CN110732768B - Same kind/dissimilar metal connection forming method based on amorphous alloy - Google Patents

Same kind/dissimilar metal connection forming method based on amorphous alloy Download PDF

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CN110732768B
CN110732768B CN201910892037.2A CN201910892037A CN110732768B CN 110732768 B CN110732768 B CN 110732768B CN 201910892037 A CN201910892037 A CN 201910892037A CN 110732768 B CN110732768 B CN 110732768B
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amorphous alloy
metal
base material
metal base
alloy
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CN110732768A (en
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龚攀
殷更
王新云
邓磊
金俊松
张茂
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Huazhong University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/008—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating pressure combined with radiant energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/24—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/26—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials

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  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention belongs to the field of connection forming of amorphous alloy and metal materials, and particularly relates to a connection forming method between same-type/dissimilar metals based on amorphous alloy. Firstly, roughening the surfaces of two metal base materials, then placing amorphous alloy between the two roughened metal base materials to obtain a sandwich composite structure, firstly pressurizing the composite structure, then heating the composite structure, finally preserving heat and pressure for a certain time, and connecting the same kind/different kind of metal base materials by using the amorphous alloy as a medium. The invention can be used for connecting the same kind of metal materials or different kinds of metal materials which are difficult to weld, and overcomes the problem of difficult connection of the same kind of/different kinds of materials.

Description

Same kind/dissimilar metal connection forming method based on amorphous alloy
Technical Field
The invention belongs to the field of amorphous alloy and metal material connection forming, and particularly relates to an amorphous alloy-based same/dissimilar metal connection forming method.
Background
The amorphous alloy has mechanical, physical and chemical properties obviously superior to those of the traditional crystalline materials due to the unique amorphous structure. Such as high strength, good wear and corrosion resistance, and the amorphous alloy can exhibit superplasticity in the supercooled liquid region, a characteristic that enables the amorphous alloy to be subjected to thermoplastic forming.
At present, a large number of dissimilar metal-joined piping structures (connections between titanium alloys, aluminum alloys, and stainless steel) are employed in aerospace propulsion systems and aircraft engines. The physical and chemical properties of dissimilar alloys are very different, and the requirements for connection are relatively strict. Conventional mechanical joining and gluing have several disadvantages, such as low strength, high structural mass, excess material during gluing, etc. The conventional fusion welding method, however, is prone to the following problems: 1) metallurgical incompatibility, forming brittle compound phase at the interface; 2) thermo-physical property mismatch, resulting in residual stress; 3) the mechanical property difference is large, so that the mechanical mismatch of the connection interface generates serious stress singular behaviors. Therefore, the material connection is difficult, the structure, the performance and the mechanical behavior of the welding joint are influenced, the fracture performance and the reliability of the joint are adversely affected, and the structural integrity is even seriously affected.
With the expanding application prospect of the dissimilar material connection structure, the connection technology will be more and more emphasized. The selection of the connection method is determined according to different material combinations, different structural shapes and different application environments. The brazing technology is the most important method for connecting dissimilar materials at present, and other methods have respective limitations. Melt brazing, electron beam brazing, laser brazing, active soldering, friction stir welding, and the like are new methods developed in recent years, and are still under study in connection of dissimilar materials.
Today, new technologies are continuously developed, more and more connecting technologies are suitable for dissimilar material combination, and the continuous development of the new technologies provides new technical support for the connection of dissimilar materials. And the technologies of explosion welding, cold-rolling welding, ultrasonic welding, friction stir welding, friction welding and the like based on the amorphous alloy plastic deformation are rapidly developed. However, amorphous alloy joints are required to overcome the problem at the joint interface and avoid the crystallization at the joint of the metal alloy and the amorphous alloy.
At present, most of connection forming methods based on amorphous alloys have higher temperature than Tx (initial crystallization temperature of amorphous alloy) of amorphous alloy during welding, so that the amorphous alloy is crystallized, the amorphous alloy is embrittled, and the strength of a joint is lowered. Patent CN103286473A "a TiZr-based amorphous alloy solder with low Cu and Ni content and its preparation method" discloses a TiZr-based amorphous alloy solder with low Cu and Ni content and its preparation method, which can be used for connecting titanium alloy, titanium aluminum alloy itself or dissimilar materials. The brazing filler metal prepared by the method can still be heated to be above the liquidus line of the material during connection, so that the amorphous alloy brazing filler metal is crystallized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the amorphous alloy connection forming method which fully combines the characteristics and the requirements of the amorphous alloy and the crystalline material, and the amorphous alloy and crystalline material connection forming method is newly designed in a pertinence way, so that a better connection composite structure is correspondingly obtained. The amorphous alloy is used as an intermediate medium to connect the same or different metal alloys, the heating temperature is between supercooling liquid phase regions (Tg-Tx) of the amorphous alloy, the amorphous structure of the amorphous alloy can be kept, and the parent metal is not subjected to phase change, so that the technical problems of difficult connection forming, insufficient bonding strength, complex process and the like of the existing different materials are solved.
In order to achieve the above object, according to one aspect of the present invention, there is provided an amorphous alloy-based homogeneous/dissimilar metal joining forming method, comprising the steps of:
(1) roughening the surfaces of a first metal substrate and a second metal substrate to be connected by a physical or chemical method to enable scratches and/or pits to appear on the surfaces of the first metal substrate and the second metal substrate to be connected, so as to obtain the first metal substrate and the second metal substrate to be connected, which are subjected to surface roughening treatment;
(2) placing amorphous alloy between the first metal substrate and the second metal substrate which are subjected to surface roughening treatment and are to be connected to obtain a composite structure, applying pressure to the composite structure, heating to a temperature range of a supercooled liquid phase region of the amorphous alloy, preserving heat and maintaining pressure for a certain time to enable the amorphous alloy to be fully pressed into pits or scratches on the surfaces of the first metal substrate and the second metal substrate which are subjected to roughening treatment, and finally cooling the composite structure to room temperature in a furnace;
the first metal base material and the second metal base material are single metal or metal alloy, and the first metal base material and the second metal base material are the same kind of metal or different kind of metal base material.
Preferably, the physical or chemical method is electrochemical etching, machining, pulsed laser or sanding.
Preferably, the roughening treatment further comprises a cleaning step, wherein the surface of the first metal substrate and the surface of the second metal substrate which are subjected to the roughening treatment and are to be connected are cleaned, so that surface stains are removed.
Preferably, the critical dimension of the amorphous alloyD c >20 mm, supercooled liquid phase temperature interval deltaT x >50K, index of thermoplastic formabilityS>0.15。
Preferably, the wetting angle of the first metal substrate with the selected amorphous alloy is less than 90 °, and the wetting angle of the second metal substrate with the selected amorphous alloy is less than 90 °.
Preferably, the magnitude of the pressure applied in step (2) is lower than the yield strength of the first metal substrate and the second metal substrate at that temperature.
Preferably, the heating temperature in the step (2) is between the glass transition temperature of the amorphous alloyT g And initial crystallization temperatureT x In the meantime.
Preferably, the heating temperature of step (2) is lower than the phase transition temperature of the first metal substrate and lower than the phase transition temperature of the second metal substrate.
Preferably, before the heating in the step (2), the furnace is vacuumized, and then argon protective gas is introduced.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the invention provides a method for connecting amorphous alloys with dissimilar metal substrates by combining the thermoplastic forming performance of the amorphous alloys. Firstly, pressurizing the composite structure, then heating the composite structure, and finally, preserving heat and pressure for a certain time to connect the amorphous alloy and the same or different metal base materials. Compared with common dissimilar metal connection methods, such as pressure welding, brazing and the like, the method has better connection forming effect. The contact surface of the amorphous alloy and the metal or the metal alloy is formed by connecting under the condition of applying constant and uniform pressure, the connecting effect of each position is uniform, and no obvious defect exists.
(2) When the amorphous alloy is used for connecting the same or different metal base materials, a weld heat affected zone which is generated by a common connecting and forming method does not exist, a weak zone does not exist in a connecting and forming piece, and the service effect of the connecting and forming piece is better.
(3) The method utilizes the thermoplastic property of the amorphous alloy in the supercooling liquid phase region, can easily connect the same kind/different kind of metal, and the bonding strength of the two kinds of metal alloy is better, the peel strength (the angle when peeling is 180 degrees) measured in one embodiment is about: 30.18N/m, and can meet the requirements of daily engineering structural members. Filling the surface roughened hollow structure with amorphous superplasticity is an important factor for improving the bonding strength.
(4) The method utilizes the amorphous alloy as a medium to connect the dissimilar metals, utilizes the superplasticity of the amorphous alloy in a supercooled liquid phase region and has a lower thermal expansion coefficient due to the excellent performances of the amorphous alloy such as high strength, high hardness and the like, can connect the dissimilar metals at a temperature far lower than that of the traditional connection forming technology, and can not reach the phase transformation point of most metal materials in the connection process, such as: the phase transition temperature of pure titanium is 885 ℃, the phase transition temperature of titanium alloy TC4 is 998 ℃, and the phase transition temperature of stainless steel SS304 is more than 1000 ℃, so that the structural performance of the parent metal is more stable, and the quality of the obtained connected piece is better.
(5) The method treats the surface of the amorphous alloy, increases the surface roughness of the amorphous alloy, is more beneficial to the combination of the amorphous alloy and the metal material at the interface, and can well overcome the problem of the combination of the metal alloy at the interface in the connection forming process.
(6) The invention provides a novel dissimilar metal connection method. The superplasticity of the amorphous alloy in the supercooling liquid phase region is utilized to heat and pressurize the amorphous alloy, so that the amorphous structure of the amorphous alloy can be maintained, the original performance of the parent metal is maintained, and the connecting forming piece with stable performance and structure is obtained. The heating temperature adopted by the invention is between the supercooling liquid phase region (Tg-Tx) of the amorphous alloy, so that the material is not crystallized, the excellent performance of the amorphous alloy is kept, and the amorphous alloy and metal have good bonding strength at the bonding position.
Drawings
FIG. 1 is a flow chart of a method constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention in example 1;
FIG. 3 is a time-temperature curve during heating in example 1 of the present invention;
FIG. 4 is a time-pressure curve during pressurization of example 1 of the present invention.
Detailed Description
In order to clearly understand the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention is made with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described initially are merely illustrative of the invention and do not limit the invention. In addition, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for connecting and forming an amorphous alloy and a metal material. The method comprises the following steps:
(1) roughening the surfaces of a first metal substrate and a second metal substrate to be connected by a physical or chemical method to enable scratches and/or pits with different depths to appear on the surfaces of the first metal substrate and the second metal substrate to be connected, so as to obtain the first metal substrate and the second metal substrate to be connected, which are subjected to surface roughening treatment;
(2) placing amorphous alloy between the first metal substrate and the second metal substrate which are subjected to surface roughening treatment and are to be connected to obtain a composite structure, applying pressure to the composite structure, heating to a temperature range of a supercooled liquid phase region of the amorphous alloy, preserving heat and maintaining pressure for a certain time to enable the amorphous alloy to be fully pressed into pits or scratches on the surfaces of the first metal substrate and the second metal substrate which are subjected to roughening treatment, and finally cooling the composite structure to room temperature in a furnace;
the first metal base material and the second metal base material are single metal or metal alloy, and the first metal base material and the second metal base material are the same kind of metal or different kind of metal base material.
The condition of surface treatment of the first metal base material and the second metal base material to be connected is directly related to the quality of the connected forming piece. The surface of the first metal substrate and the second metal substrate to be joined is treated by physical or chemical methods as described in step (1), and various physical or chemical methods for metal surface treatment such as electrochemical etching, machining, pulse laser or sanding may be used. The treatment may be followed by pits or scratches of varying depth to facilitate subsequent bonding to the amorphous alloy.
In a preferred embodiment, the size of the base material, i.e. the first metal substrate and the second metal substrate to be joined, is generally chosen to match the size of the amorphous alloy sample.
After the surfaces of the first metal substrate and the second metal substrate to be connected are roughened, in a preferred embodiment, the treated surfaces are further cleaned, for example, by ultrasonic cleaning, to remove surface stains. The sample is subjected to ultrasonic cleaning to remove stains on the surface, so that the impurities on the surface are prevented from influencing the combination at the interface.
The first metal substrate and the second metal substrate may be the same metal or alloy, or may be different metals or metal alloys.
In some embodiments of the invention, theThe component type selection standard of the amorphous alloy is as follows: high amorphous forming ability and critical size of amorphous alloyD c >20 mm (the critical dimension of the amorphous alloy is the maximum obtainable dimension when the amorphous alloy of the system is prepared); the size of the amorphous alloy material is determined according to the forming capability and the thermoplastic forming capability of the amorphous alloy material. Good thermal stability, supercooling liquid phase temperature range deltaT x >50K, preferably more than 80K, whereT x =T x -T g ，T x The temperature of the initial crystallization is the temperature of the initial crystallization,T g is the glass transition temperature. The amorphous alloy adopted has larger supercooling liquid phase region range, deltaT x >And 50K, and enough time is left for pressure maintaining. Excellent in thermoplastic formability, i.e., index of thermoplastic formabilityS>0.15 of whereinS=ΔT x /(T L -T g )，T L Liquidus temperature, such as Zr-based amorphous alloy, Cu-based amorphous alloy, etc.
The amorphous alloy form of the present invention may be a thin strip (plate) or a powder.
In addition, in a preferred embodiment, the wetting angle of the parent metal of the first metal substrate and the parent metal of the second metal substrate to be connected with the selected amorphous alloy is less than 90 degrees, and the smaller the wetting angle of the parent metal and the amorphous alloy is, the closer the chemical property and chemical combination mode of the amorphous alloy and the parent metal are shown, so that the combination of the parent metal and the amorphous alloy at the interface is facilitated,
the composite structure in the step (2) is firstly applied with a certain pressure and then heated. The magnitude of the applied pressure of step (2) is less than, preferably less than and close to, the yield strength of the first and second metal substrates at that temperature.
The specific heating temperature of the amorphous alloy in the supercooled liquid region is determined according to the actual fluidity of the material. The specific heating temperature can be measured according to the DSC curve of the amorphous alloy. Step (ii) of(2) The heating temperature is between the glass transition temperature of the amorphous alloyT g And initial crystallization temperatureT x Preferably, the heating rate is in consideration of the thermal expansion coefficient of the material, and is preferably below the phase transition point of the composite structure.
When the temperature of the composite structure is heated toT g AndT x and maintaining the composite structure at the temperature for a sufficient time to enable the amorphous alloy to be fully combined with the upper and lower metal substrates. And maintaining the pressure for a certain time (ensuring that the amorphous alloy is selected for a longer time under the condition of no crystallization according to the DSC curve of the amorphous alloy), so that the amorphous alloy can be fully pressed into the surface pits or scratches of the upper metal substrate and the lower metal substrate.
In some embodiments, the amorphous alloy has sufficient contact surfaces with the first metal substrate and the second metal substrate, and a sufficient margin is left for performing the peel strength test.
In some embodiments, the composite structure is heated and pressurized by a hot-pressing sintering furnace, and the heating rate is controlled, so that the temperature control and the pressure control are accurate.
In some embodiments, after the composite structure sample is heated and pressurized, the furnace is cooled to room temperature, so as to avoid the phenomenon that the two materials with different thermal expansion coefficients crack at the joint due to the too high cooling speed in the cooling process.
In some preferred embodiments, the furnace is vacuumized before heating, and then argon protective gas is introduced to reduce the influence caused by oxidation during heating.
The selection of the amorphous alloy category of the invention is determined according to the alloy elements of the first metal base material and the second metal base material to be connected, and the amorphous alloy has the elements of the base material components, so that the amorphous alloy is more favorable for being combined with the base material.
The connection forming method provided by the invention can connect the amorphous alloy and the same/different metal or metal alloy, has good connection quality, the amorphous alloy can fully permeate into holes or scratches on the surface of the metal alloy, the peel strength after connection can reach 30.18N/m, and the performance is good.
The metal alloy is connected by heating and pressurizing, and different from the traditional welding process, the welding process has no obvious heat affected zone, so that the material has uniform performance at the joint and has no obvious defect.
The method only needs to heat to the temperature range of the supercooled liquid region in the heating process, the heating temperature is lower and can be lower than the phase change point temperature of the base metal, the original performance of the base metal cannot be changed, and the obtained connected forming piece has stable performance and structure.
In the preferred embodiment, the temperature is only heated to the temperature range of the supercooled liquid region of the amorphous alloy, and the heating and the pressurizing are carried out under the vacuum argon protective gas, so that the amorphous alloy is not crystallized, and the structural performance of the amorphous alloy is stable.
In some specific preferred embodiments, the present invention provides a method for forming a same/different metal by using an amorphous alloy, comprising the following steps:
(1) the method comprises the steps of utilizing a titanium alloy, a copper alloy and an amorphous alloy obtained by linear cutting, utilizing modes of mechanical treatment, electrochemical corrosion, abrasive paper polishing and the like to polish the surfaces of the titanium alloy and the copper alloy to obtain scratches and holes with obvious different depths on the surfaces, and ensuring that the scratches and the holes on the surfaces are deep enough when the surfaces of the titanium alloy and the copper alloy are treated so as to facilitate the connection between the alloys.
(2) The selection standard of the component types of the selected amorphous alloy is as follows: high amorphous forming ability and critical forming sizeD c >20 mm; good thermal stability, temperature delta of supercooled liquid regionT X >80K. Wherein ΔT x =T x -T g ，T x The temperature of the initial crystallization is the temperature of the initial crystallization,T g is the glass transition temperature; excellent in thermoplastic formability, i.e., index of thermoplastic formabilityS>0.15 of whereinS=ΔT x /(T L -T g )，T L Is the liquidus temperature. Such as Zr-based, Cu-based, etc.
(3) And (2) carrying out hot pressing treatment on the sample in the step (1), placing the sample as shown in figure 2, firstly pressurizing to 10KN, then heating to 400 ℃, and finally maintaining the pressure at 400 ℃ for 60 min. And obtaining the amorphous alloy connected dissimilar metal forming piece.
The amorphous alloy, the titanium alloy and the copper alloy are selected from plates with the size of 2 x 10 x 20 mm so as to be convenient for peel strength test, all samples are obtained by wire cutting, and then the surfaces of the samples are subjected to ultrasonic cleaning to remove stains so as to avoid affecting the combination of the interface.
The invention belongs to the technical field of amorphous alloy connection forming and thermoplastic forming, and particularly relates to a forming method for connecting amorphous alloy with dissimilar metal. Firstly, roughening the surfaces of two metal base materials, then placing amorphous alloy between the two roughened metal base materials to obtain a composite structure with a sandwich structure, firstly pressurizing the composite structure, then heating the composite structure, finally preserving heat and maintaining pressure for a certain time, and connecting the same kind of metal alloy by using the amorphous alloy as a medium. The invention can be used for connecting the same kind of metal materials or different kinds of metal materials which are difficult to weld, and overcomes the problem of difficult connection of the same kind of/different kinds of materials.
The method takes the amorphous alloy as an intermediate medium for two different metal alloys after surface roughening treatment, and heats the amorphous alloy to a supercooling liquid phase region to connect dissimilar metals. By processing the surfaces of different metal materials and selecting proper heating time and applied pressure, the dissimilar metal pieces can be connected. The problem of forming the connection between dissimilar metals has been a hot spot and a difficult point in the welding field. The development of dissimilar metal joining is hindered by some inherent problems of dissimilar metal joining, such as the composition and performance of a dissimilar metal fusion zone, and the destruction of a dissimilar metal welded structure mostly occurs in the fusion zone, and a transition layer with poor performance and component change is easily formed due to different crystallization characteristics of welding seams on sections close to the fusion zone. For example: in the fusion welding, a part of the base material is always melted into the weld bead to cause dilution, and in addition, intermetallic compounds, eutectic crystals, and the like are formed. Resulting in insufficient strength of the bonded area; for pressure welding, most pressure welding methods have certain requirements on joint forms, such as spot welding, seam welding and ultrasonic welding, and lap joints are required; at least one workpiece must have the cross section of the rotating body during friction welding; explosion welding is only suitable for connection of large areas, etc. Pressure welding equipment is not yet widespread. These undoubtedly limit the range of application of the bonding. Compared with the connecting method of common dissimilar parts. For example: pressure welding, brazing, fusion welding and the like, and the amorphous alloy is connected with dissimilar metal parts by utilizing the thermoplastic property of the amorphous alloy, so that the stress concentration at the welding joint can be reduced. The method for connecting and forming can overcome the problem of weld heat affected zone of the bonding area of two metals and amorphous alloy, thereby overcoming the problem of insufficient strength of the welding area and better controlling the brittle substance layer of the bonding area of the metal piece. In a preferred embodiment, the peel strength of the resulting joined part is up to 30.18N/m.
The following are specific examples:
example 1
FIG. 1 is a flow chart of a method constructed in accordance with a preferred embodiment of the present invention. As shown in fig. 1, the method for connecting dissimilar metals by amorphous alloy comprises the following steps:
step (1): preparing titanium alloy, copper alloy and amorphous alloy Vit1 with required size of 2 × 10 × 20 mm by wire cutting, wherein the critical forming size of the amorphous alloy Vit1 is more than 20 mm, and the glass transition temperature is aboutT g =350 ℃ initial crystallization temperatureT x =432 ℃, liquidus temperatureT L Over-cooling liquid phase interval delta of =744 DEG CT x =82 ℃ index for thermoplastic formingS=ΔTx/（T L -T g ) = 0.263. Then, polishing one surface of the titanium alloy and the copper alloy by using No. 100 abrasive paper to obtain holes or scratches with obviously different depths on the surface, and finally removing stains on the surface of the material by ultrasonic cleaning;
step (2), the titanium alloy, the copper alloy and the amorphous alloy Vit1 are placed in the manner shown in fig. 2, and are subjected to heat and pressure treatment. FIG. 2 is a schematic view of a) a connection structure; b) the contact interface of the amorphous alloy and the metal alloy is locally enlarged, wherein a white area is a pit obtained by roughening the metal material; c) the contact interface of the amorphous alloy and the metal alloy is locally enlarged when the connection is finished, wherein the pits on the surface of the metal material are filled with the amorphous alloy. Fig. 3 is a time-temperature curve during the heating process, and fig. 4 is a time-pressure curve during the pressurization process. The material was pressurized to 10KN and held at that pressure, heated to 400 ℃ at a rate of 15 ℃/min, held at 400 ℃ for 60min, and finally furnace cooled to room temperature for peel strength testing.
The measured peel strength is about 30.18N/m, the bonding strength is better, and the method is suitable for the connection forming between dissimilar metals.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (3)

1. A dissimilar metal connection forming method based on amorphous alloy is characterized by comprising the following steps:
(1) roughening the surfaces of a first metal base material and a second metal base material to be connected by a physical or chemical method to enable pits to appear on the surfaces of the first metal base material and the second metal base material to be connected, so as to obtain the first metal base material and the second metal base material to be connected, wherein the first metal base material and the second metal base material are subjected to surface roughening treatment; the physical or chemical method is electrochemical corrosion, mechanical processing or pulse laser; the first metal base material is a titanium alloy plate; the second metal base material is a copper alloy plate; the cross section of the pit has the shape characteristics of large inside and small outside; the wetting angle of the first metal substrate and the selected amorphous alloy is less than 90 degrees, and the wetting angle of the second metal substrate and the selected amorphous alloy is less than 90 degrees;
(2) placing amorphous alloy between the first metal base material and the second metal base material which are subjected to surface roughening treatment and are to be connected to obtain a composite structure, applying pressure to the composite structure, firstly pressurizing the material to 10KN, keeping the pressure all the time, enabling the amorphous alloy to be fully pressed into surface pits of the first metal base material and the second metal base material which are subjected to roughening treatment, then heating to 400 ℃ at a heating rate of 15 ℃/min, keeping the temperature at 400 ℃ for 60min, and finally cooling the composite structure to room temperature;
the amorphous alloy is an amorphous alloy strip or plate; the amorphous alloy is Vit 1; critical dimension of the amorphous alloyD c >20 mm, supercooled liquid phase temperature interval deltaT x >50K, index of thermoplastic formabilityS>0.15; the bonding strength of the pits obtained by surface roughening is improved by filling amorphous alloy superplasticity.
2. The connection forming method according to claim 1, further comprising a cleaning step of cleaning the surfaces of the first metal substrate and the second metal substrate to be connected, which have been subjected to the surface roughening treatment, to remove surface stains.
3. The joint forming method according to claim 1, wherein the furnace is vacuumized before heating in step (2), and then argon gas is introduced.
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