CN115652303A - Magnesium-lithium alloy part and preparation method thereof, composite reinforced coating and head-mounted equipment - Google Patents
Magnesium-lithium alloy part and preparation method thereof, composite reinforced coating and head-mounted equipment Download PDFInfo
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- CN115652303A CN115652303A CN202211327284.6A CN202211327284A CN115652303A CN 115652303 A CN115652303 A CN 115652303A CN 202211327284 A CN202211327284 A CN 202211327284A CN 115652303 A CN115652303 A CN 115652303A
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- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 133
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 133
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 238000000576 coating method Methods 0.000 title claims abstract description 16
- 239000011248 coating agent Substances 0.000 title claims abstract description 14
- 239000002131 composite material Substances 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 230000007704 transition Effects 0.000 claims abstract description 131
- 238000005728 strengthening Methods 0.000 claims abstract description 94
- 239000000758 substrate Substances 0.000 claims abstract description 49
- 239000011159 matrix material Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000007769 metal material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 36
- 238000011282 treatment Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 29
- 238000000151 deposition Methods 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 19
- 238000004140 cleaning Methods 0.000 claims description 12
- 230000004913 activation Effects 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000009713 electroplating Methods 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 6
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 6
- 238000005238 degreasing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 4
- 229910001096 P alloy Inorganic materials 0.000 claims description 4
- 229910001080 W alloy Inorganic materials 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- MOWMLACGTDMJRV-UHFFFAOYSA-N nickel tungsten Chemical compound [Ni].[W] MOWMLACGTDMJRV-UHFFFAOYSA-N 0.000 claims description 4
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims 1
- 238000000227 grinding Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 193
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- 230000035882 stress Effects 0.000 description 14
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- 239000000243 solution Substances 0.000 description 9
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- 239000002184 metal Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
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- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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Abstract
The invention discloses a magnesium-lithium alloy part and a preparation method thereof, a composite reinforced coating and head-mounted equipment. The magnesium-lithium alloy part comprises a magnesium-lithium alloy substrate, a transition layer and a strengthening layer, wherein the transition layer is arranged on one surface of the magnesium-lithium alloy substrate; the strengthening layer is arranged on the surface of the transition layer, which is far away from the magnesium-lithium alloy matrix; the transition layer and the strengthening layer are both made of metal materials, the material strength of the transition layer is smaller than that of the strengthening layer, and the grain size of the strengthening layer is reduced in the direction from the magnesium-lithium alloy matrix to the transition layer. The technical scheme of the invention can improve the structural strength of the magnesium-lithium alloy piece with high efficiency and low cost.
Description
Technical Field
The invention relates to the technical field of magnesium-lithium alloy strengthening, in particular to a magnesium-lithium alloy part and a preparation method thereof, a composite strengthening coating and head-mounted equipment.
Background
Wearable AR/VR products are widely concerned about because small and powerful, portable and experience and feel well. Since the head of a human body is highly sensitive to the weight of a wearing product, a slim product form is very critical. Among them, magnesium-lithium alloys have great potential in this field due to their unique advantage of extremely low density. However, since the crystal structure of the magnesium-lithium alloy is body-centered cubic, the magnesium-lithium alloy has high plasticity but low strength, and the magnesium-lithium alloy can be aged and softened when placed at room temperature, which severely limits the wide application of the magnesium-lithium alloy.
The existing methods for improving the mechanical properties of the magnesium-lithium alloy have two types, one is to change the chemical components of the magnesium-lithium alloy, add alloy elements with certain content, and strengthen the magnesium-lithium alloy by using mechanisms such as solid solution strengthening, second phase strengthening and the like, but the method needs a large amount of component design and optimization, has large investment and higher cost, and simultaneously still has the core problem of difficult avoiding of aging softening. The other type is that plastic deformation is used for refining crystal grains for strengthening, temperature rise is easily generated in the deformation process to enable the crystal grains of the magnesium-lithium alloy to grow, the strengthening effect is limited, meanwhile, the refined crystal grains can enable the size of a second phase in the magnesium-lithium alloy to be reduced, the growing tendency is more obvious, the effect of aging softening is more serious, and finally the strength improvement effect of the magnesium-lithium alloy caused by plastic deformation is limited.
Disclosure of Invention
The invention mainly aims to provide a magnesium-lithium alloy part, and aims to obtain a low-cost and high-efficiency strengthened magnesium-lithium alloy.
In order to achieve the above object, the present invention provides a magnesium-lithium alloy part comprising:
a magnesium lithium alloy matrix;
the transition layer is arranged on one surface of the magnesium-lithium alloy matrix; and
the strengthening layer is arranged on the surface of the transition layer, which is deviated from the magnesium-lithium alloy matrix;
the transition layer and the strengthening layer are both made of metal materials, the material strength of the transition layer is smaller than that of the strengthening layer, and the grain size of the strengthening layer is reduced in the direction from the magnesium-lithium alloy matrix to the transition layer.
In an alternative embodiment, the grain size of the strengthening layer on the side near the transition layer is the same as the grain size of the transition layer.
In alternative embodiments, the thickness of the strengthening layer ranges from 14 μm to 16 μm;
and/or the thickness range of the transition layer is 4-6 μm.
In an optional embodiment, the material of the transition layer is one of copper, aluminum or zinc;
and/or the material of the strengthening layer is one of nickel, nickel-phosphorus alloy, nickel-molybdenum alloy and nickel-tungsten alloy.
The invention also provides a preparation method, which comprises the following steps:
providing a magnesium-lithium alloy matrix, and pretreating the magnesium-lithium alloy matrix;
depositing a transition layer on one surface of the magnesium-lithium alloy matrix, wherein the transition layer is made of a metal material;
carrying out first heat treatment;
depositing a strengthening layer on the surface of the transition layer, and gradually reducing the grain size of the deposited strengthening layer in the direction from the magnesium-lithium alloy substrate to the transition layer, wherein the strengthening layer is made of a metal material, and the material strength of the strengthening layer is greater than that of the transition layer;
and carrying out secondary heat treatment.
In an optional embodiment, a magnesium-lithium alloy substrate is provided, and the pretreatment step of the magnesium-lithium alloy substrate is specifically:
carrying out oil removal treatment on the surface of the magnesium-lithium alloy matrix;
carrying out activation treatment on the surface of the magnesium-lithium alloy matrix;
and cleaning the surface of the magnesium-lithium alloy matrix again.
In an alternative embodiment, the pre-treatment operation comprises mechanical treatment and/or chemical treatment, wherein the mechanical treatment comprises polishing or wiping, and the chemical treatment comprises chemical degreasing or chemical alkaline cleaning.
In an optional embodiment, the deposition mode in depositing the transition layer on one surface of the magnesium-lithium alloy substrate is electroplating or magnetron sputtering;
and/or the deposition mode of depositing the strengthening layer on the surface of the transition layer is electroplating or magnetron sputtering.
In an alternative embodiment, after the step of performing the first heat treatment and before the step of depositing the strengthening layer on the surface of the transition layer, the method further includes the steps of:
and carrying out oxide removal treatment on the surface of the transition layer.
In an optional embodiment, the heating temperature in the first heat treatment and the second heat treatment is 150-250 DEG C ， The heating time is 0.5 h-2 h.
The invention also provides a composite reinforced coating, which comprises a transition layer and a reinforcing layer which are arranged in a stacking manner, wherein the transition layer and the reinforcing layer are both made of metal materials, the material strength of the transition layer is smaller than that of the reinforcing layer, and the grain size in the reinforcing layer is gradually reduced from the direction close to the transition layer to the direction far away from the transition layer.
The invention also provides a head-mounted device which comprises a shell, wherein the shell is made of the magnesium-lithium alloy part.
According to the technical scheme, the laminated transition layer and the laminated strengthening layer are arranged on the magnesium-lithium alloy substrate, the transition layer and the strengthening layer are made of metal materials, the strength of the transition layer and the strength of the strengthening layer are high, and the strength of the transition layer is smaller than that of the strengthening layer, so that the transition layer and the strengthening layer can be used as an intermediate layer to achieve a good combination effect, and the strain coordination capability between the substrate and the strengthening layer is improved. Meanwhile, the size of the crystal grain of the strengthening layer is gradually reduced in the direction far away from the substrate to form a gradient structure, so that the stress difference between the surface layer and the region close to the transition layer in the tensile deformation process is ensured, the deformation of the strengthening layer close to the transition layer is easier, the stress is smaller, the mismatch cracking of the strengthening layer and the transition layer is reduced, and the failure of the strengthening layer is avoided; and the crystal grain size of the side far away from the matrix is small, so that enough strength can be ensured, and the mechanical property of the magnesium-lithium alloy part is further effectively enhanced. The strength of the magnesium-lithium alloy part can be effectively improved only by a plating mode, a special formula or complex deformation treatment is not needed, and the cost is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross-sectional view of one embodiment of a magnesium-lithium alloy article of the present invention;
FIG. 2 is a schematic view of the microstructure of an enhanced layer in the magnesium-lithium alloy shown in FIG. 1;
FIG. 3 is a graph showing the mechanical properties of a conventional uncoated magnesium-lithium alloy part;
FIG. 4 is a graph showing mechanical properties of an embodiment of a magnesium-lithium alloy part according to the present invention;
FIG. 5 is a flowchart illustrating steps of one embodiment of a method for manufacturing a magnesium-lithium alloy part according to the present invention;
FIG. 6 is a flow chart showing steps of another embodiment of a method for manufacturing a magnesium-lithium alloy part according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | Magnesium- |
15 | Reinforced |
| 11 | Magnesium-lithium alloy matrix | 151 | Die |
| 13 | Transition layer |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a magnesium-lithium alloy part, which can be applied to a shell in a head-mounted device, so that a magnesium-lithium alloy shell structure which is light in weight and enhanced in strength can be obtained.
Referring to fig. 1 and fig. 2, in an alternative embodiment of the present invention, a magnesium-lithium alloy part 1 includes a magnesium-lithium alloy substrate 11, a transition layer 13 and a strengthening layer 15, where the transition layer 13 is disposed on a surface of the magnesium-lithium alloy substrate 11;
the strengthening layer 15 is arranged on the surface of the transition layer 13, which is far away from the magnesium-lithium alloy substrate 11;
the transition layer 13 and the strengthening layer 15 are both made of metal materials, the material strength of the transition layer 13 is smaller than that of the strengthening layer 15, and the size of the crystal grains 151 of the strengthening layer 15 decreases in the direction from the magnesium-lithium alloy substrate 11 to the transition layer 13.
In this embodiment, the magnesium-lithium alloy substrate 11 may be a plate, a strip, or a block, and is used as a raw material of a housing of a processing device. When the magnesium-lithium alloy substrate 11 is a plate, it may be a flat plate, an arc plate, or a plate with some openings or connecting structures, and is not limited herein. The specific material ratio in the magnesium-lithium alloy matrix 11 is not improved here, so that it is not described too much, and it is only an alloy composed of magnesium and lithium elements. Illustratively, a transition layer 13 is provided on one surface of the magnesium-lithium alloy substrate 11, and a strengthening layer 15 is provided on the transition layer 13. The transition layer 13 and the strengthening layer 15 are made of metal, and the metal material type of the transition layer 13 needs to have a strength smaller than that of the metal material of the strengthening layer 15 to serve as a structure for intermediate bonding force. For example, the material of the transition layer 13 may be a material with low strength, such as one of copper, aluminum, or zinc, so as to have a certain deformation capability and play a certain buffering role when being subjected to an external force. The strengthening layer 15 is made of a material with relatively high strength, such as nickel, nickel-tungsten alloy, or one of nickel-phosphorus alloy and nickel-molybdenum alloy, so that the strengthening layer has a good corrosion resistance on the basis of a certain strength.
Of course, in other embodiments, the transition layer 13 and the strengthening layer 15 may be plated on both surfaces of the magnesium-lithium alloy substrate 11.
The size of the crystal grains 151 of the strengthening layer 15 is the volume size of the crystal grains 151, and here, the size of the crystal grains 151 tends to decrease in a direction away from the magnesium-lithium alloy substrate 11, and may gradually decrease or may decrease stepwise. It is understood that, if the strengthening layer 15 includes a plurality of micro-layers, the decrease in the size of the grains 151 herein refers to the average size of the grains 151 of each micro-layer in the direction away from the magnesium-lithium alloy substrate 11, and is not limited to one of the grains 151 of a micro-layer necessarily having a size larger than the size of the adjacent grains 151 near the magnesium-lithium alloy substrate 11.
In the technical scheme of the invention, the laminated transition layer 13 and the reinforced layer 15 are arranged on the magnesium-lithium alloy substrate 11, the transition layer 13 and the reinforced layer 15 are made of metal materials, the strength of the transition layer 13 is higher than that of the reinforced layer 15, and the strength of the transition layer 13 is lower than that of the reinforced layer 15, so that the transition layer can be used as an intermediate layer to play a good role in combination, and the strain coordination capability between the substrate and the reinforced layer 15 is improved. Meanwhile, the size of the strengthening layer 15 is gradually reduced in the direction far away from the substrate through the crystal grains 151 to form a gradient structure, so that the stress difference between the surface layer and the region close to the transition layer 13 in the tensile deformation process is ensured, the deformation of the strengthening layer 15 close to the transition layer 13 is easier, the stress is smaller, the mismatch cracking of the strengthening layer 15 and the transition layer 13 is reduced, and the failure of the strengthening layer 15 is avoided; and the crystal grain 151 on the side far away from the matrix has small size, so that enough strength can be ensured, and the mechanical property of the magnesium-lithium alloy part 1 can be effectively enhanced. And the strength of the magnesium-lithium alloy part 1 can be effectively improved only by a plating mode, a special formula or complex deformation treatment is not needed, and the cost is effectively reduced.
Referring to fig. 2, in an alternative embodiment, the grain 151 of the strengthening layer 15 near the transition layer 13 has the same size as the grain 151 of the transition layer 13.
In this embodiment, in order to make the bonding force between the strengthening layer 15 and the transition layer 13 higher, the size of the crystal grains 151 of the strengthening layer 15 close to the transition layer 13 is the same as the size of the crystal grains 151 of the transition layer 13, and the same is not limited to be exactly the same here, and there may be an error in a certain precision range. The plurality of crystal grains 151 in the transition layer 13 are not limited to be all the same in size and may fluctuate within a certain size range. In this way, the reinforcing layer 15 of this structure is equivalent to the transition layer 13 in stress at a portion close to the transition layer 13, so that mismatch cracking between the two can be further reduced, and the bonding strength can be improved.
In alternative embodiments, the thickness of the strengthening layer 15 ranges from 14 μm to 16 μm;
and/or the thickness of the transition layer 13 is in the range of 4-6 μm.
In this embodiment, the strengthening layer 15 is mainly used to strengthen the magnesium-lithium alloy substrate 11, so the thickness should not be too small, and certainly the thickness should not be too large, otherwise the bonding force between the layer and the transition layer 13, or even the magnesium-lithium alloy substrate 11, is affected. Therefore, the thickness of the reinforcing layer 15 is set to be in the range of 14 μm to 16 μm, for example, 14.5 μm, 15 μm, or 15.5 μm, so as to ensure good reinforcing strength and improve the stability of the entire structure.
Similarly, the transition layer 13 has a main function of bonding and bonding, so the thickness range is smaller than the thickness of the strengthening layer 15, and should not be too large, so the thickness range of the transition layer 13 is set to be 4 μm to 6 μm, for example, 4.5 μm, 5 μm or 5.5 μm, to improve the connection stability between the magnesium-lithium alloy substrate 11 and the strengthening layer 15.
Referring to fig. 1 and fig. 5, the present invention further provides a method for manufacturing a magnesium-lithium alloy part 1, including:
step S1: providing a magnesium-lithium alloy matrix 11, and pretreating the magnesium-lithium alloy matrix;
step S2: depositing a transition layer 13 on one surface of the magnesium-lithium alloy substrate 11, wherein the transition layer 13 is made of a metal material;
and step S3: carrying out first heat treatment;
and step S4: depositing a strengthening layer 15 on the surface of the transition layer 13, and gradually reducing the size of crystal grains 151 of the deposited strengthening layer 15 in the direction from the magnesium-lithium alloy substrate 11 to the transition layer 13, wherein the strengthening layer 15 is made of a metal material, and the material strength of the strengthening layer 15 is greater than that of the transition layer 13;
step S5: and carrying out secondary heat treatment.
It can be understood that since the head-mounted device is worn on the head and the head-mounted device shell needs to be light to improve comfort, the thickness of the magnesium-lithium alloy substrate 11 selected in step S1 is not necessarily large to reduce weight, and for example, a thin substrate is selected, and the specific dimensions can be selected according to actual conditions. Meanwhile, for convenience of manufacture, the surface of the magnesium-lithium alloy substrate 11 is pretreated so as to make the surface meet the plating conditions and states. Specifically, the pretreatment may be cleaning or surface texture resetting to improve the bonding force with the transition layer 13, which is not limited herein. Of course, the surface treatment may be preceded by a treatment of the size and shape of the metal substrate, for example cutting or bending, to achieve the desired size and shape of the product.
In step S2, a transition layer 13 is deposited on the surface of the magnesium-lithium alloy substrate 11, where the deposition method may be electroplating, magnetron sputtering, or other coating processes, which is not limited herein. The plating process is a common plating process, and the specific plating process is not described herein in any greater detail. The thickness of the deposited transition layer 13 can be set according to the requirement, for example, 4 μm to 6 μm, and the material can be one of copper, zinc or aluminum, the structural strength is relatively low, and the stress transmission and strain transition in the stretching process can be achieved.
In the step S3, after the transition layer 13 is plated, a first heat treatment is performed, in which the transition layer 13 and the magnesium-lithium alloy substrate 11 are heated, and mutual diffusion of metal pieces is utilized to improve the bonding force between the magnesium-lithium alloy substrate 11 and the transition layer 13, improve the structural stability, and simultaneously reduce the strength of the transition layer 13 and further eliminate the internal stress of the transition layer 13. Optionally, in the first heat treatment, the set heating temperature is 150 ℃ to 250 ℃, for example, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, or 240 ℃, and the like, and the heating time is 0.5h to 2h, for example, 1h, 1.5h, and the like, so that the bonding strength and the internal stress can be ensured to be eliminated according to different materials and thicknesses of the transition layer 13.
After the plating of the transition layer 13 is completed, the strengthening layer 15 is plated in step S4. The plating process can also be electroplating or magnetron sputtering or other conventional plating processes, and the processing cost is low. For example, electroplating may be selected to ensure that the size of the grains 151 gradually decreases during each micro-layer plating process by controlling the deposition parameters, wherein the grains 151 associated with the transition layer 13 have a coarse size consistent with the size of the grains 151 of the transition layer 13, and the grains 151 have a fine size on the surface of the strengthening layer 15 away from the magnesium-lithium alloy substrate 11, so as to ensure sufficient strength to achieve strength enhancement of the magnesium-lithium alloy substrate 11. Optionally, the material of the strengthening layer 15 is one of pure nickel, nickel-phosphorus alloy, nickel-molybdenum alloy or nickel-tungsten alloy, which can be selected as required, so that the strengthening layer has better strength and better plasticity to ensure the binding force. Optionally, the thickness of the strengthening layer 15 is in the range of 14 μm to 16 μm, so as to ensure the strengthening effect.
In step S5, after the strengthening layer 15 is plated, a second heat treatment is performed, where the strengthening layer 15, the transition layer 13, and the magnesium-lithium alloy substrate 11 are heated by the heat treatment, and mutual diffusion of metal pieces is used to improve the bonding force between the transition layer 13 and the strengthening layer 15, further improve the bonding force between the magnesium-lithium alloy substrate 11 and the transition layer 13, and improve the structural stability; and simultaneously, the internal stress of the strengthening layer 15 can be reduced. Optionally, the heating temperature in the second heat treatment is 150 ℃ to 250 ℃, for example, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, or 240 ℃, and the heating time is 0.5h to 2h, for example, 1h, 1.5h, and the like, so that the bonding strength and the internal stress can be ensured to be eliminated according to different materials and thicknesses of the transition layer 13.
The strengthening method has simple process, does not need special alloy formula or complex deformation treatment, and improves the strain coordination capacity between the magnesium-lithium alloy matrix 11 and the strengthening layer 15 by utilizing the transition layer 13 while ensuring good binding force. Meanwhile, the design of the reinforcing layer 15 with a unique gradient structure can ensure that the surface layer of the reinforcing layer 15 has different stress from the region close to the transition layer 13 in the stretching deformation process, so that the reinforcing layer 15 does not crack in advance and fail in the stretching process, and the mechanical property of the magnesium-lithium alloy is effectively enhanced.
The magnesium-lithium alloy reinforcing method has simple process, can adopt simple raw materials and devices, and effectively improves the mechanical property of the magnesium-lithium alloy by utilizing the unique strain coordination capability of different coatings. The method is efficient, simple and easy to implement, and is easy to realize industrial application.
In an alternative embodiment, a magnesium-lithium alloy substrate 11 is provided, and the pretreatment step thereof specifically includes:
step S11: carrying out oil removal treatment on the surface of the magnesium-lithium alloy matrix 11;
step S12: performing activation treatment on the surface of the magnesium-lithium alloy matrix 11;
step S13: and cleaning the surface of the magnesium-lithium alloy substrate 11 again.
It is understood that some oil stains or oil stains are usually left on the surface of the magnesium-lithium alloy substrate 11 when it is formed by die casting or other processes, so in this embodiment, step S11 performs an oil removing treatment, for example, cleaning it with clean water or an alkaline substance, to remove oil stains and impurities on the surface. In order to further improve the surface activity of the magnesium-lithium alloy substrate 11, an activation treatment is performed in step S12. The activation treatment can be carried out by selecting dilute sulfuric acid or active substances for cleaning, the concentration range of the dilute sulfuric acid is 1-3 mol/L, the activation time is about 30s, the fresh surface of the magnesium-lithium alloy matrix 11 can be obtained, and the structural influence on the matrix is prevented. Of course, the activation treatment may be performed by electrolytic activation, and is not limited herein. After the activation treatment, step S13 is performed to clean the surface of the magnesium-lithium alloy substrate 11 again, where clean water or deionized water may be selected for thorough cleaning to remove the residual reagent for activation, so as to further improve the surface bonding capability.
Of course, in other embodiments, only one of the degreasing treatment, the activation treatment and the re-cleaning may be selected.
In an alternative embodiment, the pre-treatment operation comprises mechanical treatment and/or chemical treatment, wherein the mechanical treatment comprises polishing or wiping, and the chemical treatment comprises chemical degreasing or chemical alkaline cleaning.
In this embodiment, the pretreatment is to obtain a better bonding surface, and includes a mechanical method, i.e., a physical method and a chemical method, for treating the magnesium-lithium alloy substrate 11. Optionally, the treatment is performed by a chemical method and then by a physical method. Of course, mechanical means such as sanding or wiping or the like may be used alone, or at least one of chemical means, i.e. chemical degreasing or chemical alkaline cleaning or the like may be used alone.
Referring to fig. 6, in an alternative embodiment, after the step of performing the first heat treatment and before the step of depositing the strengthening layer 15 on the surface of the transition layer 13, the method further includes the steps of:
step S35: and performing oxide removal treatment on the surface of the transition layer 13.
In this embodiment, after the first heat treatment, the surface of the transition layer 13 is oxidized at a high temperature, and in order to further improve the bonding force of the surface of the transition layer 13, the surface is subjected to an oxide removing treatment by an acid cleaning method, such as dilute sulfuric acid or acetic acid, or by an oxide removing agent, or by a wiping or polishing method, but not limited thereto, to provide a cleaner surface of the transition layer 13.
In addition, after the magnesium-lithium alloy part 1 is subjected to the second heat treatment, the temperature can be reduced at room temperature, or the temperature can be reduced through a cooling part. Of course, when other properties are required, subsequent treatments such as corrosion resistance and the like may also be performed.
With reference to fig. 1 and fig. 2, the present invention further provides a composite reinforced coating, where the composite reinforced coating includes a transition layer 13 and a reinforcing layer 15 that are stacked, the transition layer 13 and the reinforcing layer 15 are both made of metal materials, the strength of the material of the transition layer 13 is smaller than that of the material of the reinforcing layer 15, and the size of the grains 151 in the reinforcing layer 15 gradually decreases from a position close to the transition layer 13 to a position far away from the transition layer 13.
In this embodiment, the transition layer 13 and the strengthening layer 15 of the composite reinforced coating can refer to the structural arrangement of the transition layer 13 and the strengthening layer 15 in the magnesium-lithium alloy part 1, and therefore, further description of both is not given here. Optionally, the metal matrix of the composite reinforced coating can be selected from other magnesium alloys, such as magnesium-aluminum alloy or magnesium-rare earth alloy, the composite reinforced coating has more application scenes and higher structural strength, and the material is also a light material, so that the weight of the head-mounted equipment can be reduced, and the experience feeling can be improved. Here, the metal substrate may be a plate or a profile, and the surface thereof may be a plane or a curved surface, which is not limited herein. Certainly, the metal matrix can also be made of aluminum alloy and the like, the density is lower, the strength is moderate, the price is low, and the manufactured head-mounted equipment shell has the advantages of good structural stability, light weight, low cost and wide application.
The composite reinforced coating with the structure can ensure that the part close to the transition layer 13 is easier to deform and has smaller stress due to different stresses at different positions of the reinforcing layer 15 in the stretching process, thereby reducing the mismatch cracking caused by different stresses between the composite reinforced coating and the transition layer 13; the fine grain 151 on the surface layer can ensure enough strength to realize the enhancement effect of the mechanical property of the metal matrix.
The invention also provides a head-mounted device which comprises a shell, wherein the shell is made of the magnesium-lithium alloy part 1. Since the headset housing adopts all technical solutions of all the foregoing embodiments, at least the beneficial effects brought by the technical solutions of the foregoing embodiments are achieved, and no further description is given here.
The head-mounted equipment can be VR head-mounted equipment such as VR glasses and VR helmets, and can also be AR head-mounted equipment such as AR glasses. After the second heat treatment, the shell of the head-mounted device is usually subjected to a series of post-treatments to obtain the shell of the head-mounted device required by the user, and the shell of the head-mounted device is qualified after the verification.
The mechanical properties of the magnesium-lithium alloy part 1 according to the invention are explained in detail below with reference to specific examples.
The mechanical property of the magnesium-lithium alloy without the coating is tested, and the mechanical property graph is shown in fig. 3, and it can be seen that the engineering tensile strength of the magnesium-lithium alloy is lower than 150MPa. The mechanical property of the magnesium-lithium alloy part 1 according to an embodiment of the present invention is tested, and the mechanical property diagram is shown in fig. 4, which shows that the engineering tensile strength of the magnesium-lithium alloy part 1 is greater than 240MPa, and the strength is significantly improved. Therefore, the structure and the preparation method of the reinforced magnesium-lithium alloy part 1 can obtain better structural strength, the reinforcing process is simple, and the cost is effectively reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A magnesium lithium alloy article, comprising:
a magnesium lithium alloy matrix;
the transition layer is arranged on one surface of the magnesium-lithium alloy matrix; and
the strengthening layer is arranged on the surface of the transition layer, which is deviated from the magnesium-lithium alloy matrix;
the transition layer and the strengthening layer are both made of metal materials, the material strength of the transition layer is smaller than that of the strengthening layer, and the grain size of the strengthening layer is reduced in the direction from the magnesium-lithium alloy substrate to the transition layer.
2. The magnesium-lithium alloy part of claim 1, wherein the grain size of the strengthening layer on the side adjacent to the transition layer is the same as the grain size of the transition layer.
3. The magnesium-lithium alloy article of claim 1, wherein the strengthening layer has a thickness in the range of 14 μm to 16 μm;
and/or the thickness range of the transition layer is 4-6 μm.
4. The magnesium-lithium alloy part of claim 1, wherein the material of the transition layer is one of copper, aluminum or zinc;
and/or the material of the strengthening layer is one of nickel, nickel-phosphorus alloy, nickel-molybdenum alloy and nickel-tungsten alloy.
5. A preparation method of a magnesium-lithium alloy part is characterized by comprising the following steps:
providing a magnesium-lithium alloy matrix, and pretreating the magnesium-lithium alloy matrix;
depositing a transition layer on one surface of the magnesium-lithium alloy matrix, wherein the transition layer is made of a metal material;
carrying out first heat treatment;
depositing a strengthening layer on the surface of the transition layer, and gradually reducing the grain size of the deposited strengthening layer in the direction from the magnesium-lithium alloy substrate to the transition layer, wherein the strengthening layer is made of a metal material, and the material strength of the strengthening layer is greater than that of the transition layer;
and carrying out secondary heat treatment.
6. The method for preparing the magnesium-lithium alloy part according to claim 5, wherein the step of providing a magnesium-lithium alloy matrix and the step of pretreating the magnesium-lithium alloy matrix specifically comprise the following steps:
carrying out oil removal treatment on the surface of the magnesium-lithium alloy matrix;
carrying out activation treatment on the surface of the magnesium-lithium alloy matrix;
and cleaning the surface of the magnesium-lithium alloy matrix again.
7. The method for preparing the magnesium-lithium alloy part according to claim 5, wherein the pretreatment operation comprises mechanical treatment and/or chemical treatment, wherein the mechanical treatment comprises grinding or wiping, and the chemical treatment comprises chemical degreasing or chemical alkali washing.
8. The method for preparing the magnesium-lithium alloy part according to claim 5, wherein the deposition mode in the deposition of the transition layer on one surface of the magnesium-lithium alloy substrate is electroplating or magnetron sputtering;
and/or the deposition mode of depositing the strengthening layer on the surface of the transition layer is electroplating or magnetron sputtering.
9. The method for preparing a magnesium-lithium alloy part according to any one of claims 5 to 8, wherein after the step of performing the first heat treatment and before the step of depositing the strengthening layer on the surface of the transition layer, the method further comprises the steps of:
and carrying out oxide removal treatment on the surface of the transition layer.
10. The method of manufacturing a magnesium-lithium alloy member according to any one of claims 5 to 8, wherein the heating temperature in each of the first heat treatment and the second heat treatment is 150 ℃ to 250 ℃ ， The heating time is 0.5 h-2 h.
11. The composite reinforced coating is characterized by comprising a transition layer and a strengthening layer which are arranged in a stacking mode, wherein the transition layer and the strengthening layer are both made of metal materials, the material strength of the transition layer is smaller than that of the strengthening layer, and the grain size in the strengthening layer is gradually reduced from the position close to the transition layer to the position far away from the transition layer.
12. A head-mounted device, characterized in that the head-mounted device comprises a shell, and the shell is made of the magnesium-lithium alloy part according to any one of claims 1 to 4.
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