High strength and ductility high-silicon aluminum alloy suitable for squeeze casting and preparation process of high strength and ductility high-silicon aluminum alloy

Abstract

The invention discloses a high strength and ductility high-silicon aluminum alloy suitable for squeeze casting and a preparation process of the high strength and ductility high-silicon aluminum alloy.Components of the high strength and ductility high-silicon aluminum alloy comprise, by weight percent, 17%-23% of Si, 0.5%-1% of Cu, 0.3%-0.8% of Mg, 0.2%-0.5% of Fe, 0.5%-0.8% of Mn, 0.2%-0.6% of RE, 0.05%-0.1% of P, 0.3% of other microelements such as Cr and Ti and the balance Al. The high-silicon aluminum alloy has an excellent metallographic structure and can be suitable for manufacturing high-strength aluminum alloy structure parts needing to bear heavy loads; a high-silicon aluminum alloy product has excellent mechanical performance; the heat treatment procedure is omitted; energy consumption is reduced; the production efficiency is high; and the production cost is saved.

Description

technical field [0001] The invention relates to the field of preparation of high-silicon aluminum alloy products, in particular to a preparation process of high-strength and high-silicon aluminum alloy suitable for extrusion casting. Background technique [0002] High-silicon aluminum alloy has the characteristics of small thermal expansion coefficient, high hardness, high strength, good wear resistance and low density, which can well meet modern environmental protection requirements and improve energy consumption problems, and is widely used in brake discs, cylinder liners, pistons and other parts. The mechanical properties of high-silicon aluminum alloys directly depend on the morphology, grain size, distribution of the Si phase, the growth mode of the Al matrix, and the fracture characteristics of the Si phase itself. The coarse primary Si and long acicular Si in the structure The eutectic Si severely splits the continuity of the aluminum matrix, thus limiting the applic...

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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a high-strength and tough high-silicon aluminum alloy with simple molding, small thermal expansion coefficient, and small Si phase grain size and its preparation process for the insufficient strength of high-silicon aluminum alloy products

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