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Preparation of Al2O3p/Al-Cu Matrix Semi-solid Billet

Author: GeRiLe
Tutor: LiuHuiMin
School: Inner Mongolia University of Technology
Course: Materials Science
Keywords: Semi - solid billet Situ Al2O3 particles Near-liquidus casting Microstructure
CLC: TG24
Type: Master's thesis
Year: 2009
Downloads: 41
Quote: 0
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Abstract


Situ reactive near-liquidus casting method situ reactive near-liquidus casting method combined with the formation of a new method for the preparation of semi - solid billet , it particles generated in the alloy melt semi-solid billet of the alloy phase diagram, in the near liquidus temperature casting, to obtain a novel method meet the the thixoforming process requirements of the semi-solid blank , it has the advantage in that the pollution - free surface of the particles in situ in the matrix evenly distributed near liquidus temperature casting can inhibit the formation of dendrites organization formed small rose -like organization , and the process is simple , high production efficiency, the applicable alloy varieties . In this paper, in situ reactive near-liquidus casting method , prepared the Al 2 O 3 < / sub > P / Al -Cu -based and Al 2 O < sub> 3 P / Al-Cu-Si -based semi- solid billet research preparation process parameters investigated by optical microscopy , transmission electron microscopy , X -ray diffraction of the prepared Al of 2 < / sub> O 3 P / Al-Cu -based semi- solid billet microstructure . Through experimental observation and theoretical analysis to the following conclusions: the adiabatic temperature of the reaction to the high amount of diluent from the low amount of diluent , the side of the high preheating temperature side of the low preheat temperature is reduced; using magnesium powder do igniting agent , with magnesium the reduction in the amount of the powder , the reaction induction time . When situ Al 2 O 3 particle content of 5.3 wt % , the melt temperature of 850 ° C , prefabricated blocks of quality ingredients Al : of CuO = 1:1 . added 1 / 1200 of the total mass of the prefabricated blocks Mg powder reaction is carried out smoothly and does not produce an explosion phenomenon . Al 2 ! O 3 P / Al - Cu -Si semi - solid billet reactant ratio of Al: CuO: SiO 2 = 2: 3:2, and the initiator in the amount of magnesium to the precast block is 1/300 of the total mass , the aluminum melt temperature reaches 950 ° C when the reaction was carried out completely . Situ Al 2 O 3 particle size diameter of less than 0.5μm, dispersed in a matrix , and the interface is clean , non-polluting ; amount of added along with the in situ reactants increase generated Al 2 O 3 particles increased , but at the same time generate an alloy of elemental copper was also significantly increased with increasing content of of CuAl 2 < / sub> in the reticular distribution of grains around .

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