CN103374676A - High-strength aluminum alloy and preparation method thereof - Google Patents

Abstract

The invention relates to a high-strength aluminum alloy. The alloy comprises the following components in percentage by weight: 6-12.5% of Zn, 1-2% of Mg, at most 3% of Cu, 0.4-0.6% of Zr, 0.001-0.02% of Mn, 0.05-1.5% of Sc, the balance of Al, and at most 0.2% of other elements and impurities generated under the manufacturing conditions. Preferably, the high-strength aluminum alloy further further comprises more than 0.02% and less than 0.03% of titanium by mass. The invention further provides a preparation method of the aluminum alloy. The preparation method comprises the steps of melting in a smelting furnace, oxidizing, deoxygenating, impurity removal, slagging, pouring and the like. The aluminum alloy prepared by adopting the scheme has the characteristics of high strength and toughness and can be applied to the special environment of space flight and aviation and the like.

Description

A kind of aldural and preparation method thereof

Technical field

The present invention relates to the alloy field, especially relate to a kind of aldural, also comprise the preparation method of described aluminium alloy.

Background technology

Aldural is a class high-performance aluminium alloy of developing take aerospace applications as background the sixties in 20th century, have light weight, high-strength, high-ductility and the series of advantages such as low-cost, the fields such as widespread use and aviation, communications and transportation, naval vessels and weapons, have high using value, be subject to the great attention of various countries.。

Summary of the invention

The purpose of this invention is to provide a kind of aldural, also comprise the preparation method of described aluminium alloy.

For realizing above-mentioned goal of the invention, technical scheme of the present invention is as follows:

A kind of aldural, described alloy comprise (in quality %):

The Zn of 6-12.5%,

The Mg of 1-2%,

Maximum 3% Cu,

The Zr of 0.4-0.6%,

The Mn of 0.001-0.02%,

The Sc of 0.05-1.5%,

Surplus is Al, and other element of the highest 0.2% and the lower generation impurity of creating conditions.

Preferably, also comprise by mass at the titanium below 0.03% more than 0.02%.

The preparation method of above-mentioned aluminium alloy:

(1) according to the prescription batching;

The material that (2) will prepare drops into fusing in the smelting furnace;

(3) add oxygenant;

(4) add reductive agent;

(5) basic slag that adds lime and fluorite composition carries out deoxidation, decon;

(6) add the basic slag slag making;

(7) drop into the aluminium material, stir, remove slag, casting, the setting rate of the aluminium alloy solution of casting is greater than 110 ℃/second.

Preferably, also comprise the aluminum alloy casting that solidifies is carried out solution heat treatment and timeliness thermal treatment.

The application of above-mentioned aluminium alloy in section bar, machinework.

The invention has the beneficial effects as follows: the aluminium alloy that uses the solution of the present invention to prepare, have intensity height, characteristics that toughness is high, can be applied to the particular surroundingss such as space flight and aviation.

Embodiment

Below in conjunction with embodiment, to details are as follows according to embodiment provided by the invention:

Embodiment 1

6% Zn,

The Mg of %,

1% Cu,

0.4% Zr,

0.001 Mn,

0.05% Sc, surplus is Al, above per-cent is weight percentage.

Embodiment 2

12.5% Zn,

2% Mg,

3% Cu,

0.6% Zr,

0.02% Mn,

1.5% Sc, surplus is Al, above per-cent is weight percentage.

Embodiment 3

7% Zn,

1.5% Mg,

1.5% Cu,

0.5% Zr,

0.0015% Mn,

1.0% Sc,

0.025% Ti, surplus is Al, above per-cent is weight percentage.

Embodiment 4

Be prepared according to embodiment 3 described proportionings, the preparation method is as follows:

The material that (1) will prepare drops into intermediate frequency furnace, and the energising heating makes material melting;

(2) pass into oxygen and carry out oxidation;

(3) add carbide of calcium and carry out deoxidation, deaeration time 4-5 minute;

(4) basic slag that adds lime and fluorite composition carries out deoxidation, and the ratio of lime and fluorite is 7: 3;

(5) add the silicon ground caustic and carry out diffusive deoxidation, time 5-6 minute;

(6) input is preheated to 200-260 ℃ aluminium material, melts about 10 minutes, stirs, and drags for removing dross, treats that solution temperature is to prepare casting about 1200-1250 ℃.With greater than the cooling of 110 ℃/second speed, crystallization, described casting process is non-open type casting to aluminium alloy solution, treats the cooling of can unpacking when alloy temperature is down to below 300 ℃ in mould.

(7) then, the aluminum alloy casting that solidifies is carried out solution heat treatment and timeliness thermal treatment, to improve intensity and the toughness of aluminium alloy.

Claims (5)

1. aldural, it is characterized in that: described alloy comprises (in quality %):

The Zn of 6-12.5%,

The Mg of 1-2%,

Maximum 3% Cu,

The Zr of 0.4-0.6%,

The Mn of 0.001-0.02%,

The Sc of 0.05-1.5%,

Surplus is Al, and other element of the highest 0.2% and the lower generation impurity of creating conditions.

2. aldural according to claim 1 is characterized in that: also comprise by mass at the titanium below 0.03% more than 0.02%.

3. the preparation method of each described aluminium alloy according to claim 1-2:

(1) according to the prescription batching;

The material that (2) will prepare drops into fusing in the smelting furnace;

(3) add oxygenant;

(4) add reductive agent;

(5) basic slag that adds lime and fluorite composition carries out deoxidation, decon;

(6) add the basic slag slag making;

(7) drop into the aluminium material, stir, remove slag, casting, the setting rate of the aluminium alloy solution of casting is greater than 110 ℃/second.

4. preparation method according to claim 3 also comprises the aluminum alloy casting that solidifies is carried out solution heat treatment and timeliness thermal treatment.

5. each described aluminium alloy application in section bar, machinework of claim 1-2.