CN101368240A

CN101368240A - Novel aluminum alloy

Info

Publication number: CN101368240A
Application number: CNA2008101393483A
Authority: CN
Inventors: 吴致芳
Original assignee: China Wheel Co Ltd Taian
Current assignee: China Wheel Co Ltd Taian
Priority date: 2008-08-28
Filing date: 2008-08-28
Publication date: 2009-02-18

Abstract

The invention relates to a novel aluminum alloy; the content of Si in the aluminum alloy is adjusted, based on the aluminum alloy A356.2; the chemical components thereof are as follows: larger than 7.5 to 8.2 percent of Si, 0.28 to 0.45 percent of Mg, 0.08 to 0.20 percent of Ti, not larger than 0.12 percent of Fe, not larger than 0.01 percent of Cu, not larger than 0.01 percent of Zn, not larger than 0.05 percent of Mn, not larger than 0.05 percent of Zr, not larger than 0.01 percent of Ni, not larger than 0.01 percent of Sn, not larger than 0.10 percent of microelements and the rest is Al. In the invention, as the content of Si in the aluminum alloy is properly added, the novel aluminum alloy can optimize the matching between the anti-tension intensity and the extending rate of the aluminum alloy, increase the anti-impact performance of the product and simultaneously improve the casting fluidity of the aluminum alloy and effectively reduce the casting defect; therefore, the novel aluminum alloy has the characteristics of optimizing the matching between the anti-tension intensity and the extending rate of the aluminum alloy, increasing the anti-impact performance of the product, improving the casting fluidity, avoiding casting defect, improving the product quality, and the like.

Description

A kind of new aluminium alloy

One, technical field:

The present invention relates to a kind of new aluminium alloy, specifically a kind of new aluminum alloy materials that is mainly used in automotive hub, but also it is used.

Two, background technology:

Along with developing rapidly of Domestic Automotive Industry, improving constantly of people's living standard, increasing to the demand of automobile, more and more higher to the requirement of automotive performance, running safety energy particularly.Automotive hub is the important stressed member of running car, and the driving safety of automobile is had vital role.The material that is used to produce aluminium alloy wheel hub of vehicle at present mainly is aluminium alloy A356.2, its chemical ingredients is: Si:6.5～7.5%, Mg:0.28～0.45%, Ti:0.08～0.20.%, Fe: ≯ 0.12%, Cu: ≯ 0.01%, Zn: ≯ 0.01%, Mn: ≯ 0.05%, Zr: ≯ 0.05%, Ni: ≯ 0.01%, Sn: ≯ 0.01%; Other trace element ≯ 0.10%.This alloy exists following shortcoming: its tensile strength and unit elongation are lower, and flowability is relatively poor when Foundry Production, easily cause casting flaw.Thereby influenced the use properties of wheel hub.

Three, summary of the invention

The purpose of this invention is to provide a kind of new aluminium alloy, the combination of its tensile strength and unit elongation obtains reasonably optimizing, and casting fluidity is good, can avoid casting flaw, the quality that improved product.

For achieving the above object, the technical scheme that the present invention takes is: be on the basis of aluminium alloy A356.2, the content of Si in the aluminium alloy is adjusted, be that its chemical ingredients proportioning is: Si:〉7.5～8.2%, Mg:0.28～0.45%, Ti:0.08～0.20.%, Fe: ≯ 0.12%, Cu: ≯ 0.01%, Zn: ≯ 0.01%, Mn: ≯ 0.05%, Zr: ≯ 0.05%, Ni: ≯ 0.01%, Sn: ≯ 0.01%; Other trace element ≯ 0.10%, all the other are Al.

The present invention is that the content with Si among the aluminium alloy A356.2 is increased to by 6.5～7.5%〉7.5～8.2%, the content of other element is constant.Si is the main component of aluminium alloy A356.2.Si forms the Mg2Si (Mg2Si is strengthening phase in aluminium alloy) with Mg except that dissolving on a small quantity in α-Al sosoloid neutralization in aluminium alloy, and remaining Si forms silicon crystal, i.e. silicon eutectic (also being referred to as the superfluous phase of silicon).The silicon eutectic is distributed in around the dendritic crystal of α-Al, and existence form has needle-like, stratiform, shaft-like, vermiform, granular, fibrous etc. or these mixture.The content of Si is lower among the aluminium alloy A356.2, and its improvement to aluminium alloy tensile strength, unit elongation and casting fluidity is limited, can not satisfy the requirement more and more higher to automotive hub.The raising that the present invention is suitable the content of Si in the aluminium alloy, tensile strength and unit elongation that it can optimize aluminium alloy accordingly cooperate, and improve the shock-resistance of product, satisfy the requirement more and more higher to automotive hub.Improve the casting fluidity of aluminium alloy simultaneously, reduced casting flaw effectively.Therefore, the present invention has the tensile strength of having optimized aluminium alloy and the cooperation of unit elongation, improves the shock-resistance of product; Improved casting fluidity, can avoid casting flaw, the characteristics such as quality that improved product.

Four, embodiment

Present embodiment is on the basis of primary aluminum alloy A 356.2, and the content of the Si in the aluminium alloy is adjusted, and the content of Si in the aluminium alloy is increased to by 6.5～7.5%〉7.5～8.2%, other element is constant.The chemical ingredients proportioning that is present embodiment is Si:〉7.5～8.2%, Mg:0.28～0.45%, Ti:0.08～0.20.%, Fe: ≯ 0.12%, Cu: ≯ 0.01%, Zn: ≯ 0.01%, Mn: ≯ 0.05%, Zr: ≯ 0.05%, Ni: ≯ 0.01%, Sn: ≯ 0.01%; Other trace element ≯ 0.10%, all the other are Al.

Since the suitable increase of the present invention the content of Si in the aluminium alloy, it can optimize the tensile strength of aluminium alloy and the cooperation of unit elongation accordingly, improves the shock-resistance of product, has improved the casting fluidity of aluminium alloy simultaneously, has reduced casting flaw effectively.Through test, the shock-resistance of the automotive hub of being produced by the present invention has improved about 30%, satisfies the requirement more and more higher to automotive hub.Therefore, the present invention has the tensile strength of having optimized aluminium alloy and the cooperation of unit elongation, improves the shock-resistance of product; Improved casting fluidity, can avoid casting flaw, the characteristics such as quality that improved product.

Claims

1. new aluminium alloy, it is characterized in that: the chemical ingredients proportioning is: Si: 7.5～8.2%, Mg:0.28～0.45%, Ti:0.08～0.20.%, Fe: ≯ 0.12%, Cu: ≯ 0.01%, Zn: ≯ 0.01%, Mn: ≯ 0.05%, Zr: ≯ 0.05%, Ni: ≯ 0.01%, Sn: ≯ 0.01%, other trace element ≯ 0.10%, all the other are Al.