CN101733393A - Method for preparing high-performance aluminum alloy accurate die casting - Google Patents

Abstract

The invention discloses a method for preparing a high-performance aluminum alloy, which is particularly suitable for the aluminum alloy prepared by a high-performance rare-earth aluminum alloy die-casting process method. The method is characterized in that: a heavy rare earth scandium element is used as a trace optimized element, and is added and optimized on the basis of a ZL205A high-strength aluminum alloy component so as to obtain a novel die-casting aluminum alloy material. The method can obviously improve the tensile strength of the die-casting aluminum alloy, modify and refine structures, improve heat resistance and elongation, and reduce properties of thermal expansion systems and the like, wherein the tensile strength can be improved by 30 percent; and the elongation can be improved by over twice.

Description

A kind of method for preparing high-performance aluminum alloy accurate die casting

Affiliated technical field

The present invention relates to a kind of high-performance aluminium alloy manufacture method, especially be applicable to high-performance rare-earth aluminium alloy compression casting process aluminium alloy.

Background technology

Current, Al-alloy parts is widely used, but conventional Al-alloy parts also exists defectives such as intensity is low, mechanical performance is not high, corrosion-resistant, resistance to elevated temperatures difference, for the more application of high strength requirement is arranged, then can't use pack alloy because of the performance limitations of its die casting material.

Summary of the invention

For solving the problem that pack alloy exists, we adopt heavy rare earth scandium element to optimize element as trace, carrying out adding micro-scandium on the pack alloy composition basis on the ZL205A material basis, thereby obtain new aluminum alloy material, again by microdiecast technology, thereby obtain the high-performance aluminum alloy accurate die casting product.

The invention has the beneficial effects as follows, significantly improve tensile strength, modifying-refining tissue, raising hear resistance, the percentage elongation of pack alloy, reduce characteristics such as hot expansion system.Tensile strength tensile strength (σ b) 〉=460MPa wherein; Percentage elongation (δ 5) 〉=6%; Brinell hardness (HBS) 〉=110.

Description of drawings

Accompanying drawing is that high-performance aluminum alloy accurate die casting of the present invention prepares schematic diagram.

The specific embodiment

As shown in the figure:

1, earlier the ZL205A raw and auxiliary material is carried out melting, smelting temperature reaches 650 ℃-700 ℃.

2, carry out PROCESS FOR TREATMENT such as necessary slagging-off, exhaust according to conventional aluminium alloy compression casting smelting technology.

3, the scandium aluminium intermediate alloy is deposited on the aluminium alloy liquid level, the position of stacking uses graphite bell jar (iron bell jar) to be pressed in the aluminium alloy melt near equal 15cm place, furnace wall then, and slowly stirs along even all around near 10cm-15cm place, furnace wall.

4, the scandium addition is by the 0.25%-0.45% proportioning of gross weight.

Si≤0.06; Cu:4.6-5.3; Mg≤0.05; Zn≤0.25; Mn:0.3-0.5; Ti:0.15-0.35; Zr:0.05-0.20; Cd≤0.25; B :≤0.06; V≤0.30; Sc:0.25-0.45; Other impurity≤0.3; Surplus: Al

5, be warming up to 750 ℃-800 ℃ and carry out modification process, left standstill 2-4 hour after going bad.

6, can't use conventional pressure casting method at silicone content in the new material of ZL205A modified is low, by increasing running channel, setting up way development of new die castings such as steam vent and dirt-excluding groove, and rationally control die-casting technological parameter, improve cast temperature more than 30 ℃, thereby realize the microdiecast of ZL205A type material, preparation has high strength, height is heat-resisting and the aluminum alloy accurate die casting of high rigidity.

Claims (4)

1. a high-performance aluminium alloy die-casting process method is characterized in that obtaining a kind of high-performance aluminium alloy material by adding heavy rare earth scandium element, obtains high-performance low silicon aluminum foundry goods by die-casting process method again.

2. pack alloy process according to claim 1 is characterized in that, during the high-performance aluminium alloy melting, adds scandium aluminium intermediate in ZL205A raw and auxiliary material liquation, and control scandium addition is by the 0.25%-0.45% proportioning of gross weight.

Si≤0.06; Cu:4.6-5.3; Mg≤0.05; Zn≤0.25; Mn:0.3-0.5; Ti:0.15-0.35; Zr:0.05-0.20; Cd≤0.25; B :≤0.06; V≤0.30; Sc:0.25-0.45; Other impurity≤0.3; Surplus: Al

3. high-performance aluminium alloy die-casting process method according to claim 1 is characterized in that, behind the adding scandium element, is warming up to 750 ℃-800 ℃ and carries out modification process, leaves standstill 2-4 hour after going bad.

4. high-performance aluminium alloy die-casting process method according to claim 1, it is characterized in that, can't use conventional pressure casting method at silicone content in the new material of ZL205A modified is low, by increasing running channel, setting up way development of new die castings such as steam vent and dirt-excluding groove, and rationally control die-casting technological parameter, improve cast temperature more than 30 ℃, thereby realize the microdiecast of ZL205A type material, preparation has high strength, height is heat-resisting and the aluminum alloy accurate die casting of high rigidity.

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