CN102482738A

CN102482738A - Method For Producing An Aluminum-magnesium-based High-strength Alloy

Info

Publication number: CN102482738A
Application number: CN2010800345878A
Authority: CN
Inventors: 崔洪鑫; 崔云珠
Original assignee: SLM CO Ltd [KR]
Current assignee: SLM CO Ltd [KR]
Priority date: 2009-09-28
Filing date: 2010-09-20
Publication date: 2012-05-30
Also published as: WO2011037398A3; WO2011037398A2; JP2013501854A; KR100978558B1

Abstract

The present invention relates to an Al-Mg-based high-strength alloy comprising 9 to 18 wt % of Mg, Al, and a small amount of Si, Fe, Mn and Ti. The alloy of the present invention has been developed to be used as a material for components of vehicles, bicycles and electronic devices, and as a material for cases for portable communication equipment. The alloy of the present invention can be made into the abovementioned products such that the latter are lightweight have a high strength.

Description

The method of manufacture of HS aluminum-magnesium series alloy

Technical field

The present invention relates to a kind of lightweight high-intensity Al-Mg is alloy.

Recently, be applicable to that the alloy material of auto parts, attachments of a bicycle, electrical/electronic part and robot etc. is asked to possess the light high-intensity characteristic, people have dropped into great effort to the research and development of aforementioned alloy material.

Technical field of the present invention belongs to above-mentioned ultralight amount and HS Al-Mg is an alloy.

Background technology

As typical A l-Mg is alloy, and Hydronalium (Hydronalium) has not only possessed excellent solidity to corrosion, intensity, unit elongation at the Mg that contains on the Al about 5-8wt%, and proportion is little, and machinability is also good.

Above-mentioned Hydronalium (Hydronalium) is a kind ofly to carry out αGu Rongti and β (Al mutually at 450 ℃ ₃Mg ₂Phase) alloy of coexistence operation, segregation more extensively and easily appears in the solidification temperature range of this alloy, and higher in pyritous Mg solid solubility, therefore need be 400 ℃ of thermal treatments of annealing to improve intensity and unit elongation.

In addition; Al-Mg is the easy oxidation of molten soup of alloy; Mg is the strong reducing property metallic element; Can cause the so-called casting mold reaction (Metal-mold reaction) that absorbs hydrogen (H) when contacting and form bubble with airborne hydrogen (H), to need to add a small amount of Be in order preventing and to prevent alloy oxidation on the castings surface.

And, can obtain certain effect when after molding sand is sneaked into the ammonium borofluoride things such as (ammonium fluoroborate) about 2%, processing model.

Yet; Though being alloy, Al-Mg can process the light high-intensity alloy above 8% o'clock at Mg content; But the amount of oxidation of the high more molten soup of Mg content is with to inhale hydrogen (H) amount many more, thereby becomes the reason that causes the alloy surface bubble, so the alloy that Mg content surpasses 8%wt does not possess economy; Difficulty during manufacturing is also high, can't obtain widespread use.

Summary of the invention

Invention needs the technical task of solution

The purpose of this invention is to provide and a kind ofly contain 9 to 18wt% Mg and add the Al-Mg series high strength alloy of a small amount of Si, Fe, Mn and Ti at Al; It is light weight and have good weldableness and the surface is beautiful not only, is suitable as the material of vapour spare, bike, electronic product and portable communications equipped case etc.

Solve the technical scheme of problem

When the molten soup of Al drops into more Mg, can be because Mg oxidation and can't be at the residual Mg of Al matrix organization.

The present invention uses graphite (graphite) crucible to be heated to 600-700 ℃ to Al and processes and drop into solvent (FLUX) after the molten soup of Al and form the oxidation shielding film on the molten soup of Al surface, then toward the following input Mg on the molten soup of Al surface and develop the high Al alloy of Mg content through the fusion that prevents the Mg oxidation.

Beneficial effect

As previously mentioned; Be that alloy contains 9 to 18wt% Mg and develop HS ultralight amount Al-Mg at Al-Mg be alloy material, can be widely used in part, electric appliance and electronic part, robot part and portable communications equipment and so on shells such as the automobile that must possess the ultra lightweighting characteristic and bicycle frame etc.

Embodiment

The Al-Mg that the present invention relates to a kind of Mg of containing 9-18wt%, Si 0.1-0.3wt%, Fe 0.1-0.2wt%, Mn0.3-1.0wt%, Ti 0.15-0.25wt% is an alloy, and it is high for intensity and surface hardness, weight is light about the 2 times super light material of alloy than existing Al-Mg also.

Specifying Al-Mg of the present invention below in conjunction with embodiment is alloy.

(embodiment)

Al 82.9Kg, Si 0.2Kg, Fe 0.2Kg, Mn 0.5Kg, Ti 0.2Kg drop into plumbago crucible and be heated to 600-700 ℃ give fusion after, drop into solvent (FLUX) in the crucible and form the Flux layer that prevents film as oxidation on molten soup surface.

The product that above-mentioned solvent has used the non-ferrous metal fusion to use often.

Afterwards, drop into Mg 16Kg and keep back casting about 0.5-1 hour at 600-700 ℃ to forming in the molten soup that aerobicization prevents layer through long tube, process strength trial then and experimentize with after 2 of the test pieces, table 1 is its result.

Table 1 mechanical properties

Classification	Tensile strength Kgf/mm ²	Hardness (HB)	The weight ratio of unit volume
				The present invention	40	100	0.2
Existing Al-Mg (alloy)	32	65	1

Shown in above-mentioned table 1, the existing Al-Mg of tensile strength and hardness ratio is that alloy has improved about 30-40%, and the weight of unit volume has also alleviated about 1.8 times.

In addition, the restriction of alloy composition ratio of the present invention the reasons are as follows.

①Mg：9-18wt％

Metallic element Mg not only improves the intensity of Al alloy, and dimensional change is less in the process of setting after casting, and weight is lighter, and castibility and machinability, impelling strength and weldableness are all good.

Intensity can reduce when Mg was lower than 9wt%, can be when rolling or extruding when Mg surpasses 18wt% the edge section be destroyed easily and reduce its processibility and productivity.

And; The meeting of stacking fault energy (Stacking fault energy) value reduced and increases the distance between the partial dislocation when Mg content surpassed 18wt%, thereby strengthened stacking fault (Stacking fault) field of alloy substrate tissue and cause taking place on the alloy surface micro bubble.

②Si：0.1-0.3wt％

The Si element is used the back to improve the fatigue strength and the wear resistance of Al alloy by Al matrix (matrix).

Bring into play effect when its content is lower than 0.1wt% hardly, separate out thick Si particle when surpassing 0.3wt% and reduce processibility.

③Fe：0.1-0.3wt％

The Fe element goes out and improves the wear resistance of Al alloy with the intermetallic compound crystalline substance at the Al alloy.

When being lower than 0.1wt%, its content almost do not have wear-resisting effect, thickization of particle when surpassing 0.3wt% and reduce processibility.

④Mn?0.3-1.0wt％

Metallic element Mn makes the Mg based compound to separate out equably, and when the moulding post-heating, improves intensity, is the metallic element that needs when obtaining the fine crystalline grain.

Do not occur above-mentioned effect when its content is lower than 0.3wt%, form thick intermetallic compound when surpassing 1.0wt% and reduce unit elongation, thereby reduce toughness.

Therefore the compositing range of Mn is set at 0.3-1.0wt%.

⑤Ti：0.15-0.25wt％

The Ti element can make the particle miniaturization, is the element that needs when further improving the intensity of Al alloy.

Its content forms thick intermetallic compound when surpassing 0.25wt% and reduces formability (processibility), can not help the raising of alloy strength when being lower than 0.15wt%.

Claims

1. the method for manufacture of a HS aluminium-magnesium alloy, this alloy comprises Mg 9-18wt%, Si0.1-0.3wt%, Fe 0.1-0.3wt%, Mn 0.3-1.0wt%, Ti 0.15-0.25wt%, and surplus is Al, it is characterized in that:

Drop into the plumbago crucible post-heating to the alloy beyond the above-mentioned Mg and process molten soup to 600-700 ℃,

Drop into solvent (FLUX) and melting the surperficial solvent layer (FLUX) that prevents layer as oxidation that forms of soup at above-mentioned molten soup,

Through long tube to be formed with drop in the molten soup that above-mentioned oxidation prevents layer Mg and 600-700 ℃ keep 0.5-1 hour after casting, naturally cooling then.