An additive method based on laser shock

Abstract

The application provides an additive method based on laser impact, and relates to the field of additive manufacturing. The additive method based on laser impact comprises the following steps: adopting a laser impact machining method, irradiating a laser beam on a metal foil in a direction perpendicular to the metal foil, making the metal foil impact a base under the action of a laser impact wave, and realizing additive combination of the metal foil and the base through the impact action; wherein the material of the base comprises a metal material. The method can promote close and firm combination between solid metal materials, thereby realizing efficient metal additive manufacturing. The additive manufacturing product prepared by using the method has excellent tensile strength and elongation. In addition, the method has wide applicability and can be flexibly applied to processing of various metal materials, effectively widens the material selection range of traditional alloy powder cladding type additive manufacturing technology, significantly reduces defects in traditional additive manufacturing technology, and improves overall manufacturing quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of additive manufacturing, in particular to an additive method based on laser shock. BACKGROUND

[0002] Metal additive manufacturing technology is a highly forward-looking and innovative manufacturing route, which can play an important role in many key industries such as consumer goods, biomedical devices, automobile parts, national defense weapon development, building materials, microelectronics industry and space technology.

[0003] In the existing metal additive manufacturing technology, the additive manufacturing method assisted by laser shock strengthening has become a technology route that attracts much attention. This method mainly uses alloy powder as the processing material, combines laser shock strengthening with other equipment (selective laser melting or laser powder bed melting), and achieves the purpose of alternating forming and strengthening.

[0004] However, the traditional additive manufacturing technology based on alloy powder cladding has the problems of narrow material selection range and many printing defects. SUMMARY

[0005] The purpose of the present application is to provide an additive method based on laser shock to solve the above problems.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] An additive method based on laser shock, comprising: using a laser shock processing method to irradiate a laser beam on a metal foil coated with a sacrificial layer in a direction perpendicular to the metal foil, so that the metal foil impacts a substrate under the action of laser shock waves, and the additive combination of the metal foil and the substrate is realized through the impact effect; wherein the material of the substrate includes metal; the angle between the metal foil and the substrate is 5-55°; in the laser shock processing method, the energy density of the laser is 4-15 GW / cm 2 .

[0008] According to the embodiment of the present application, the distance between the metal foil and the substrate is 1-10 cm.

[0009] According to the embodiment of the present application, the material of the metal foil includes at least one of titanium alloy, aluminum alloy, copper, and steel.

[0010] The material of the substrate includes any one of titanium alloy, aluminum alloy, copper, and steel.

[0011] According to the embodiment of the present application, the speed of the metal foil impacting the substrate is 200-2000 m / s.

[0012] According to the embodiment of the present application, the thickness of the metal foil is 10-2000 pm.

[0013] According to the embodiment of the present application, the material of the sacrificial layer is polymer or metal.

[0014] The thickness of the sacrificial layer is 50-200 pm.

[0015] According to the embodiment of the present application, the sacrificial layer is provided with a constraint layer away from one side of the metal foil, and the constraint layer is tempered glass or a water flow layer.

[0016] According to the embodiment of the present application, the thickness of the constraint layer is 2-10 mm.

[0017] Compared with the prior art, the beneficial effects of the present application include:

[0018] The method of the present application can promote the close and firm combination between solid metal materials, thereby realizing efficient metal additive manufacturing. The additive manufacturing product prepared by the method of the present application has excellent tensile strength and elongation at the same time. In addition, the method of the present application has wide applicability and can be flexibly applied to the processing of various metal materials, effectively widening the material selection range of traditional alloy powder cladding type additive manufacturing technology, and significantly reducing the defects in traditional additive manufacturing technology, and improving the overall manufacturing quality. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope of the present application.

[0020] Figure 1 The relative position relationship diagram of the metal foil and the substrate in the method of the present application;

[0021] Figure 2 The scanning electron microscope photos and element distribution diagrams of the cross-section microstructure of the multilayer 7075 aluminum alloy material prepared in Example 1;

[0022] Figure 3 The mechanical tensile property diagram of the multilayer 7075 aluminum alloy material prepared in Example 1;

[0023] Figure 4 The solid state connection morphology diagram of the dissimilar metal prepared in Example 2;

[0024] Figure 5 The structure diagram of the additive product prepared in Comparative Example 1;

[0025] Figure 6 The structure diagram of the additive product prepared in Comparative Example 2.

[0026] Reference numerals:

[0027] 100 - metal foil, 200 - substrate, 300 - additive manufacturing sample, 400 - sacrificial layer, 500 - constraining layer, a - angle between metal foil and substrate, A - laser beam, S - distance between metal foil and substrate. DETAILED DESCRIPTION

[0028] As used herein the terms:

[0029] "By" is synonymous with "comprising." The terms "comprising," "including," "containing," "having" or any other similar word, as used herein, are intended to be equivalent to the word "comprising" in that they do not preclude additional, unrecited elements or method steps. The term "consisting essentially of" means that the composition, method or process can include additional unrecited elements or method steps, but only if the additional unrecited elements or method steps do not materially alter the basic and novel characteristics of the claimed composition, method or process.

[0030] The conjunctive word "consisting of' excludes any element, step, or ingredient not specified. If used in the claims, this phrase shall not be construed to mean that the claimed composition, method, or process comprises the only elements or steps specified but shall instead be construed to mean that the only elements or steps of the claimed composition, method, or process are those specified.

[0031] When a range, preferably a range, or a series of upper preferred values and lower preferred values, defines a value, concentration, or other quantity, it should be understood that the disclosure specifically encompasses all ranges formed from any pair of an upper limit or preferred value and a lower limit or preferred value, whether or not the range is expressly disclosed. For example, where a range "1-5" is disclosed, the described range should be interpreted to include ranges "1-4," "1-3," "1-2," "1-2 and 4-5," "1-3 and 5," etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include both the upper and lower values and all integers and fractions within that range.

[0032] In these examples, the parts and percentages are by mass unless otherwise indicated.

[0033] "Quality parts" refers to the basic unit of measurement indicating the mass ratio relationship of multiple components, 1 part can represent any unit mass, such as 1g, 2.689g, etc. If we say that the mass of component A is a part, and the mass of component B is b part, it means that the mass ratio of component A to component B is a:b. Alternatively, the mass of component A is aK, and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that unlike the mass fraction, the sum of the mass fractions of all components is not limited to 100 parts.

[0034] "and / or" is used to indicate that one or both of the described cases can occur, for example, A and / or B includes (A and B) and (A or B).

[0035] In order to better illustrate the technical solutions provided in the present application, before the examples, the technical solutions are stated as a whole, as follows:

[0036] In the process of laser shock processing, nanosecond laser first interacts with the sacrificial layer to produce high-temperature and high-pressure plasma. The plasma expands rapidly, generating a shock wave with a pressure of up to GPa level. This shock wave can act on the surface of the metal material to introduce residual compressive stress and bring about work hardening effect. At the same time, the shock wave generated by the laser can drive the material to obtain a large speed. The inventors found that laser shock technology can achieve the critical speed of realizing material solid-state connection, realizing the connection of solid-state materials.

[0037] The present application provides an additive method based on laser shock, referring to Figure 1 , comprising: using laser shock processing method, irradiating laser beam A to the metal foil 100 coated with sacrificial layer 400 in the direction perpendicular to the metal foil 100, making the metal foil 100 impact the substrate 200 under the action of laser shock wave, realizing the additive combination of the metal foil 100 and the substrate 200 through the impact effect, and obtaining the additive manufacturing sample 300; wherein the material of the substrate 200 includes metal; the angle α between the metal foil and the substrate is 5-55°; in the laser shock processing method, the energy density of the laser is 4-15 GW / cm 2 .

[0038] The method of the present application can tightly bond solid metal materials, realize the additive manufacturing of metal, and the additive manufacturing product obtained by the method of the present application has excellent tensile strength and elongation. Moreover, the method of the present application is suitable for various metal materials, and improves the problems of narrow material selection range and many printing defects of the additive manufacturing technology of traditional alloy powder cladding method.

[0039] According to some embodiments of the present application, before the metal foil is made to impact the substrate under the action of the laser shock wave, the method further comprises: using sandpaper (320-2500 mesh) to polish the surface of the substrate to remove roughness and surface defects. Then the polished substrate is cleaned with alcohol and dried to better achieve the effect of solid-state connection between the substrate material and the metal foil.

[0040] According to embodiments of the present application, referring to Figure 1 , the angle a between the metal foil and the substrate is 5-55°. This angle will directly affect the stress direction and the speed of the metal foil to obtain the optimal collision condition. If the angle a between the metal foil and the substrate is too small, the metal foil will be in contact with the substrate as a whole, leaving voids. If the angle a between the metal foil and the substrate is too large, the speed of the metal foil impacting down is uneven, which will make the metal foil and the substrate material not firmly welded, affecting the connection performance of the welded material.

[0041] For example, the angle a between the metal foil and the substrate can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° or any value between 5-55°.

[0042] According to embodiments of the present application, in the laser shock processing method, the energy density of the laser is 4-15 GW / cm 2 . The energy of the laser beam determines the pressure of the plasma, thereby affecting the speed of the metal foil and ultimately affecting the quality of solid-state connection. Higher laser energy density can produce higher impact speed, and when the energy density of the laser is within the above range, the metal foil can have a higher impact speed, while the substrate and the metal foil are not damaged.

[0043] For example, the energy density of the laser can be 4 GW / cm 2 , 5 GW / cm 2 , 6 GW / cm 2 , 7 GW / cm 2 , 8 GW / cm 2 , 9 GW / cm 2 , 10 GW / cm 2 , 11 GW / cm 2 , 12 GW / cm 2 , 13 GW / cm 2 , 14 GW / cm 2 , 15 GW / cm 2 or any value between 4-15 GW / cm 2 .

[0044] According to embodiments of the present application, the distance S between the metal foil and the substrate is 1-10 cm.

[0045] For example, the distance S between the metal foil and the substrate can be 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, 10 cm, or any value between 1-10 cm.

[0046] According to an embodiment of the present application, the material of the metal foil comprises at least one of titanium alloy, aluminum alloy, copper, and steel.

[0047] The material of the substrate comprises any one of titanium alloy, aluminum alloy, copper, and steel.

[0048] According to an embodiment of the present application, the speed of the metal foil impacting the substrate is 200-2000 m / s. The metal foil impacts the substrate material at high speed under the action of the shock wave, thereby realizing solid-state connection.

[0049] For example, the speed of the metal foil impacting the substrate can be 200 m / s, 300 m / s, 400 m / s, 500 m / s, 600 m / s, 700 m / s, 800 m / s, 900 m / s, 1000 m / s, 1100 m / s, 1200 m / s, 1300 m / s, 1400 m / s, 1500 m / s, 1600 m / s, 1700 m / s, 1800 m / s, 1900 m / s, 2000 m / s, or any value between 200-2000 m / s.

[0050] According to an embodiment of the present application, the thickness of the metal foil is 10-2000 μm. When the thickness of the metal foil is within the above range, the metal foil can maintain good solid-state connection effect, thereby realizing reliable connection. If the thickness of the metal foil is too small, it is easy to melt under laser impact. If the thickness of the metal foil is too large, it cannot obtain sufficient speed to impact the substrate, which is not conducive to the effect of solid-state connection.

[0051] For example, the thickness of the metal foil can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 1100 μm, 1200 μm, 1300 μm, 1400 μm, 1500 μm, 1600 μm, 1700 μm, 1800 μm, 1900 μm, 2000 μm, or any value between 10-2000 μm.

[0052] The thickness of the metal foil can be adjusted according to the melting point of the metal material and the power of the laser. Low-melting-point metal materials and high-power-density lasers can be used for solid-state welding of thicker metal foils, and vice versa.

[0053] According to an embodiment of the present application, referring to Figure 1 The sacrificial layer 400 is located on the side of the metal foil 100 away from the substrate 200, and the material of the sacrificial layer 400 is a polymer or a metal, which is easy to generate a high-temperature plasma. Further, the polymer can be a black organic tape, i.e., a black tape.

[0054] The thickness of the sacrificial layer is 50-200 μm. The sacrificial layer is used to absorb part of the laser energy and generate a plasma, and the material and thickness of the sacrificial layer directly affect the generation efficiency and impact effect of the plasma.

[0055] For example, the thickness of the sacrificial layer can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, or any value between 50-200 μm.

[0056] Through the interaction of the sacrificial layer and the laser beam, the high-temperature and high-pressure plasma generated drives the metal foil, so that the metal foil impacts the substrate material at a very high speed (200-2000 m / s). When the metal foil and the substrate material collide at a high speed, the temperature of the material interface rises, the surface oxide film breaks, and the elements diffuse into each other, thereby realizing the solid-state metallurgical bonding of the metal foil and the substrate material.

[0057] According to an embodiment of the present application, referring to Figure 1 The side of the sacrificial layer 400 away from the metal foil 100 is provided with a constraint layer 500, which is used to limit the propagation direction of the shock wave formed after the plasma expands, so that it can only continue to propagate towards the substrate material.

[0058] According to some embodiments of the present application, the constraint layer is tempered glass or a water flow layer. When the constraint layer is the above-mentioned material, the constraint layer can have good light transmission, ensuring the propagation efficiency of the laser energy.

[0059] According to an embodiment of the present application, the thickness of the constraint layer is 2-10 mm. If the thickness of the constraint layer is too large, it will affect the transmission of the laser energy. If the thickness of the constraint layer is too small, it will weaken the limiting effect on the shock wave.

[0060] For example, the thickness of the constraint layer can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or any value between 2-10 mm.

[0061] The embodiments of the present application will be described in detail below with specific examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be obtained by commercial purchase.

[0062] Example 1

[0063] Example 1 provides a laser shock-based additive method to achieve solid-state connection of the same refractory metal, specifically comprising:

[0064] In Example 1, the base material and the metal foil are both 7075 aluminum alloy, wherein the thickness of the base material is 1 mm and the thickness of the printed metal foil is 20 microns. After polishing the base material with sandpaper, the polished base material and the metal foil are ultrasonically cleaned for 10 minutes to remove surface impurities to ensure the quality of the connection.

[0065] The laser shock processing method is used to process the metal foil and the base, the angle between the metal foil and the base material is adjusted to 35°, the distance between the metal foil and the base is 5 cm, the material of the sacrificial layer is black tape, the thickness of the sacrificial layer is 80 microns, the material of the confinement layer is tempered glass, and the thickness of the confinement layer is 3 mm. The laser energy density is selected to be 4.24 GW / cm 2 at this time the impact velocity of the metal foil is 680 m / s. After the first layer of metal foil is successfully connected, the entire welding is regarded as the base material, and another piece of 7075 aluminum alloy with a thickness of 30 microns is added. By repeating the above steps, a multi-layer solid-state connected aluminum alloy material with a thickness of 3 mm can be obtained. The additive product prepared in Example 1 is shown in Figure 2 , wherein, Figure 2 (a) in the figure is a scanning electron microscope photo of the cross-sectional microstructure of the multi-layer 7075 aluminum alloy material prepared in Example 1, Figure 2 (b) in the figure is an element distribution map of the multi-layer 7075 aluminum alloy material prepared in Example 1.

[0066] As can be seen from Figure 2 , the structure between each layer of 7075 aluminum alloy refractory metal is tight. In addition, the multi-layer 7075 aluminum alloy material prepared in Example 1 is also subjected to tensile test to evaluate the connection strength and performance of the multi-layer 7075 aluminum alloy, and the results are shown in Figure 3 , and Figure 3It can be seen that the tensile strength of the multilayer 7075 aluminum alloy material prepared in Example 1 is 264 MPa, and the elongation reaches 13%. Compared with the tensile strength and elongation of 618 MPa and 6% of the 7075 aluminum alloy mentioned in the journal literature (PANIGRAHI S K, JAYAGANTHAN R. Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy [J]. Journal of Alloy and Compounds, 2011, 509: 9609-9616), the elongation of the multilayer 7075 aluminum alloy material prepared in Example 1 is increased by 2.16 times. The bonding strength of the multilayer 7075 aluminum alloy material prepared in Example 1 is 28 N.

[0067] Example 2

[0068] Example 2 provides a laser shock-based additive method to realize the additive manufacturing of dissimilar metal materials, specifically including:

[0069] The base material in Example 2 is titanium alloy, and the metal foil is 7075 aluminum alloy, brass and pure iron, wherein the thickness of the base material is 1 mm, and the thickness of the metal foil (7075 aluminum alloy, brass and steel) is 30 microns, 50 microns and 30 microns respectively. After polishing the base material with sandpaper, the polished base material and metal foil are ultrasonically cleaned for 10 minutes to remove surface impurities and ensure the quality of the connection.

[0070] The laser shock processing method is used to process the metal foil and the base, the angle between the metal foil and the base material is adjusted to 30°, the distance between the metal foil and the base is 5 cm, the material of the sacrificial layer is black tape, the thickness of the sacrificial layer is 80 microns, and the material of the constraint layer is tempered glass, and the thickness of the constraint layer is 3 mm. The laser energy density is selected to be 7.6 GW / cm 2 , at this time the impact speed of the metal foil is 830 m / s. After the first layer of 7075 aluminum alloy foil is successfully connected, the entire welding is regarded as the base material, and another piece of brass foil with a thickness of 50 microns is added again, and the above steps are repeated. Finally, a piece of steel foil with a thickness of 30 microns is added again, and the above steps are repeated, so that a multilayer solid-state connected dissimilar metal material can be obtained.

[0071] Figure 4 The solid-state connected morphology of the dissimilar metal prepared in Example 2 is shown in Figure 4It can be seen that the structure of the dissimilar metals prepared in Example 2 is compact between the refractory metals of each layer. The bonding strength of the dissimilar metals prepared in Example 2 is 24N.

[0072] Comparative Example 1

[0073] The metal foil and the substrate were treated by laser shock processing. The substrate material was titanium alloy, and the metal foil was 7075 aluminum alloy. The thickness of the substrate material was 1 mm, and the thickness of the metal foil material was 30 μm. The substrate material and the metal foil were ultrasonically cleaned for 10 min to remove surface impurities to ensure the quality of the connection. The angle of the metal foil and the substrate material was adjusted to 30°, the distance between the metal foil and the substrate was 5 cm, the material of the sacrificial layer was black tape, the thickness of the sacrificial layer was 80 μm, and the material of the confinement layer was tempered glass, and the thickness of the confinement layer was 3 mm. The laser energy density was selected to be 15.92 GW / cm 2 At this time, the impact velocity of the metal foil was 1120 m / s.

[0074] Figure 5 The structure diagram of the additive product prepared in Comparative Example 1 is shown in FIG. 6. Figure 5 It can be seen that the metal foil is separated from the substrate material, and the metal foil and the substrate material do not form a tight connection, which may be due to the fact that the metal foil is damaged due to the excessive laser energy density, and partial melting phenomenon occurs. The bonding strength of the additive product prepared in Comparative Example 1 is only 12N.

[0075] Comparative Example 2

[0076] The metal foil and the substrate were treated by laser shock processing. The substrate material was titanium alloy, and the metal foil was 7075 aluminum alloy. The thickness of the substrate material was 1 mm, and the thickness of the metal foil material was 30 μm. The substrate material and the metal foil were ultrasonically cleaned for 10 min to remove surface impurities to ensure the quality of the connection. The angle of the metal foil and the substrate material was adjusted to 30°, the distance between the metal foil and the substrate was 8 cm, the material of the sacrificial layer was black tape, the thickness of the sacrificial layer was 100 μm, and the material of the confinement layer was tempered glass, and the thickness of the confinement layer was 3 mm. The laser energy density was selected to be 3.5 GW / cm 2 At this time, the impact velocity of the metal foil was 400 m / s. In addition, another piece of 7075 aluminum alloy with a thickness of 30 μm was added. By repeating the above steps, a multi-layer solid-state connected aluminum alloy material can be obtained.

[0077] Figure 6 The structure diagram of the additive product prepared in Comparative Example 2 is shown in FIG. 7. Figure 6It can be seen that the metal foil is not tightly connected with the base material, and cracks appear in each layer of the metal foil. This can be caused by the too small laser energy density. The bonding strength of the additive product prepared in Comparative Example 2 is only 8 N.

[0078] Comparative Example 3

[0079] The metal foil and the base are treated by laser shock processing, the base material is titanium alloy, and the metal foil is 7075 aluminum alloy, wherein the thickness of the base material is 1 mm, and the thickness of the metal foil material is 30 μm. The base material and the metal foil are ultrasonically cleaned for 10 min to remove surface impurities to ensure the quality of the connection. The angle of the metal foil and the base material is adjusted to 0°, the distance between the metal foil and the base is 8 cm, the material of the sacrificial layer is black tape, the thickness of the sacrificial layer is 80 μm, and the material of the confinement layer is tempered glass, and the thickness of the confinement layer is 3 mm. The laser energy density is selected to be 7.6 GW / cm 2 , at this time the impact velocity of the metal foil is 830 m / s. In addition, a piece of 7075 aluminum alloy with a thickness of 30 μm is added again. By repeating the above steps, a multi-layer solid-state connected aluminum alloy material can be obtained. In Comparative Example 3, the structure between each layer of 7075 aluminum alloy refractory metal is relatively loose compared to Example 2, and the tight bonding strength of the additive product prepared in Comparative Example 3 is only 17 N.

[0080] Comparative Example 4

[0081] The metal foil and the base are treated by laser shock processing, the base material is titanium alloy, and the metal foil is 7075 aluminum alloy, wherein the thickness of the base material is 1 mm, and the thickness of the metal foil material is 30 μm. The base material and the metal foil are ultrasonically cleaned for 10 min to remove surface impurities to ensure the quality of the connection. The angle of the metal foil and the base material is adjusted to 60°, the distance between the metal foil and the base is 10 cm, the material of the sacrificial layer is black tape, the thickness of the sacrificial layer is 80 μm, and the material of the confinement layer is tempered glass, and the thickness of the confinement layer is 3 mm. The laser energy density is selected to be 7.6 GW / cm 2 , at this time the impact velocity of the metal foil is 830 m / s. In addition, a piece of 7075 aluminum alloy with a thickness of 30 μm is added again. By repeating the above steps, a multi-layer solid-state connected aluminum alloy material can be obtained. In Comparative Example 4, the structure between each layer of 7075 aluminum alloy refractory metal is relatively loose compared to Example 2, and the tight bonding strength of the additive product prepared in Comparative Example 4 is only 14 N.

[0082] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, but not limiting the technical solutions of the present application; even though the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0083] Furthermore, those skilled in the art will appreciate that a combination of features from different embodiments can be meant to be within the scope of the present application and form a different embodiment, although some embodiments herein include certain features rather than others included in other embodiments. For example, in the claims above, any of the claimed embodiments can be used in any combination. The information disclosed in this Background section is only intended to deepen the understanding of the general background of the present application, and should not be considered as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A laser shock based additive method, characterized in that, The application relates to a method for manufacturing a metal foil and a substrate by laser shock processing. The method comprises the following steps: The material of the substrate comprises metal; the angle between the metal foil and the substrate is 5-55°; in the laser shock processing method, the energy density of the laser is 4-15 GW / cm 2 ; A laser beam is irradiated on a metal foil coated with a sacrificial layer in a direction perpendicular to the metal foil, so that the metal foil impacts a substrate under the action of a laser shock wave, and additive combination of the metal foil and the substrate is realized through the impact.

2. Laser shock based additive method according to claim 1, characterized in that, The speed of the metal foil impacting the substrate is 200-2000 m / s.

3. The laser shock based additive method of claim 1, wherein, The distance between the metal foil and the substrate is 1-10 cm. The material of the metal foil comprises at least one of titanium alloy, aluminum alloy, copper and steel.

4. The laser shock based additive method of claim 1, wherein, The material of the substrate comprises any one of titanium alloy, aluminum alloy, copper and steel.

5. The laser shock based additive method of claim 1, wherein, The thickness of the metal foil is 10-2000 mu m.

6. The laser shock based additive method of claim 1, wherein, The material of the sacrificial layer is polymer or metal.

7. The laser shock based additive method of claim 5, wherein, The thickness of the sacrificial layer is 50-200 mu m.

8. The laser shock based additive method of claim 7, wherein, A constraint layer is arranged on the side of the sacrificial layer far from the metal foil.

9. Laser shock based additive method according to claim 7 or 8, characterized in that, The constraint layer is tempered glass or a water flow layer. The thickness of the constraint layer is 2-10 mm.

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