CN102703774A

CN102703774A - Cast aluminum alloy

Info

Publication number: CN102703774A
Application number: CN2012102151134A
Authority: CN
Inventors: 罗永明; 张金川
Original assignee: GUIYANG HUAFENG COLORED CASTING CO Ltd
Current assignee: GUIYANG HUAFENG COLORED CASTING CO Ltd
Priority date: 2012-06-27
Filing date: 2012-06-27
Publication date: 2012-10-03

Abstract

The invention discloses a cast aluminum alloy material. The alloy is characterized by comprising the following components in percentage by weight: 1.5 to 2.5 percent of Cu, 9.6 to 12.0 percent of Si, 0.22 to 0.27 percent of Mg, less than or equal to 1.5 percent of Zn, less than or equal to 0.6 percent of Fe, less than or equal to 0.5 percent of Mn, and the balance of Al and inevitable impurities. By controlling the Mg content of the aluminum alloy, the hardness of the material is improved; and smoothness and size precision of pores are high after a casting cast by using the material is machined.

Description

A kind of y alloy y

Technical field

The present invention relates to a kind of al alloy component, especially the content of Mg in the duraluminum.

Background technology

The aluminum alloy casting chemical ingredients also contains a large amount of trace elements except principal element.In process of production, the use of trace element is usually out in the cold, causes casting quality not to be greatly improved.Traditional concept thinks, as long as the foundry goods principal element is qualified, trace element is controlled within the standard range, and the quality of materials of foundry goods does not just have problem, but in fact the quality used of trace element has very big influence to the lifting of quality product.

The hardness of common aluminum alloy is lower; When the needs casting part that some shapes are special and dimension precision requirement is higher; Though HB HB, tensile strength, elongation etc. can satisfy the standard-required of part; But after casting drops into later stage mechanical workout, can find situation such as turn white in the surface, the hole is overproof, process luminosity, dimensional precision can not guarantee to occur after the processing of hole in piece part and end face, thereby produce a large amount of waste products.Through analyzing casting hardness is the major cause that causes this kind situation to produce inadequately.At present the content of Mg in the foundry goods is not done most requirement, as long as be controlled at≤0.5% just reach the alloying constituent requirement that the client provides.

Summary of the invention

The technical problem that the present invention will solve is: the low situation of casting hardness to present common aluminum alloy material casting provides a kind of higher high hardness aluminium alloy material of having of usefulness of casting.

Technical scheme of the present invention:

By element wt per-cent, the composition of this y alloy y is Cu:1.5 ~ 2.5%, Si:9.6 ~ 12.0%, and Mg:0.22 ~ 0.27%, Zn :≤1.5%, Fe :≤0.6%, Mn :≤0.5%, all the other are Al and unavoidable impurities.

Beneficial effect of the present invention: through repeatedly experiment repeatedly, can effectively improve casting hardness between Mg content is controlled at 0.22 ~ 0.27%, foundry goods measuring mechanical property after timeliness is: 1. HB HB: 89 2. tensile strength: 286MPa is elongation 3.: 2.3%.Each item index is all compared the common aluminum alloy foundry goods and is obtained bigger raising.Foundry goods is high through the luminosity and the dimensional precision of mechanical workout metapore.

Embodiment:

A kind of auto parts, its mechanical property requires: 1. HB HB >=70,2. tensile strength >=250Mpa, 3. elongation >=2%; The casting of employing common aluminum alloy, by mass percentage, alloying constituent is: Cu:1.9%; Si:11.3%, Mg:0.07%, Zn:0.6%; Fe:0.45%, Mn:0.32%, all the other are Al and impurity.The foundry goods of producing is after artificial aging: 1. HB HB: 75, and 2. tensile strength: 261Mpa, 3. elongation: 2.2%

Above index all satisfies the performance index requirement of part, but after dropping into later stage mechanical workout, finds situation such as turn white in the surface, the hole is overproof, process luminosity, dimensional precision can not guarantee to occur after the hole in piece part processing, has produced a large amount of waste products.

Through repeatedly experiment, on the basis of above alloying constituent, Mg content is controlled between 0.22 ~ 0.27%, the foundry goods mechanical property through test is: 1. HB HB: 89,2. tensile strength: 286Mpa, 3. elongation: 2.3%.Each item index all obtains bigger raising.The adjusted foundry goods of Mg content all can satisfy drawing requirement through the luminosity and the size of mechanical workout metapore.Be lower than at 0.22% o'clock through experiment Mg content simultaneously, inoperative basically to the change of casting hardness.Mg content is higher than at 0.3% o'clock, and the risk of casting thermal fragmentation is bigger in the time of the foundry goods cool quickly.

Claims

1. cast aluminium alloy material, it is characterized in that: by element wt per-cent, this alloying constituent is Cu:1.5 ~ 2.5%; Si:9.6 ~ 12.0%, Mg:0.22 ~ 0.27%, Zn :≤1.5%; Fe :≤0.6%, Mn :≤0.5%, all the other are Al and unavoidable impurities.