CN116039175A - Ultrathin-interface ultrathin aluminum-copper composite strip and preparation method thereof - Google Patents
Ultrathin-interface ultrathin aluminum-copper composite strip and preparation method thereof Download PDFInfo
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- CN116039175A CN116039175A CN202211670798.1A CN202211670798A CN116039175A CN 116039175 A CN116039175 A CN 116039175A CN 202211670798 A CN202211670798 A CN 202211670798A CN 116039175 A CN116039175 A CN 116039175A
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- C—CHEMISTRY; METALLURGY
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- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
An ultrathin interface ultrathin aluminum-copper composite strip and a preparation method thereof are provided, wherein the strip is formed by rolling and compositing aluminum foil and copper foil; wherein, the aluminum foil comprises the following components: 0.2 to 0.4 percent of magnesium, 0.01 to 0.03 percent of erbium and the balance of aluminum or aluminum alloy; the copper foil comprises electronic oxygen-free copper with the purity more than or equal to 99.99%; the thickness of the combined interface layer of the composite strip is less than or equal to 0.01mm, the thickness ratio of copper to aluminum is 1/9-1/11, and the thickness of the strip is 0.18-0.24 mm. The preparation method comprises the following steps: and (3) carrying out leveling and polishing treatment on the surfaces of the aluminum alloy and copper, obtaining a preformed ingot blank through friction stir welding, and carrying out cold rolling composite forming, intermediate rolling forming, precise rolling forming and finished product annealing. The method can control the thickness of the composite layer, realize the effective composite of the ultrathin aluminum copper composite strip, simultaneously obtain the surface with infinite length and good forming quality, realize the mass preparation of the ultrathin interface ultrathin aluminum copper composite strip, and realize the application in electronic products.
Description
Technical Field
The invention belongs to the technical field of metal composite strip preparation, and particularly relates to an ultrathin aluminum-copper composite strip with an ultrathin interface and a preparation method thereof.
Background
With rapid development of technology, the application requirements of modern technology on materials have contradictory requirements besides conventional physical, chemical and mechanical properties, such as: good electrical conductivity, high thermal conductivity, low contact resistance and bright outer surface, but at a low price. It is difficult for a single metal material to meet these requirements simultaneously, and composite materials have been developed that have excellent comprehensive properties while having lower prices.
The aluminum-copper composite material is one of novel composite materials, has the advantages of good conductivity, high heat conductivity and low contact resistance of copper, aluminum is low in price, and aluminum-copper composite material also has the advantages of light weight and corrosion resistance, not only maintains the excellent characteristics of the original metal, but also has better comprehensive performance than single metal. Can be applied to various fields such as rail transit, power electronics, aerospace, petrochemical industry, living appliances and the like.
The aluminum-copper composite material prepared by the prior various composite technologies has solid solution areas formed by atomic diffusion at the composite interfaces, so that the interface bonding strength is improved, but brittle and hard intermetallic compounds are extremely easy to form at the composite interfaces, so that the mechanical properties of the material are reduced, the thickness of a composite layer is thicker, the comprehensive properties of the material are influenced, the connection of the aluminum-copper composite material is difficult to realize, and the mass production is realized.
Therefore, how to reduce the formation of the intermediate phase, ensure the thickness of the composite layer, realize the connection of the aluminum-copper composite material and be the key for obtaining the high-quality mass production of the aluminum-copper composite strip.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the ultrathin aluminum-copper composite strip with an ultrathin interface and the preparation method thereof, which can realize effective compounding of the ultrathin aluminum-copper composite strip, effectively reduce the thickness of the composite interface and realize connection of aluminum-copper composite materials.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an ultrathin-interface ultrathin aluminum-copper composite strip is formed by rolling and compositing aluminum foil and copper foil; wherein, the aluminum foil comprises the following components: 0.2 to 0.4 percent of magnesium, 0.01 to 0.03 percent of erbium and the balance of aluminum or aluminum alloy; the copper foil comprises electronic oxygen-free copper with the purity more than or equal to 99.99%; the thickness of the combined interface layer of the composite strip is less than or equal to 0.01mm, the thickness ratio of copper to aluminum is 1/9-1/11, and the thickness of the strip is 0.18-0.24 mm.
The ultra-thin interfacial ultra-thin aluminum copper composite strip as described above is preferably one of 2-series, 3-series, 4-series, 5-series, 6-series and 7-series aluminum alloys.
On the other hand, the invention provides a preparation method of an ultrathin-interface ultrathin aluminum-copper composite strip, which comprises the following steps:
I. smelting and casting an aluminum alloy ingot blank and a pure copper ingot blank, cogging and rolling an aluminum ingot and a copper ingot into a sheet; wherein, the aluminum alloy ingot comprises the following components: 0.2 to 0.4 percent of magnesium, 0.01 to 0.03 percent of erbium and the balance of aluminum or aluminum alloy; the copper ingot comprises electronic oxygen-free copper with the purity more than or equal to 99.99 percent;
II, taking aluminum copper plates with the same width and length, leveling and polishing the surfaces; then cleaning the surface, stacking aluminum copper plates, and performing friction stir welding preforming at one end;
III, rolling and compounding the preformed aluminum copper material;
IV, performing end-to-end friction stir welding on the aluminum-copper composite plate subjected to the compounding to form a long plate;
v, performing middle rolling forming on the connected aluminum-copper composite long plates to finish further strip forming;
VI, carrying out finish rolling and rolling on the aluminum copper composite strip;
and VII, carrying out finished product annealing on the finish rolled aluminum-copper composite material to obtain the ultrathin aluminum-copper composite strip with the ultrathin interface.
In the above preparation method, preferably, in the step I, the aluminum ingot is cogged and rolled into a thin plate with a thickness of 6.2-6.8 mm, and the copper ingot is cogged and rolled into a thin plate with a thickness of 0.12-0.18 mm.
In the preparation method, preferably, the surface polishing in the step II is performed by brushing machine treatment, pneumatic sand blasting treatment or angle grinder polishing treatment with a turbine, and the surface roughness reaches Ra not less than 3.2; the aluminum plate is subjected to friction stir welding under the upper copper foil, the stirring head is pressed down to be smaller than the thickness of the composite plate by 0.05-0.1 mm, the inclination angle of the stirring head is 1-2 degrees, the rotating speed of the stirring head is 800-1500 r/min, and the welding speed is 20-40 mm/min, and friction stir welding connection is performed.
In the preparation method, preferably, the rolling composite first-pass rolling reduction of the step III is not less than 50%, the rolling speed is not more than 10cm/s, and the total rolling reduction after rolling is 60-80%.
In the preparation method, preferably, the copper side of the friction stir welding in the step VI is arranged below the upper aluminum side, the stirring head is pressed down to be smaller than the thickness of the composite board by 0.02-0.05 mm, the inclination angle of the stirring head is 1-2 degrees, the rotating speed of the stirring head is 800-1500 r/min, and the welding speed is 20-40 mm/min, so that the friction stir welding connection is carried out.
In the above preparation method, preferably, the reduction rate of the intermediate rolling forming pass in the step V is not less than 40%, and the rolling speed is not more than 50cm/s.
In the above preparation method, preferably, the reduction rate of the finish rolling forming pass in the step VI is not more than 20%, and a front-back tension device is added, so that the composite board after being rolled is rolled back and forth until the thickness of the finished product is 0.18-0.24 mm, and then is rolled.
The preparation method is characterized in that the annealing of the finished product in the step VI is preferably vacuum annealing at 400-450 ℃ for 1-2 hours.
The preparation process of the aluminum alloy melt comprises the following steps:
and (3) putting pure aluminum into a non-vacuum smelting furnace, heating and melting, regulating the temperature of a melt to 630-700 ℃, adding pure Mg, preserving heat and stirring for 30-60 min, adding rare earth elements, and preserving heat for 20-40 min again. And casting the aluminum alloy melt into a graphite mold, and cooling and solidifying to obtain an aluminum alloy cast ingot.
The invention solves the technical problems that when the aluminum copper foil composite strip is prepared, a large amount of intermetallic compounds are formed at the aluminum copper composite interface, so that the interface layer is thicker, the thickness of the strip is increased, and the mechanical property of the material is reduced. In order to solve the technical problem, the invention adopts the following technical measures:
1. the aluminum alloy side of the composite strip adopts an A1-Mg (RE) aluminum alloy system, and a small amount of magnesium is added into aluminum to strengthen the hardness and tensile strength of the aluminum alloy; the aluminum alloy is added with trace rare earth erbium, so that the purposes of grain refinement, strength increase and conductivity improvement can be achieved. Therefore, the aluminum alloy sheet is matched with the copper sheet in terms of hardness, strength and conductivity, and the rolling performance and the service performance of the composite strip are improved.
2. In the preforming step, one ends of the two metal sheets are welded by friction stir welding, so that the feeding operation can be accurately controlled in rolling.
3. The method of the invention carries out rolling compounding on the preformed aluminum-copper composite board, then carries out friction stir welding to connect the compounded board, carries out intermediate rolling and finish rolling to form a belt and winds, and finally carries out annealing treatment on the finished product. The multiple rolling operations have only one annealing treatment, avoiding the formation of a large amount of intermetallic compounds in the multiple pass annealing. Therefore, the obtained aluminum-copper composite strip has few intermetallic compounds, and the thickness of the composite interface is not more than 0.01mm.
4. And adopting friction stir welding to carry out butt welding between aluminum-copper composite sheets, so as to obtain strips with infinite length.
The invention has the beneficial effects that: the method can control the thickness of the composite layer, realize the effective composite of the ultrathin aluminum-copper composite strip, and the thickness of the obtained copper foil layer reaches 0.02mm, the thickness ratio of copper to aluminum reaches 1/11, and the thickness of the aluminum-copper composite interface layer is less than or equal to 0.01mm. At the same time, a surface of indefinite length and good forming quality can be obtained. The preparation method is simple, saves the copper consumption, reduces the cost, is beneficial to realizing mass production, and realizes engineering application in electronic products.
Drawings
FIG. 1 is an electron micrograph of a cross-section of an aluminum-copper composite strip according to example 1 of the present invention.
FIG. 2 is an electron micrograph of a cross-section of an aluminum-copper composite strip according to example 2 of the present invention
FIG. 3 is an electron micrograph of a cross-section of an aluminum-copper composite strip according to example 3 of the present invention
FIG. 4 is an electron micrograph of a cross-section of an aluminum-copper composite strip according to comparative example 1 of the present invention
Fig. 5 is a flow chart of the operation of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail, and the embodiments and specific operation procedures are given by the present embodiment on the premise of the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
Example 1
The operation flow of the ultrathin-interface ultrathin aluminum-copper composite strip is shown in figure 5.
Step 1: material preparation
And (3) putting pure aluminum into a non-vacuum smelting furnace, heating and melting, regulating the temperature of a melt to 630 ℃, adding 0.2wt% of pure Mg, keeping the temperature and stirring for 40min, adding 0.01wt% of erbium, and keeping the temperature for 30min again. And casting the aluminum alloy melt into a graphite mold, and cooling and solidifying to obtain an aluminum alloy cast ingot.
The pure copper was refined with a mold of the same size and cast.
And respectively cogging and rolling the aluminum alloy and the copper cast ingot which are cast, and obtaining the thickness delta 1=6.5 mm plus or minus 0.3mm of the aluminum alloy plate, and the thickness delta 2=0.15 mm plus or minus 0.03mm of the copper plate after intermediate rolling and finish rolling. And uniformly cutting into plates with the width of 250mm and the length of 1000 mm.
And (3) putting the prepared plate into a leveling machine for plate type leveling, putting into a brushing machine for surface polishing by using 100-mesh sand paper, and enabling the polishing directions of the aluminum alloy and the copper plate to be consistent, so that the surface roughness Ra is more than or equal to 3.2. Removing the surface oxide film, then removing surface impurities and greasy dirt by washing liquid, flushing the surface by clean water, dehydrating by alcohol, and drying by an air heater.
Step 2: friction stir welding preform
The prepared aluminum copper plate is fixed on a friction stir welding platform, the welding direction is the width direction of the plate, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is completed. And (3) pressing the aluminum plate on the upper part and the copper plate on the lower part until the aluminum plate invades the copper plate by 0.1mm, wherein the inclination angle of the stirring head is 2 degrees, the rotating speed of the stirring head is 1500r/min, the welding speed is 40mm/min, and performing friction stir welding to finish the preforming of the aluminum-copper dissimilar metal material composite plate.
Step 3: rolling composite
And (3) placing the preformed aluminum-copper dissimilar metal material composite plate into a rolling mill, and carrying out rolling compounding at a rolling speed of 3cm/s at a first rolling reduction rate of 80%. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 3mm.
Step 4: friction stir welding joint
The two aluminum copper dissimilar metal material composite plates which are subjected to rolling compounding are connected end to end and fixed on a friction stir welding platform, the welding direction is the width direction of the plates, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is finished. The copper side of the composite board is up, the aluminum side is down, the stirring head is pressed down to be smaller than the thickness of the composite board by 0.05mm, and the inclination angle of the stirring head is 2. The rotation speed of the stirring head is 1500r/min, the welding speed is 40mm/min, and friction stir welding connection is carried out.
Step 5: middle rolling forming
And (3) placing the aluminum copper dissimilar metal material composite plate connected by friction stir welding into a rolling mill, and rolling at a pass reduction rate of 60% and a rolling speed of 20 cm/s. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 1mm.
Step 6: finish rolling
And (3) strictly controlling the pass reduction by 10%, and rolling the composite board after intermediate rolling by a front-back tension device until the thickness reaches the thickness of a finished product.
Step 7: annealing of finished products
And (3) carrying out vacuum annealing treatment on the finished product of the rolled aluminum-copper composite material for 1h at the temperature of 450 ℃ to eliminate the work hardening of the aluminum-copper composite material, thereby obtaining the ultrathin aluminum-copper composite strip with an ultrathin interface.
FIG. 1 is a photograph of a cross-section of an obtained aluminum-copper composite strip. The photo shows that the aluminum alloy mainly comprises an aluminum alloy matrix and a copper matrix, an extremely thin aluminum-copper composite interface exists in the middle, the thickness of a copper foil layer of the composite interface is 0.02mm, the thickness of an aluminum alloy thin layer is 0.22mm, the thickness ratio of copper to aluminum is 1/11, and the thickness of the aluminum-copper composite interface layer is less than 0.01mm. The composite strip was tested for electrical resistivity and showed a 61.3% iacs conductivity of the composite measured from the aluminum alloy side.
Example 2
Step 1: material preparation
An aluminum alloy ingot and a copper ingot were prepared in the same manner as in example 1.
And respectively cogging and rolling the aluminum alloy and the copper cast ingot which are cast, and obtaining the thickness delta 1=6.5 mm plus or minus 0.3mm of the aluminum alloy plate, and the thickness delta 2=0.15 mm plus or minus 0.03mm of the copper plate after intermediate rolling and finish rolling. And uniformly cutting into plates with the width of 300mm and the length of 1500 mm.
And (3) putting the prepared plate into a leveler for plate type leveling, and putting the plate into a pneumatic sand blasting machine for surface impact by selecting 100-mesh gravel until the surface roughness Ra is more than or equal to 3.2. Removing the surface oxide film, then removing surface impurities and greasy dirt by washing liquid, flushing the surface by clean water, dehydrating by alcohol, and drying by an air heater.
Step 2: friction stir welding preform
The prepared aluminum copper plate is fixed on a friction stir welding platform, the welding direction is the width direction of the plate, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is completed. And (3) pressing the aluminum plate on the upper part and the copper plate on the lower part until the aluminum plate invades the copper plate by 0.1mm, wherein the inclination angle of the stirring head is 2 degrees, the rotating speed of the stirring head is 1000r/min, the welding speed is 30mm/min, and performing friction stir welding to finish the preforming of the aluminum-copper dissimilar metal material composite plate.
Step 3: rolling composite
And (3) placing the preformed aluminum-copper dissimilar metal material composite plate into a rolling mill, and carrying out rolling compounding at a rolling speed of 8cm/s at a first pass rolling reduction rate of 60%. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 3mm.
Step 4: friction stir welding joint
The two aluminum copper dissimilar metal material composite plates which are subjected to rolling compounding are connected end to end and fixed on a friction stir welding platform, the welding direction is the width direction of the plates, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is finished. The copper side of the composite board is up, the aluminum side is down, the stirring head is pressed down to be smaller than the thickness of the composite board by 0.05mm, and the inclination angle of the stirring head is 2. The stirring head rotates at 1000r/min and the welding speed is 30mm/min, and friction stir welding connection is carried out.
Step 5: middle rolling forming
And (3) placing the aluminum copper dissimilar metal material composite plate connected by friction stir welding into a rolling mill, and rolling at a pass reduction rate of 50% and a rolling speed of 30 cm/s. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 1mm.
Step 6: finish rolling
And (3) strictly controlling the pass reduction by 15%, and rolling the composite board after the middle rolling by a front-back tension device until the thickness reaches the thickness of a finished product.
Step 7: annealing of finished products
And (3) carrying out vacuum annealing treatment on the finished product of the rolled aluminum-copper composite material for 1.5h at 430 ℃ to eliminate work hardening of the aluminum-copper composite material, thereby obtaining the ultrathin aluminum-copper composite strip with an ultrathin interface.
Fig. 2 is a cross-sectional electron micrograph of the aluminum-copper composite strip obtained. The photo shows that the aluminum alloy strip mainly comprises an aluminum alloy matrix and a copper matrix, an extremely thin aluminum-copper composite interface exists in the middle, the thickness of the copper foil layer of the obtained aluminum-copper composite strip is 0.02mm, the thickness of the aluminum alloy thin layer is 0.20mm, the thickness ratio of copper to aluminum is 1/10, and the thickness of the aluminum-copper composite interface layer is less than 0.01mm. The composite strip was tested for electrical resistivity and showed a 61.5% iacs conductivity of the composite measured from the aluminum alloy side.
Example 3
Step 1: material preparation
An aluminum alloy ingot and a copper ingot were prepared in the same manner as in example 1.
And respectively cogging and rolling the aluminum alloy and the copper cast ingot which are cast, and obtaining the thickness delta 1=6.5 mm plus or minus 0.3mm of the aluminum alloy plate, and the thickness delta 2=0.15 mm plus or minus 0.03mm of the copper plate after intermediate rolling and finish rolling. And uniformly cutting into plates with the width of 400mm and the length of 2000 mm.
And (3) putting the prepared plate into a leveler for plate type leveling, and polishing the surface of the plate by using an angle grinder, wherein the polishing directions of the aluminum alloy and the copper plate are consistent, and the surface roughness Ra is more than or equal to 3.2. Removing the surface oxide film, then removing surface impurities and greasy dirt by washing liquid, flushing the surface by clean water, dehydrating by alcohol, and drying by an air heater.
Step 2: friction stir welding preform
The prepared aluminum copper plate is fixed on a friction stir welding platform, the welding direction is the width direction of the plate, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is completed. And (3) pressing the aluminum plate on the upper part and the copper plate on the lower part until the aluminum plate invades the copper plate by 0.1mm, wherein the inclination angle of the stirring head is 2 degrees, the rotating speed of the stirring head is 800r/min, the welding speed is 20mm/min, and performing friction stir welding to finish the preforming of the aluminum-copper dissimilar metal material composite plate.
Step 3: rolling composite
And (3) placing the preformed aluminum-copper dissimilar metal material composite plate into a rolling mill, and carrying out rolling compounding with a first-pass rolling reduction rate of 50% and a rolling speed of 10 cm/s. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 3mm.
Step 4: friction stir welding joint
The two aluminum copper dissimilar metal material composite plates which are subjected to rolling compounding are connected end to end and fixed on a friction stir welding platform, the welding direction is the width direction of the plates, and a welding guide plate with the thickness consistent with that of the material to be welded is connected at the welding end position, so that a keyhole is avoided after welding is finished. The copper side of the composite board is up, the aluminum side is down, the stirring head is pressed down to be smaller than the thickness of the composite board by 0.05mm, the inclination angle of the stirring head is 2 degrees, the rotating speed of the stirring head is 800r/min, the welding speed is 20mm/min, and friction stir welding connection is carried out.
Step 5: middle rolling forming
And (3) placing the aluminum copper dissimilar metal material composite plate connected by friction stir welding into a rolling mill, and rolling at a pass reduction rate of 40% and a rolling speed of 50cm/s. Until the thickness of the aluminum-copper dissimilar metal material composite board reaches about 1mm.
Step 6: finish rolling
And (3) strictly controlling the pass reduction by 20%, and rolling the composite board after the middle rolling by a front-back tension device until the thickness reaches the thickness of a finished product.
Step 7: annealing of finished products
And (3) carrying out vacuum annealing treatment on the finished product of the rolled aluminum-copper composite material for 2 hours at 400 ℃ to eliminate the work hardening of the aluminum-copper composite material, thereby obtaining the ultrathin aluminum-copper composite strip with an ultrathin interface.
Fig. 3 is a cross-sectional electron micrograph of the aluminum-copper composite strip obtained. The photo shows that the aluminum alloy strip mainly comprises an aluminum alloy matrix and a copper matrix, an extremely thin aluminum-copper composite interface exists in the middle, the thickness of the copper foil layer of the obtained aluminum-copper composite strip is 0.02mm, the thickness of the aluminum alloy thin layer is 0.18mm, the thickness ratio of copper to aluminum is 1/9, and the thickness of the aluminum-copper composite interface layer is less than 0.01mm. The composite strip was tested for electrical resistivity and showed a 61.4% iacs conductivity of the composite measured from the aluminum alloy side.
Comparative example 1
A composite strip was prepared in the same manner as in example 1 except that erbium was not added to the aluminum alloy.
Fig. 4 is an electron micrograph of a cross-section of the aluminum-copper composite strip obtained. The photo is mainly composed of an aluminum alloy matrix and a copper matrix, an extremely thin aluminum-copper composite interface exists in the middle, the composite interface is in a zigzag shape, the fact that the strength difference of two metals of the interface layer is large is indicated, and the aluminum alloy matrix is provided with partial scratches, so that the strength of the aluminum alloy is low. The thickness of the copper foil layer is 0.024mm, the thickness of the aluminum alloy thin layer is 0.216mm, the thickness ratio of copper to aluminum is 1/9, and the thickness of the aluminum-copper composite interface layer is less than 0.01mm. The composite strip was tested for electrical resistivity and the electrical conductivity of the composite material measured from the aluminum alloy side was 57.3% iacs.
Claims (10)
1. An ultrathin-interface ultrathin aluminum-copper composite strip is characterized in that the strip is formed by rolling and compositing aluminum foil and copper foil; wherein, the aluminum foil comprises the following components: 0.2 to 0.4 percent of magnesium, 0.01 to 0.03 percent of erbium and the balance of aluminum or aluminum alloy; the copper foil comprises electronic oxygen-free copper with the purity more than or equal to 99.99%; the thickness of the combined interface layer of the composite strip is less than or equal to 0.01mm, the thickness ratio of copper to aluminum is 1/9-1/11, and the thickness of the strip is 0.18-0.24 mm.
2. The ultra-thin interfacial ultra-thin aluminum-copper composite strip of claim 1, wherein the aluminum alloy is one of a 2-series, a 3-series, a 4-series, a 5-series, a 6-series, and a 7-series aluminum alloy.
3. The preparation method of the ultrathin-interface ultrathin aluminum-copper composite strip is characterized by comprising the following steps of:
I. smelting and casting an aluminum alloy ingot blank and a pure copper ingot blank, cogging and rolling an aluminum ingot and a copper ingot into a sheet; wherein, the aluminum alloy ingot comprises the following components: 0.2 to 0.4 percent of magnesium, 0.01 to 0.03 percent of erbium and the balance of aluminum or aluminum alloy; the copper ingot comprises electronic oxygen-free copper with the purity more than or equal to 99.99 percent;
II, taking aluminum copper plates with the same width and length, leveling and polishing the surfaces; then cleaning the surface, stacking aluminum copper plates, and performing friction stir welding preforming at one end;
III, rolling and compounding the preformed aluminum copper material;
IV, performing end-to-end friction stir welding on the aluminum-copper composite plate subjected to the compounding to form a long plate;
v, performing middle rolling forming on the connected aluminum-copper composite long plates to finish further strip forming;
VI, carrying out finish rolling and rolling on the aluminum copper composite strip;
and VII, carrying out finished product annealing on the finish rolled aluminum-copper composite material to obtain the ultrathin aluminum-copper composite strip with the ultrathin interface.
4. A method according to claim 3, wherein step I is performed by cogging and rolling an aluminum ingot into a sheet material having a thickness of 6.2 to 6.8mm, and cogging and rolling a copper ingot into a sheet material having a thickness of 0.12 to 0.18 mm.
5. The preparation method of claim 3, wherein the surface polishing in the step II is performed by brushing machine treatment, pneumatic sand blasting treatment or angle grinder polishing treatment with a turbine, and the surface roughness reaches Ra not less than 3.2; the aluminum plate is subjected to friction stir welding under the upper copper foil, the stirring head is pressed down to be smaller than the thickness of the composite plate by 0.05-0.1 mm, the inclination angle of the stirring head is 1-2 degrees, the rotating speed of the stirring head is 800-1500 r/min, and the welding speed is 20-40 mm/min, and friction stir welding connection is performed.
6. The method according to claim 3, wherein the rolling composite first pass rolling reduction in the step III is not less than 50%, the rolling speed is not more than 10cm/s, and the total rolling reduction after rolling is 60-80%.
7. The method of manufacturing according to claim 3, wherein the copper side of the friction stir welding in step VI is located below the upper aluminum side, the stirring head is pressed down to a thickness smaller than 0.02-0.05 mm of the composite plate, the inclination angle of the stirring head is 1-2 °, the rotation speed of the stirring head is 800-1500 r/min, and the welding speed is 20-40 mm/min, and friction stir welding connection is performed.
8. The method according to claim 3, wherein the reduction rate of the intermediate rolling forming pass in the step V is not less than 40% and the rolling speed is not more than 50cm/s.
9. The method according to claim 3, wherein the reduction rate of the finish rolling forming pass in the step VI is not more than 20%, and a front-back tension device is added to roll the composite plate after the intermediate rolling to a thickness of 0.18-0.24 mm, and then the composite plate is rolled.
10. The method of any one of claims 3 to 9, wherein the final annealing in step VI is vacuum annealing at 400-450 ℃ for 1-2 hours.
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| CN117505580A (en) * | 2023-11-01 | 2024-02-06 | 湖南方恒新材料技术股份有限公司 | Preparation method of copper/aluminum side composite strip |
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