TWM592442U - Alloy structure with surface of low magnesium content - Google Patents

Abstract

The present invention discloses an alloy structure with a low magnesium content surface, which includes an alloy layer with raw magnesium content and a magnesium-depleted layer formed outside the alloy layer with raw magnesium content. Wherein, the magnesium-depleted layer has a surface with low magnesium content, which can strengthen the weldability of the alloy and improve the yield of the joint.

Description

Alloy structure with low magnesium content

This creation relates to alloy structures, specifically to alloy structures with surfaces with low magnesium content.

Aluminum alloy is the most widely used metal material in the industry. Aluminum alloy has the advantages of low density, high strength, high thermal conductivity, and good processing performance. With the application of aluminum alloys in aerospace, automotive, machinery manufacturing, etc., the requirements for aluminum alloy welding performance continue to increase, and the quality of the welding will directly affect the use of parts.

The main element that strengthens aluminum alloys is magnesium (Mg). However, the excessively high magnesium content in aluminum alloys may be one of the reasons for poor welding, and it is difficult to guarantee the yield of joints.

In view of this, the inventor of this creation has been engaged in the development and design of related products for many years, and feels that the above-mentioned deficiencies can be improved. It is especially dedicated to research and cooperate with the application of academic principles. Finally, he proposes a reasonable design and effectively improves the above-mentioned deficiencies. .

The main purpose of this creation is to provide an alloy structure with a low magnesium content surface to solve the above problems.

In order to solve the above technical problems, a technical solution adopted in this work is to provide an alloy structure with a low magnesium content surface, including: an alloy layer with raw magnesium content and an alloy formed on the magnesium content A magnesium-depleted layer outside the layer; wherein the magnesium-depleted layer has a surface with a low magnesium content.

In a preferred embodiment, the thickness of the magnesium-depleted layer is at least greater than 10 μm.

In a preferred embodiment, the magnesium-depleted layer and the alloy layer with raw magnesium content are made of an aluminum alloy containing magnesium, and the magnesium layer with magnesium content less than the alloy layer with raw magnesium content Of magnesium.

In a preferred embodiment, the low magnesium content surface of the magnesium-depleted layer is formed by cutting the surface of the treated aluminum alloy.

Therefore, the alloy structure with a low magnesium content surface provided by this work has an alloy layer with original magnesium content and a magnesium-depleted layer formed outside the alloy layer with original magnesium content, and the magnesium-depleted layer has A surface with low magnesium content can strengthen the weldability of the alloy and improve the yield of the joint.

In order to further understand the characteristics and technical content of this creation, please refer to the following detailed description and drawings of this creation. However, the drawings provided are for reference and explanation only, and are not intended to limit this creation.

The following is a description of the embodiments disclosed in this creation by specific specific examples. Those skilled in the art can understand the advantages and effects of this creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments. The details in this specification can also be based on different views and applications, and various modifications and changes can be made without departing from the concept of this creation. In addition, the drawings in this creation are only a schematic illustration, not based on actual size, and are declared in advance. The following embodiments will further describe the relevant technical content of the creation, but the disclosed content is not intended to limit the protection scope of the creation.

Please refer to Figure 1 for an alloy structure with a low magnesium content surface provided for this creation. As shown in the figure, the alloy structure having a surface with low magnesium content according to the present invention has an alloy layer 10 of original magnesium content and a magnesium-depleted layer 20 formed outside the alloy layer of original magnesium content. Wherein, the magnesium-depleted layer 20 has a surface 201 with low magnesium content, which can strengthen the weldability of the alloy and improve the bonding yield.

In this embodiment, the alloy layer 10 with original magnesium content is an aluminum alloy (with Mg) containing magnesium, but it may also be a magnesium alloy (Magnesium alloy), a titanium alloy (Titanium alloy), or other The alloy containing magnesium is not limited.

In this embodiment, the magnesium-depleted layer 20 and the alloy layer 10 containing the original magnesium are integrally formed. Specifically, the low-magnesium-content surface 201 of the magnesium-depleted layer 20 is formed by cutting the surface of the aluminum alloy after vacuum heat treatment. Also, the magnesium content of the magnesium-depleted layer 20 is less than the magnesium content of the alloy layer 10 of the original magnesium content.

Further, the aluminum alloy used to make the alloy structure with a low magnesium content surface may include silicon, copper, lead, aluminum, manganese, nickel, iron, tin, magnesium and other elements and inevitable impurities. The unavoidable impurities are substances that are unavoidably mixed in the raw materials, but do not affect the characteristics of the aluminum alloy, so they are allowed impurities. Among them, silicon element can be used to increase the strength of aluminum alloy, copper element can be used to enhance the hardness of aluminum alloy, lead element can be used to enhance the workability of aluminum alloy.

Please refer to Figure 2 again. The alloy structure with low magnesium content provided by this creation can be obtained by an alloy surface treatment method, which mainly includes the following steps:

(1) Vacuum heat treatment: put the aluminum alloy M on the jig P and put it in a vacuum furnace (figure omitted), and increase the temperature at a temperature increase rate of >15℃/min, preferably to 500℃~600℃ (if other For alloys, it is necessary to run from a few degrees according to the elements that will run to the surface of the alloy), temperature holding time> 30min, cooling time> 120min. The vacuum degree of the vacuum heat treatment is preferably >10 ^-4 torr. In addition, the aluminum alloy M can also be placed on the jig P and placed in a protective atmosphere furnace (not shown) and heated in a protective atmosphere (such as N2, Ar), preferably with an oxygen content >50 ppm.

(2) Obtain a magnesium-rich layer 30a (Mg-rich layer) with a high magnesium content in the surface layer, a magnesium-poor layer 20a (Mg-poor layer) with a thickness of >10 μm, and an alloy layer 10a (Original Mg-content layer) with original magnesium content ) Of an alloy structure. The magnesium content of the magnesium-rich layer 30a is 0.1-100%. In addition, the thickness of the magnesium-depleted layer 20a differs depending on the degree of vacuum and the holding time and temperature of the vacuum heat treatment. The higher the degree of vacuum, the longer the holding time and the higher the holding temperature, the thicker the thickness of the magnesium-depleted layer 20a . Moreover, the lower edge of the magnesium-depleted layer 20a in the alloy structure to the place in contact with the fixture P is the aluminum alloy with the original magnesium content, that is, the aluminum alloy does not expose the surface to the vacuum contact, and the magnesium-rich layer will not be generated 30a and magnesium-depleted layer 20a.

(3) Surface reduction treatment: The obtained alloy structure is subjected to surface reduction treatment to reduce the magnesium-rich layer 30a. After the magnesium-rich layer 30a is reduced, a welded surface with low magnesium content can be obtained. The welding surface is a low magnesium content surface 201a of the magnesium-depleted layer 20a, and the magnesium-depleted layer 20a will disappear due to non-vacuum baking above 50°C, and the higher the temperature, the faster the rate of disappearance. Therefore, the magnesium-depleted layer 20a should be suitable for welding, and the thickness should be at least >10 μm. In addition, the surface reduction method may be non-heating thinning methods such as pickling/alkali cleaning/grinding/polishing/etching, or other heating thinning methods, or other thinning methods under vacuum or protective atmosphere or inert atmosphere , Such as plasma cleaning.

Furthermore, the aluminum alloy M of the present embodiment is a 6-series aluminum alloy with magnesium (Mg) element. Since the 6-series aluminum alloy strengthened with Mg element has 3-series and 1-series aluminum alloys less strengthened with Mg element ( (Pure aluminum) has stronger strength, and after softening at high temperature, it can still use the subsequent heat treatment process to restore its strength and hardness. This structure will only change the surface element concentration by a small amount, will not greatly affect the overall element content, and can be effectively maintained. The original characteristics of 6-series aluminum alloy, such as heat treatment and strong strength. However, this structure can make the 6-series aluminum alloy form an analogous state to the low-magnesium surface of the 3-series and 1-series aluminum alloys that are easy to weld.

It should be noted that the method and structure provided in this creation can be applied to other magnesium-containing alloys in addition to aluminum alloys. In addition, this method and structure are not limited to the removal of magnesium content, and other elements that are easy to volatilize in vacuum or accumulate on the alloy surface, such as zinc, are also applicable. In other words, in addition to strengthening the weldability of aluminum alloys, this creation can also be applied to other alloys that need to reduce the presence of easily oxidized solid solution elements, such as magnesium and zinc.

In summary, the alloy structure with low magnesium content surface provided by this work has an alloy layer with original magnesium content and a magnesium-depleted layer formed outside the alloy layer with original magnesium content, and the The magnesium-depleted layer has a surface with low magnesium content, which can enhance the weldability of the alloy and improve the yield of solder joints.

The above is only a preferred and feasible embodiment of this creation, and it is not intended to limit the scope of the patent of this creation. Any changes and modifications made in accordance with the patent scope of this creation shall fall within the scope of this creation.

10,10a: alloy layer with original magnesium content 20, 20a: magnesium poor layer 30a: Magnesium-rich layer 201,201a: Low magnesium content surface M: aluminum alloy P: Fixture

FIG. 1 schematically shows the alloy structure of the surface with low magnesium content in this creation.

FIG. 2 schematically shows the alloy surface treatment method of the present creation.

10: Alloy layer with original magnesium content

20: magnesium-depleted layer

201: Low magnesium content surface

Claims (4)

An alloy structure with a low magnesium content surface includes: an alloy layer of raw magnesium content and a magnesium-depleted layer formed outside the alloy layer of raw magnesium content; wherein the magnesium-depleted layer has a low magnesium content Content of the surface. The alloy structure having a surface with low magnesium content as described in item 1 of the patent application range, wherein the thickness of the magnesium-depleted layer is at least greater than 10 μm. The alloy structure with a low magnesium content surface as described in item 1 of the patent application scope, wherein the magnesium-depleted layer and the original magnesium content alloy layer are made of an aluminum alloy containing magnesium, and the The magnesium content of the magnesium-depleted layer is less than the magnesium content of the alloy layer with the original magnesium content. The alloy structure with a low magnesium content surface as described in item 1 of the patent application range, wherein the low magnesium content surface of the magnesium-depleted layer is formed by reducing the surface of the heat-treated aluminum alloy.

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