Planar semifinished product of aluminum alloy matrix composite having boron carbide-particles, useful for manufacturing a plate, comprises boron carbide particles-containing layers, and a matrix-forming aluminum alloy comprising silicon

摘要

Planar semifinished product (1) made of an aluminum alloy matrix composite having boron carbide-particles, comprises a first layer having a proportion of boron carbide particles on a first surface (2), which optionally increases the proportion of boron carbide-particles of a second layer, which is present on a second surface (3) facing away from the first surface, where a matrix-forming aluminum alloy of the aluminum alloy matrix composite comprises a total content of 10-40 wt.% silicon. Independent claims are also included for: (1) manufacturing the planar semifinished product, comprising (a) preparing the aluminum alloy matrix composite with the boron carbide-particles in the matrix-forming aluminum alloy, (b) heating the aluminum alloy matrix composite at a liquidus temperature of the matrix-forming aluminum alloy and melting the aluminum alloy under a protective gas atmosphere in a horizontally aligned melting mold (5), which corresponds to a contour provided for the area of the semifinished product in a pressure chamber (7), (c) establishing a gas pressure of 1100-1300 bar, preferably 1200 bar in the pressure chamber and subjecting the aluminum alloy matrix composite to the gas pressure, which is heated above the liquidus temperature, (d) generating vibrations through a vibrating source and initiating the vibrations in the melting mold, allowing the vibration on the melt of the matrix-forming aluminum alloy over a period of time, by reducing the viscosity of the melt and assembling the boron carbide-particles in the opposite direction to gravity, (e) enriching the boron carbide-particles in the first layer on the first surface of the melt present in the melting mold and enriching the second layer of boron carbide-particles located below the first layer, (f) cooling the melt in the melting mold in the pressure chamber to a solidus temperature and solidifying the planar semifinished product with the layer enriched with boron carbide-particles, and (g) demolding the planar semifinished product and quenching; and (2) manufacturing a plate from the planar semifinished product, comprising (i) carrying out a machined-editing of the semifinished product, removing the layer depleted of boron carbide-particles and obtaining the layer as the plate, which is enriched with boron carbide-particles, and (ii) optionally massively reshaping the plate by repeatedly rolling at 525-550[deg] C to achieve a plate thickness of 0.5-2.5 mm.