WO2009152722A1

WO2009152722A1 - Aluminium alloy with high electrical conductivity and high yield strength, worked article and induction plate made of it

Info

Publication number: WO2009152722A1
Application number: PCT/CN2009/072022
Authority: WO
Inventors: 谢绍俊; 陈文�; 任运君
Original assignee: 西南铝业（集团）有限责任公司
Priority date: 2008-06-20
Filing date: 2009-05-27
Publication date: 2009-12-23
Also published as: CN101302591A

Abstract

An aluminum alloy having high electrical conductivity and high yield strength, comprises: iron about 0.40- about 0.70 wt%, copper about 0.20- about 0.40 wt%, silicon about 0.01- about 0.20 wt%, and balance Al. The preparation methods and application of the aluminum alloy are also provided. Worked article which is made of the aluminum alloy, especially induction plate for magnetic suspension train rail, is also provided.

Description

High conductivity, high yield strength aluminum alloy and its processed parts and sensor boards

Technical field

The present invention relates to an aluminum alloy, particularly an aluminum alloy having high electrical conductivity and high yield strength. The present invention also relates to a method and use for the preparation of the aluminum alloy, as well as a machined part and an induction plate manufactured using the aluminum alloy, particularly an induction plate for a magnetic levitation train track.

Background technique

Aluminium alloys have a range of excellent properties and are used in a wide range of applications including transportation, aerospace, building bridges, packaging containers, electrical and electronics, machinery manufacturing and the energy industry. The development of some special fields puts higher demands on the performance of aluminum alloys. For example, the induction plates for magnetic levitation trains require high electrical conductivity and high yield strength.

In the existing aluminum alloy, the electrical conductivity can reach above 58% IACS with pure aluminum and a small amount of alloy. Although the electrical conductivity of some aluminum alloy materials can basically reach the 60% IACS required by the induction plate, the processing state yield strength R _P 0. _{2 is} generally only about 40 N/mm ² , and the maximum is not more than 60 N/mm. ² , therefore, the requirements for use are not met.

The existing induction plates for magnetic levitation train tracks are mainly composed of copper alloy plates and steel plates. Copper alloys are expensive. If aluminum alloys can be used instead of copper alloys to make induction plates, huge economic benefits will be generated, and the cost of magnetic suspension train construction will be greatly saved, which will facilitate the widespread use of maglev trains.

Summary of the invention

An object of the present invention is to provide an aluminum alloy having high electrical conductivity and high yield strength, characterized in that the aluminum alloy comprises from about 0.40 to about 0.70% by weight of Fe, based on the total weight of the aluminum alloy. 0.20 to about 0.40% by weight of Cu, about 0.01 to about 0.20% by weight of Si and the balance of Al.

Another object of the present invention is to provide a method for producing an aluminum alloy having high electrical conductivity and high yield strength according to the present invention, which comprises from about 0.40 to about 0.70 wt% of Fe, respectively, based on the total weight of the aluminum alloy, of about 0.20. ~ about 0.40wt% Cu, about 0.01 to about 0.20 wt% of Si and the balance of the A1 batching furnace and smelting step. It is still another object of the present invention to provide an aluminum alloy workpiece made of an aluminum alloy having high electrical conductivity and high yield strength of the present invention.

Still another object of the present invention is to provide an aluminum alloy or aluminum alloy workpiece having high electrical conductivity and high yield strength of the present invention for use in the preparation of an induction plate, particularly an induction plate for a magnetic levitation train track.

Still another object of the present invention is to provide an induction plate, particularly an induction plate for a magnetic levitation train track, comprising the aluminum alloy or aluminum alloy workpiece of the present invention having high electrical conductivity and high yield strength.

According to the IACS (International Annealed Copper Standard) 3⁄4 test, the electrical conductivity of the aluminum alloy of the present invention is not less than about 59% IACS, and the yield strength R _{P of the} processed product. ₂ can be up to about 90 N/mm ² or more (increased by at least about 1.5 times compared to the prior art). Therefore, the aluminum alloy and the workpiece thereof of the present invention can be effectively applied to applications requiring high electrical conductivity and high yield strength, for example, aluminum for nuclear reactors, aluminum for electrical equipment, etc., in particular, can replace copper alloys. It is used to manufacture induction boards for magnetic levitation train tracks.

Compared with the aluminum alloy of the prior art, the aluminum alloy of the present invention achieves an optimized combination of high electrical conductivity and high yield strength by adding conventional elements Fe, Cu, Si to pure aluminum, which is economical and practical. In addition, the aluminum alloy and the workpiece thereof of the present invention have the advantages of low cost, light weight and high strength, and depending on the ratio between the elements, corrosion resistance, good brazability and machinability can be obtained. Advantages, and one or more of the properties can be further improved by adjusting the content of each component within the scope of the present invention according to practical applications (this adjustment can be easily achieved by those skilled in the art using means known in the art) Therefore, an aluminum alloy product excellent in overall performance can be further obtained.

The induction plate made of the aluminum alloy or the processed part thereof of the invention is a technical breakthrough in the field of induction plates, and is a huge breakthrough in the field of induction plates for magnetic suspension train tracks, which greatly saves the construction cost of the magnetic suspension train track, and will promote The development of maglev train technology plays an irreplaceable role.

detailed description In the context of the present invention, the percentages mentioned are by weight unless otherwise indicated. In addition, the range of values referred to herein includes endpoint values. Where "not greater than" or "not higher than" is used in the numerical range, including but not limited to the case where the specified composition has a zero content, for example, no more than 0.05 wt% of Zn may include the case where the alloy does not contain Zn. . The word "about" does not exclude the case where the content of the indicated component is slightly larger or slightly smaller than the index value due to the operational error, and it is preferred that the index value fluctuates within an error range of ± 5%.

In a first aspect of the invention, there is provided an aluminum alloy having high electrical conductivity and high yield strength, wherein the aluminum alloy comprises 0.40 to 0.70 wt% of Fe, 0.20 to 0.40 wt% based on the total weight of the aluminum alloy % Cu, 0.01 to 0.20 wt% of Si and the balance of Al.

In some embodiments of the invention, the aluminum alloy may contain tolerable impurities. The content of the allowable impurities is not particularly limited as long as the basic properties of the high conductivity, high yield strength aluminum alloy of the present invention are not impaired. In some preferred embodiments, based on total weight of the alloy, the total amount of said tolerable impurities not more than about 0.15wt%, preferably no more than about 0.10wt%, more preferably no more than about 0.05wt% _o

In a further embodiment, the content of each of the permissible impurities is no greater than about 0.05 wt%, preferably no greater than about 0.03 wt%, more preferably no greater than about 0.01 wt%.

The term "allowable impurities" in the present invention means a component which does not adversely affect the aluminum alloy of the present invention, especially a component which does not significantly adversely affect the high electrical conductivity and high yield strength of the aluminum alloy of the present invention. The allowable impurities may be components which are purposely introduced to improve the properties of the aluminum alloy of the present invention other than electrical conductivity and yield strength, and may also be components which are inevitably introduced due to production conditions. The allowable impurities preferably include one or more of Zn, Ti, Mg, Mn, In, Zr, Cr, M, Sc, V, Hf, Be, Sn, Co, B, and rare earth elements, It preferably includes Zn and Ti.

What contributes to the high electrical conductivity and high yield strength of the aluminum alloy of the present invention is the specific composition of Fe, Cu, Si and A1 as a matrix. The role of Fe is to increase the number of compound particles, refine the grain size, increase the recrystallization temperature, and increase the yield strength of the alloy during hot working, without damaging the conductivity or making the conductivity decrease less. When the content of Fe in the aluminum alloy of the invention is less than about 0.70% by weight, the yield strength can be increased to a large extent, and the electrical conductivity of the material does not decrease or decrease by ^I; when it is higher than 0.40 wt%, sufficient formation is formed. A large number of AlFeCu compounds phase points, thereby increasing the yield strength of the alloy. In a preferred embodiment of the invention, the Fe content is from about 0.55 to about 0.70% by weight, preferably from about 0.55 to about 0.65% by weight, more preferably about 0.60% by weight.

The role of Cu is to strengthen the matrix and increase the yield strength of the alloy. When the content of Cu in the aluminum alloy of the invention is less than 0.40% by weight, the yield strength can be significantly improved without significantly impairing the electrical conductivity of the material; when it is higher than 0.20 wt%, the mass of the AlFeCu phase compound can be increased, and the Cu element can be enlarged in the aluminum. The amount of solid solution in the alloy, thereby increasing the yield strength of the alloy. In a preferred embodiment of the invention, the Cu content is from about 0.20 to about 0.30% by weight, preferably from about 0.22 to about 0.28% by weight, more preferably about 0.25 % by weight.

Si is widely present in existing aluminum alloys and is an element that has a large influence on the electrical conductivity of aluminum alloys. The present invention is expected to avoid a large drop in the electrical conductivity of the aluminum alloy by strictly controlling the Si content. When the content of Si in the aluminum alloy of the invention is less than 0.20% by weight, the degree of decrease in electrical conductivity can be well controlled; when it is higher than 0.01% by weight, it is advantageous for production control, and the presence of a small amount of Si can also improve the strength of the alloy. Contribution. In a preferred embodiment of the invention, the Si content is from about 0.03 to about 0.20% by weight, preferably from about 0.10 to about 0.20% by weight, more preferably about 0.18% by weight.

In a second aspect of the invention, there is provided a method of preparing an aluminum alloy having high electrical conductivity and high yield strength according to the present invention, the method comprising from about 0.40 to about 0.70 wt%, respectively, based on the total weight of the aluminum alloy Fe, about 0.20 to about 0.40 wt% of Cu, about 0.01 to about 0.20 wt% of Si and the balance of the A1 batching furnace and smelting step.

The specific process steps and process conditions in the aluminum alloy preparation method of the present invention are not particularly limited, and can be determined by those skilled in the art according to common knowledge in the art and any conventional aluminum alloy preparation process known in the art, as long as It is sufficient to produce an aluminum alloy within the scope of the present invention.

In some embodiments of the invention, the process of preparing an aluminum alloy is allowed Impurable impurities are introduced. The allowable impurities may be purposefully introduced to further improve the performance of the aluminum alloy of the present invention other than electrical conductivity and yield strength, or may be inevitably introduced due to production conditions. The allowable impurities preferably include one or more of Zn, Ti, Mg, Mn, In, Zr, Cr, M, Sc, V, Hf, Be, Sn, Co, B, and rare earth elements, It preferably includes Zn and Ti.

In a preferred embodiment, in the aluminum alloy prepared according to the method of the present invention, the total amount of the permissible impurities is not more than about 0.15 wt%, preferably not more than about 0.10 wt%, more preferably based on the total weight of the aluminum alloy. Not more than about 0.05% by weight. In a further embodiment, the content of each of the permissible impurities is no greater than about 0.05 wt%, preferably no greater than about 0.03 wt%, more preferably no greater than about 0.01 wt% _o

Preferably, in the aluminum alloy prepared by the process according to the present invention, the content of Fe is from about 0.55~ about 0.70wt%, preferably from about 0.55~ about 0.65wt%, more preferably from about 0.60wt% _o

Preferably, in the aluminum alloy prepared by the process according to the present invention, the content of Cu is from about 0.20~ about 0.30wt%, preferably from about 0.22~ about 0.28wt%, more preferably from about 0.25wt% _o

Preferably, in the aluminum alloy prepared according to the method of the present invention, the Si content is from about 0.03 to about 0.20% by weight, preferably from about 0.10 to about 0.20% by weight, more preferably about 0.18% by weight.

In a third aspect of the invention, there is provided an aluminum alloy workpiece produced from an aluminum alloy according to the invention.

The aluminum alloy workpiece of the present invention can be formed into a variety of shapes suitable for applications such as sheets, profiles, forgings or other suitable shapes for applications by processing methods known in the art, such as rolling, extrusion or forging. get. The aluminum alloy ingot can be produced by a conventional method known in the art, preferably by, for example, a semi-continuous direct water-cooling casting process.

For example, in a specific embodiment for preparing the aluminum alloy workpiece of the present invention, the aluminum alloy workpiece of the present invention can be formed by the following steps:

a) Smelting: Raw aluminum ingots and other master alloys or pure gold containing the required alloying elements It is charged into the smelting furnace and heated to melt (for example, at a temperature of about 900 Å or more, preferably about 900 ° C to about 1050 Å, more preferably about 900 ～ to about 950 Å), and the obtained aluminum liquid is kept at the temperature. About 715" ~ about 740", preferably about 725" ~ about 735 is more preferably about 730 "); after the furnace material in the molten pool is fully melted, the slag is stirred; the melt composition is adjusted; and the aluminum alloy melt is transferred to the stationary furnace. The interior is allowed to stand and refined to purify the melt.

b) Casting: After the aluminum alloy melt in the static furnace is filtered by the filtration system, it flows into the crystallizer and is directly water-cooled into aluminum alloy ingots of different specifications.

c) Extrusion processing: aluminum alloy ingots of different specifications are fed into the extrusion cylinder (wherein the extrusion cylinder can be preheated to 260 ~ 440", preferably 260 ~ 360" preheating temperature) for extrusion, aluminum profiles After correction to the finished product.

In a fourth aspect of the invention, there is provided the use of an aluminum alloy or aluminum alloy workpiece according to the invention for the preparation of an induction plate. The sensing plate is preferably an induction plate for a magnetic levitation train track.

In a fifth aspect of the invention, there is provided an induction plate comprising an aluminum alloy or aluminum alloy workpiece according to the invention.

In a preferred embodiment of the invention, the induction plate is a composite plate composed of an aluminum alloy plus a workpiece and a steel plate. The sensing plate is preferably an inductive plate for a magnetic levitation train track. The sensing plate can be formed by methods known in the art such as bridging.

In the present invention, the term "aluminum alloy" means a general term for an alloy formed by adding other elements on the basis of A1.

In the present invention, the term "maglev train" includes, but is not limited to, the principle of "same-sex repulsive, opposite-sex attraction," which causes the traction locomotive motor and the track-sensing plate to generate magnetic force, so that the vehicle body is completely off-track, suspended in the distance track. For example, a train that vacates about 1 cm.

In the present invention, the term "induction plate for a magnetic levitation train" refers to a track type plate which is used as a traction force to propel the train forward with a magnetic force generated by a magnetic levitation train traction locomotive motor (rotor). The present invention will be further described in conjunction with the specific embodiments to facilitate the understanding of the present invention, but the invention is not limited thereto.

Example 1

The weight percentage of each element in the obtained aluminum alloy material is Fe: 0.50%, Cu: 0.20%, Si: 0.014%, Zn: 0.05%, Ti: 0.05%, impurity < 0.05%, total impurity < 0.15%, the rest For Al.

The aluminum alloy material of the present embodiment having high electrical conductivity and high yield strength is prepared by the following steps:

a) Smelting: The original aluminum ingot and other master alloys or pure metals containing the required alloying elements are placed in a melting furnace, heated to a melting temperature at a furnace temperature of about 900" to obtain an aluminum liquid having a temperature of about 730"; After the furnace material in the molten pool is fully melted, the slag slag is stirred; the melt composition is adjusted according to the proportion of the above alloying elements; the aluminum alloy melt is transferred to a static furnace for standing, and the melt is refined and purified.

b) Casting: After the aluminum alloy melt in the static furnace is filtered by the filtration system, it flows into the crystallizer and is directly water-cooled into a round aluminum ingot of Φ127.

c) Extrusion processing: The obtained round aluminum ingot is sent to the extrusion cylinder (preheating temperature is 260 ~ 360") for extrusion molding, and the aluminum profile is corrected to the finished product.

Example 2

The weight percentage of each element in the obtained aluminum alloy material is Fe: 0.65 %, Cu: 0.4%, Si: 0.18%, Zn: 0.07%, Ti: 0.15 %, impurity < 0.05%, total impurity < 0.15%, and the rest For A1. It was obtained in the same manner as in Example 1.

Example 3

The weight percentage of each element in the obtained aluminum alloy material is Fe: 0.40%, Cu: 0.30%, Si: 0.03%, Zn: 0.01%, Ti: 0.01%, impurity single < 0.05%, total impurity < 0.15%, and the rest For A1. It was obtained in the same manner as in Example 1.

Example 4

The obtained aluminum alloy material has a weight percentage of Fe: 0.50%, Cu: 0.20%, Si: 0.014%, Zn: 0.01%, Ti: 0.01%, impurity <0.05%, and total impurity <0.15%. The rest is Al. The same as in the first embodiment The steps are made.

Example 5

The weight percentage of each element in the obtained aluminum alloy material is Fe: 0.65 %, Cu: 0.4%, Si: 0.02%, Zn: 0.005 %, Ti: 0.01%, impurity < 0.05%, total impurity < 0.15%, and the rest For A1. It was obtained in the same manner as in Example 1.

Example 6

The weight percentage of each element in the obtained aluminum alloy material is Fe: 0.40%, Cu: 0.30%, Si: 0.10%, Zn: 0.05%, Ti: 0.05%, impurity < 0.05%, total impurity < 0.15%, and the rest For A1. It was obtained in the same manner as in Example 1.

Comparative example 1

The resulting aluminum alloy material of the elements in weight percentage of _{M g: 0.30%, Fe:} 0.95%, the single impurities <0.05%, total impurity content of <0.15%, the rest is Al. It was obtained in the same manner as in Example 1.

Comparative example 2

The weight percentage of each element in the obtained aluminum alloy material is M _g : 0.20 % , Fe:

0.55 %, Cu: 0.25%, impurity <0.05%, total impurity <0.15%, and the balance is Al. It was obtained in the same manner as in Example 1.

Comparative example 3

The obtained aluminum alloy material has a weight percentage of M _g : 0.85 %, Fe: 0.35%, Si: 0.35%, a single impurity of <0.05%, a total impurity of <0.15%, and the balance being Al. It was obtained in the same manner as in Example 1.

For the sake of comparison, the specific compositions of the aluminum alloy materials prepared in Examples 1-6 and Comparative Examples 1-3 are listed in Table 1.

Percentage of each element in the alloy, wt%

Numbering

Mg Fe Cu Si Zn Ti Al Impurity Example 1 - 0.50 0.20 0.014 0.05 0.05 Balance < 0.15% Example 2 - 0.65 0.40 0.18 0.07 0.15 Balance < 0.15% Example 3 - 0.40 0.30 0.03 0.01 0.01 Balance < 0.15% Example 4 - 0.50 0.20 0.014 0.01 0.01 Balance < 0.15% Example 5 - 0.65 0.40 0.02 0.005 0.01 balance < 0.15% Example 6 - 0.40 0.30 0.10 0.05 0.05 balance < 0.15% Comparative Example 1 0.30 0.95 - - - - Balance < 0.15% Comparative Example 2 0.20 0.55 0.25 - - - Balance < 0.15% Comparative Example 3 0.85 0.35 - 0.35 - - Balance < 0.15%

Test Example 1: Evaluation of Conductivity

The electrical conductivity of the aluminum alloy materials prepared in the above Examples 1-6 and Comparative Examples 1-3 was examined using "YS/T478-200 Copper and Copper Alloy Conductivity Eddy Current Testing Method".

Test instrument: sigmatest2.069 eddy current conductivity meter (made by FOERSTER, Germany)

Test frequency: 60KHZ

Standard block: 539

Test block: thickness 4.0mm X length 50mm x width 50mm

Test temperature: room temperature (about 25")

Test Example 2: Evaluation of yield strength, tensile strength and elongation

The yield strength, tensile strength and elongation of the aluminum alloy materials prepared in the above Examples 1-6 and Comparative Examples 1-3 were examined by "GB/T228-2002 Metallic Material Tensile Test Method".

Test equipment: AG-IS100KN tensile testing machine (manufactured by Shimadzu SHIMADZU Co., Ltd.)

Processing performance sample: 2.5mm wide dumbbell type specimen

Test temperature: room temperature (about 25")

Stretching speed: 5mm/min Table 2 below lists the performance test results of the aluminum alloy materials prepared in Examples 1-6 and Comparative Examples 1-3.

Table 2

Seen from Table 2, the conductivity of the aluminum alloy material according to Example 1-6 of the present invention is not less than 59% IACS, and a yield strength R _P 0. ₂ were 90N / mm ² or more, clearly superior to Comparative Example 1 -3 aluminum alloy.

As described above, the invention has been exemplified by the preferred embodiments of the invention, but the invention should not be limited to the embodiments. Numerous alternatives, variations, and/or modifications of these embodiments can be made by those skilled in the art in light of the teachings herein. These alternative, modified and/or modified embodiments should fall apart from the teachings of the present invention. Within the scope of protection of the present invention.

Claims

Rights request

What is claimed is: 1. An aluminum alloy having high electrical conductivity and high yield strength, characterized in that the aluminum alloy comprises from about 0.40 to about 0.70% by weight of Fe, from about 0.20 to about 0.40% by weight, based on the total weight of the aluminum alloy. Cu, about 0.01 to about 0.20% by weight of Si and the balance of Al.

2. The aluminum alloy according to claim 1, wherein the aluminum alloy contains allowable impurities, and based on the total weight of the aluminum alloy, the total amount of the allowable impurities is not more than about 0.15 wt%, preferably not more than About 0.10% by weight, more preferably no more than about 0.05% by weight _o

3. The aluminum alloy according to claim 2, wherein the content of each of the allowable impurities is not more than about 0.05% by weight, preferably not more than about 0.03% by weight, based on the total weight of the aluminum alloy. It is preferably no more than about 0.01% by weight.

4. The aluminum alloy according to claim 2 or 3, wherein the allowable impurities include Zn, Ti, Mg, Mn, In, Zr, Cr, M, Sc, V, Hf, Be, Sn, Co, One or more of B and rare earth elements.

5. The aluminum alloy according to claim 4, wherein the allowable impurities include Zn and Ti.

The aluminum alloy according to any one of claims 1 to 3, wherein the Fe content is from about 0.55 to about 0.70% by weight, preferably from about 0.55 to about 0.65% by weight, more preferably, based on the total weight of the aluminum alloy. 0.60 wt%.

The aluminum alloy according to any one of claims 1 to 3, wherein the content of Cu is from about 0.20 to about 0.30% by weight, preferably from about 0.22 to about 0.28% by weight, more preferably, based on the total weight of the aluminum alloy. 0.25 wt%.

The aluminum alloy according to any one of claims 1 to 3, wherein the content of Si is from about 0.03 to about 0.20% by weight, preferably from about 0.10 to about 0.20% by weight, more preferably, based on the total weight of the aluminum alloy. 0.18 wt%.

9. A method of preparing an aluminum alloy according to claim 1, the method comprising, respectively, from about 0.40 to about 0.70 wt% of Fe, based on the total weight of the aluminum alloy, From about 0.20 to about 0.40% by weight of Cu, from about 0.01 to about 0.20% by weight of Si and the balance

The step of preparing and melting the A1 ingredients.

10. The method according to claim 9, wherein an allowable impurity is introduced during the preparation of the aluminum alloy, and the total amount of the allowable impurities is not more than about 0.15 wt% based on the total weight of the aluminum alloy. Preferably, it is no more than about 0.10% by weight, more preferably no more than about 0.05% by weight.

11. The method according to claim 10, wherein the content of each of the allowable impurities is not more than about 0.05% by weight, preferably not more than about 0.03% by weight, more preferably based on the total weight of the aluminum alloy. Not more than about 0.01% by weight.

The method according to claim 10 or 11, wherein the allowable impurities include Zn, Ti, Mg, Mn, In, Zr, Cr, M, Sc, V, Hf, Be, Sn, Co, B And one or more of rare earth elements.

13. The method of claim 12, wherein the tolerable impurities comprise Zn and Ti.

The method according to any one of claims 9 to 11, wherein the Fe content is from about 0.55 to about 0.70 wt%, preferably from about 0.55 to about 0.65 wt%, more preferably about 0.60, based on the total weight of the aluminum alloy. Wt%.

The method according to any one of claims 9 to 11, wherein the content of Cu is from about 0.20 to about 0.30% by weight, preferably from about 0.22 to about 0.28% by weight, more preferably about 0.25, based on the total weight of the aluminum alloy. Wt%.

The method according to any one of claims 9 to 11, wherein the content of Si is from about 0.03 to about 0.20% by weight, preferably from about 0.10 to about 0.20% by weight, more preferably about 0.18, based on the total weight of the aluminum alloy. Wt%.

17. An aluminum alloy workpiece produced from an aluminum alloy according to any one of claims 1-8.

18. The aluminum alloy workpiece of claim 17, wherein the aluminum alloy workpiece is a sheet, profile, forging or other workpiece of various shapes suitable for the application.

The aluminum alloy workpiece according to claim 17 or 18, wherein said The aluminum alloy workpiece is produced by rolling, extruding or forging an aluminum alloy ingot.

Use of an aluminum alloy according to any one of claims 1-8 or an aluminum alloy workpiece according to any one of claims 17-19 for the preparation of an induction plate.

The use according to claim 20, wherein said sensing plate is an inductive plate for a magnetic levitation train track.

An induction plate, characterized in that the induction plate comprises the aluminum alloy according to any one of claims 1-8 or the aluminum alloy workpiece according to any one of claims 17-19.

The induction plate according to claim 22, wherein the induction plate is a composite plate composed of an aluminum alloy workpiece and a steel plate.

The sensor board according to claim 22 or 23, wherein the sensor board is an induction board for a magnetic levitation train track.