fraction in slurry on the particle transfer in electromagnetic meltstirring: Effect of solid phase fraction in composite slurry on the electromagnetically rotatingspeed Effect of cooling rate on the refinement of primary crystallines and the particle dispersion。less

This research aims at developing a novel production method of metal matrix composites, in which fine ceramic particles are rapidly transferred into molten metal and uniformly dispersed in strengthened matrix, based on the interface control with ultrasound. Ultrasonic vibration, metal powder addition and electromagnetic stirring are applied as principal technologies to dissolve the main difficulties in melt stirring process. Consequently, they contribute to improve the apparent wettability, the exothermic reaction due to aluminide formation and the microstructure of matrix during solidification. With addition of Al_2O_3 or SiO_2 particles on a molten Al alloy surface, fundamental data regarding the particle transfer and the. in situ formation of reinforcements were examined in electromagnetic melt stirring. Following elemental knowledges, which are required to develop the novel liquid processing of MMC, were clarified through the present research :(1) Establishment of particle transfer … More models into molten matrix metal and primary crystalline phase :・Theoretical and experimental studies on the transfer models with spherical and blocky particles to molten metal and primary crystalline phase.(2) Evaluation of fundamental incorporation process based on interface control with ultrasonic vibration :・Effects of improved apparent wettability on the processing period and the particle dispersion in matrix.・Effect of cooling rate on the solidified matrix microstructure and the particle punching-out by primary crystalline.(3) Influence of ultrasonic vibration on the intermetallic formation with exotherm (hybridization) :・Effect of quantity and dimension of primary intermetallic crystallines on the particle dispersion in matrix.・Formation of Al_2O_3 and/or MgAl_2O_4 phase through the addition of SiO_2 particles on molten Al-Mg alloy.(4) Influence of solid phase fraction in slurry on the particle transfer in electromagnetic melt stirring :・Effect of solid phase fraction in composite slurry on the electromagnetically rotating speed.・Effect of cooling rate on the refinement of primary crystallines and the particle dispersion. Less