High performance low alloyed zinc alloy sheet and foil, method of production and use

Abstract

The application belongs to the technical field of zinc alloy preparation, and particularly relates to a high-performance low-alloyed zinc alloy plate and foil, a preparation method and application, which comprises the following weight percentage components: Cu 0.4-0.8%, Mg 0.01-0.05%, and the balance being Zn; the preparation method of the high-performance low-alloyed zinc alloy plate and foil comprises the following steps: sequentially performing homogenization treatment, forging and rolling on a zinc alloy ingot to obtain the high-performance low-alloyed zinc alloy plate and foil; the rolling is performed in multiple times, and annealing treatment is arranged between each rolling; the rolling temperature is 150-200 DEG C, the single-pass rolling reduction is not greater than 0.5 mm, and the annealing time is not greater than 30 min; the application has higher elongation on the basis of maintaining good strength.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of zinc alloy preparation, and particularly relates to a high-performance low-alloyed zinc alloy plate / foil material, a preparation method and application. BACKGROUND

[0002] Degradable metal materials have significant advantages in the fields of orthopedics, cardiovascular and the like due to no need for secondary surgery for removal. Zinc alloy is considered as the third generation of degradable metal after magnesium and iron due to excellent biocompatibility and controllable degradation rate.

[0003] At present, the mechanical properties of zinc alloy are mainly improved through alloying and subsequent plastic deformation. The developed zinc alloy mainly includes Zn-Mg system, Zn-Li system, Zn-Mn system and Zn-Cu system, and various ternary and multi-element alloy systems formed on the basis of these alloys. Considering the unique aging phenomenon of zinc alloy, the elements with high solid solubility should be preferred in alloying design, which can also play a solid solution strengthening effect. Since the maximum solid solubility of Cu element in zinc is about 2.75%, the Cu element with excellent antibacterial property is preferred as the first alloying element.

[0004] The existing zinc alloy material still has deficiencies in performance and preparation: on the one hand, in order to improve the mechanical properties, some zinc alloys adopt high alloying design, which increases the material cost, and too many alloying elements may have adverse effects on biocompatibility; on the other hand, in the preparation process of plate / foil material, the traditional process is difficult to balance the high strength, high plasticity and processing formability of the material, especially for the foil with a thickness of less than 0.2 mm, the preparation often faces problems such as large processing difficulty, unstable mechanical properties and the like, which is difficult to meet the strict requirements of high-end medical devices such as bone plates and oral repair membranes. Zinc belongs to hexagonal close-packed (HCP) crystal structure, and the number of slip systems is small. As a traditional plate / foil forming process, rolling usually adopts a large reduction and a low rolling temperature, and the traditional preparation method will continuously accumulate the basal plane oriented grains, and finally form a strong basal plane texture. Although this texture feature can improve the strength of the material in a certain direction, it will also cause the zinc alloy plate to have obvious anisotropy, which is not conducive to the subsequent processing and forming and the improvement of comprehensive mechanical properties.

[0005] Patent application AU2020102744A4 discloses a high-performance biodegradable Zn-Cu-Li-X alloy and its preparation method and application method, the chemical composition of the alloy is as follows: Cu is 0.1-2.75wt%, Li is 0.1-1.5wt%, X is at least one of Mg, Ca, Sr, Mn, Fe, Ag, Co, Cr, Ti, Sn, Si, Se, Ge, Mg is 0.01-9.9wt%, Ca is 0.01-5.8wt%, Sr is 0.01-9.5wt%, Mn is 0.01-8.5wt%, Fe is 0.01-6.1wt%, Ag is 0.01-10.5wt%, Co is 0.01-6.4wt%, Cr is 0.01-4.4wt%, Ti is 0.01-4.8wt%, Sn is 0.01-5wt%, Si is 0.01-5wt%, Se is 0.01-5wt%, Ge is 0.01-5wt%, and the balance is Zn. However, its elongation is generally. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a high-performance low-alloyed zinc alloy plate and foil material, a preparation method and application, which has high elongation on the basis of maintaining good strength.

[0007] The embodiment of the present application provides a high-performance low-alloyed zinc alloy plate and foil material, which comprises the following weight percentage components: Cu 0.4-0.8%, Mg 0.01-0.05%, and the balance is Zn.

[0008] The preparation method of the high-performance low-alloyed zinc alloy plate and foil material comprises the following steps: sequentially performing homogenization treatment, forging and rolling on a zinc alloy ingot to obtain the high-performance low-alloyed zinc alloy plate and foil material.

[0009] The rolling is performed in multiple times, and annealing treatment is arranged between each rolling, the temperature of the rolling is 150-200 DEG C, the single-pass rolling reduction is not greater than 0.5mm, and the annealing time is not greater than 30min.

[0010] The zinc alloy plate and foil material provided by the present application comprises a plate and a foil, the thickness of the plate is generally less than 1mm, and the thickness of the foil is generally less than 0.2mm.

[0011] Preferably, Ca and / or Sr are further included, and the weight percentage of Ca and / or Sr is 0.08-0.15%.

[0012] Preferably, the weight percentage of Ca and / or Sr is 0.1-0.15%.

[0013] Preferably, the weight percentage components include Cu 0.5-0.7%, Mg 0.02-0.03%, Ca 0.05-0.1%, Sr 0.05-0.1%, and the rest is Zn.

[0014] Preferably, the weight ratio of Ca and Sr is 1:1-2.

[0015] The embodiment of the present application provides a preparation method of the high-performance low-alloyed zinc alloy plate and foil.

[0016] The rolling is performed in multiple times, and annealing treatment is arranged between each rolling, the rolling temperature is 180-220 DEG C, the single-pass rolling reduction is not greater than 0.5 mm, and the annealing time is not greater than 30 min.

[0017] Preferably, the homogenization treatment temperature is 280-300 DEG C, and the holding time is 6-12 h.

[0018] Preferably, the rolling temperature is 180-200 DEG C, the rolling is performed in multiple times, each rolling includes multiple single-pass rollings, and the directions of adjacent rollings are different.

[0019] Preferably, the preparation method of the zinc alloy ingot comprises the following steps: melting each component, heating to 520-550 DEG C under inert gas protection, holding for 3-5 min, then cooling to 480-500 DEG C, then heating to 550-570 DEG C again, and then casting.

[0020] The forging of the present application can forge the zinc alloy ingot into a pre-rolling plate with a predetermined thickness and width.

[0021] The embodiment of the present application provides an application of the high-performance low-alloyed zinc alloy plate and foil.

[0022] The zinc alloy plate of the present application has a bimodal heterogeneous structure of grain orientation and grain size, and the bimodal heterogeneous structure is formed by the bimodal orientation heterogeneous structure, the fine grain zone formed by dynamic recrystallization and the residual deformation coarse grain zone arranged alternately.

[0023] The zinc alloy plate foil material has excellent antibacterial performance, degradation performance and bone formation ability, and the mechanical property change is less than or equal to 5% within half a year of room temperature storage, wherein the plate material can be applied to an internal fixation system bone plate, and the foil material can be applied to an oral cavity repair film and the like, and has a wide market prospect and good medical value.

[0024] The high-density twin crystal is introduced at the initial forging stage, and with the increase of the interaction between the twin crystal dislocations, the non-basal slip in the twin crystal is activated. Further, through the different direction rolling, the bimodal orientation texture and the two-stage heterogeneous structure with heterogeneous grain size are successfully prepared, the coordination of the alloy strength and toughness is realized, and the alloy has more sustained strain hardening capacity at large strain. Meanwhile, by adding the alkaline earth metal third component (magnesium (Mg), calcium (Ca) and strontium (Sr)) in the Zn-Cu alloy, the superplastic zinc alloy is successfully prepared through forging and rolling.

[0025] In the zinc alloy, the area fraction of CuZn4 phase is not more than 5%; and the trace magnesium element exists in the form of solute atoms. Within the component range defined in the application, the Zn-Cu-(Mg / Ca / Sr) alloy structure contains at least one of Mg2Zn 11 phase, CaZn 13 phase and SrZn 13 phase in addition to the η-Zn matrix and blocky ε-CuZn4 phase. During the forging and rolling process of the application, the microstructure of the zinc alloy mainly changes as follows:

[0026] 1) At the initial forging stage, the Zn-Cu-(Mg / Ca / Sr) alloy with excellent thermal stability forms high-density twin crystals to adapt to deformation and achieve the effect of dividing the original parent crystal and refining the grain.

[0027] 2) With the increase of the forging deformation, the interaction between the twin crystal and the dislocation is intensified, which is beneficial to the generation of non-basal slip. Due to the twin crystal induced dynamic recrystallization and its promotion effect on continuous induced dynamic recrystallization, the dislocation array in the twin crystal and the deformation band can form subgrains. At the same time, subgrains can also be formed at the intersection of twin crystals, including the small-angle grain boundaries of twin boundaries.

[0028] 3) During the rolling process, the bimodal orientation texture and the two-stage heterogeneous structure with heterogeneous grain size are successfully prepared through different direction rolling, the coordination of the alloy strength and toughness is realized, and the alloy has more sustained strain hardening capacity at large strain. Meanwhile, by adding the alkaline earth metal third component in the Zn-Cu alloy, the superplastic Zn alloy is successfully prepared through forging and rolling.

[0029] In the present application, the grain size heterostructure is synergistically regulated by introducing high-density twins and by twin-induced dynamic recrystallization / continuous induced dynamic recrystallization. At the same time, a bimodal texture is successfully prepared by cross-rolling, overcoming the adverse effects of strong basal texture in the traditional rolling process, especially by activating the non-basal slip to make the deformation process more uniform and coordinate the strain of the grains along the c-axis direction, which is beneficial to reduce anisotropy. Thus, the work hardening behavior is regulated by double hetero-induced strengthening, and the work hardening capacity is more sustainable in a large strain range.

[0030] The total content of alloying elements in the zinc alloy is not more than 0.8%. The Cu element with excellent antibacterial property is beneficial to improve the mechanical properties and regulate the degradation rate. Further micro-alloying by including the third component of alkaline earth metal (Mg, Ca, Sr) improves the mechanical properties, and promotes the repair and regeneration of bone tissue, especially particularly suitable for efficient preparation of high-strength degradable bone plates, high-plasticity bone guided regeneration membranes and other bone implant materials. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The SEM structure of the Zn-0.6Cu-0.025Mg alloy in Example 1 of the present application is shown in Figure 1. The average grain size of the zinc matrix is about 1.9 μm, and a bimodal texture is presented with a maximum texture intensity of 13.9. In Figure 1, Figure 1 (a) is the SEM structure, Figure 1 (b) is the pole figure and the inverse pole figure.

[0032] Figure 2 The SEM structure of the Zn-0.6Cu-0.025Mg alloy in Comparative Example 2 is shown in Figure 2. The average grain size of the zinc matrix is about 36.3 μm, and a high-density twin exists, and a bimodal texture is presented with a maximum texture intensity of 6.0. In Figure 2, Figure 2 (a) is the SEM structure, Figure 2 (b) is the pole figure and the inverse pole figure.

[0033] Figure 3 The SEM structure of pure Zn in Comparative Example 5 is shown in Figure 5. The average grain size of the zinc matrix is about 67.2 μm, and a small amount of twins exist, and the maximum texture intensity is 6.7. In Figure 5, Figure 3 (a) is the SEM structure, Figure 3 (b) is the pole figure and the inverse pole figure. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be described in detail below with reference to some specific examples. The specific examples described herein are only used to explain the present application and not to limit the present application.

[0035] Example 1

[0036] A medical degradable Zn-Cu-Mg alloy, with the element mass fraction of Cu: 0.6%, Mg: 0.025%, and the balance being Zn.

[0037] The preparation method is as follows:

[0038] (1) batching: according to the alloy component design, each raw material is prepared, and the raw materials include pure zinc ingot, zinc-copper intermediate alloy, zinc-magnesium intermediate alloy, zinc-calcium intermediate alloy and zinc-strontium intermediate alloy.

[0039] (2) smelting: the pure zinc ingot, zinc-copper intermediate alloy and zinc-magnesium intermediate alloy are smelted under the protection of inert atmosphere to obtain a zinc alloy ingot.

[0040] Specifically, a graphite crucible with a melting point higher than 3000 ℃ is used, the vacuum degree of smelting is ≤1×10 -3 Pa; smelting is carried out in two steps, first, the temperature is raised to 530 ℃, and then the temperature is kept for 4 min, then the temperature is lowered to 500 ℃, then the temperature is raised to 550 ℃ again, and electromagnetic stirring is carried out at the same time, the frequency of electromagnetic stirring is 1000 Hz, and the molten metal is quickly poured into a graphite mold after the temperature of the molten metal reaches 550 ℃; the mold temperature is controlled at 220 ℃.

[0041] (3) homogenization treatment: the above-mentioned zinc alloy ingot is subjected to homogenization treatment, and the homogenization temperature is 300 ℃, and the holding time is 12 h.

[0042] (4) forging: a rod with a diameter of 50 mm is turned from the above-mentioned homogenized zinc alloy ingot, and then the zinc alloy rod is forged, and repeatedly forged to a thickness of 9.5 mm, and each side is milled to a skin layer of 0.5 mm, to obtain a pre-rolled plate with a thickness of 8.5 mm and a width of 65 mm.

[0043] (5) rolling: the above-mentioned pre-rolled plate is heated to 180 ℃ in vacuum for 0.2 hours, and the width of the pre-rolled plate is widened to 110 mm and the thickness is thinned to 5.5 mm through multi-pass rolling, wherein the single-pass rolling reduction is ≤0.5 mm (the pass deformation is 5.88-9.1%). Then it is subjected to intermediate annealing at 180 ℃ for 0.2 hours. After annealing and cooling, the plate is subjected to reversing rolling, and the thickness is further thinned to 1.0 mm, wherein the single-pass rolling reduction is ≤0.3 mm (the pass deformation is 5.45-30%).

[0044] The zinc alloy plate has a bimodal heterogeneous structure of grain orientation and grain size, and the maximum texture strength is 13.9, and the average grain size is 1.9 μm.

[0045] Since the total content of alloying elements of the zinc alloy is within 0.8%, the solid solution strengthening effect of copper elements in the zinc matrix is fully played, and the addition of trace magnesium elements further significantly improves the mechanical properties. The improvement of uniform elongation is due to the deformation hardening caused by the mismatch of the deformation compatibility of coarse and fine grains in the heterogeneous structure, so as to have a more sustained strain hardening capacity during the tensile load process. Therefore, under the heterogeneous induced strengthening effect of the two-stage heterogeneous structure of the present application, the zinc alloy obtains the combination of high strength and toughness and high work hardening rate, and can effectively avoid the fracture phenomenon of the zinc alloy implant at local positions due to excessive deformation. In addition, since a certain amount of high-melting-point Cu elements and trace Mg elements are dissolved in the low-melting-point zinc as the matrix material, the thermal stability of the Zn matrix is greatly improved, thereby greatly improving the anti-aging performance of the Zn alloy.

[0046] Example 2

[0047] Compared with Example 1, the difference of Example 2 is that:

[0048] In step (5), the plate material thinned to 1.0 mm is subjected to intermediate annealing at 180℃, and the annealing time is 0.2 hours. After annealing and cooling, further thinning to 0.1 mm is performed by rolling.

[0049] The other steps are the same as those of Example 1.

[0050] The zinc alloy foil has a two-stage heterogeneous structure of grain orientation and grain size, the maximum texture strength is 12.4, and the average grain size is 1.6 μm.

[0051] Example 3

[0052] Compared with Example 1, the difference of Example 3 is that:

[0053] In step (5), the plate material thinned to 5.5 mm is subjected to intermediate annealing at 180℃, and the annealing time is 0.3 hours. After annealing and cooling, reversing rolling is performed, and further thinning to 1.0 mm is performed by rolling.

[0054] The other steps are the same as those of Example 1.

[0055] The zinc alloy plate has a two-stage heterogeneous structure of grain orientation and grain size, the maximum texture strength is 13.7, and the average grain size is 1.8 μm.

[0056] Example 4

[0057] Compared with Example 1, the difference of Example 4 is that the mass fraction of each element in the alloy is Cu: 0.6%, Mg 0.025%, Ca 0.1%, and the balance is Zn.

[0058] The other steps are the same as those of Example 1.

[0059] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 9.1, and the average grain size is 1.7 μm.

[0060] Example 5

[0061] Compared with Example 1, the difference of Example 5 lies in that the mass fraction of each element in the alloy is Cu: 0.6%, Mg 0.025%, Sr 0.1%, and the balance is Zn.

[0062] The other steps are the same as those in Example 1.

[0063] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 8.2, and the average grain size is 1.3 μm.

[0064] Example 6

[0065] Compared with Example 1, the difference of Example 6 lies in that the mass fraction of each element in the alloy is Cu: 0.6%, Mg 0.025%, Ca 0.05%, Sr 0.05%, and the balance is Zn.

[0066] The other steps are the same as those in Example 1.

[0067] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 6.9, and the average grain size is 1.1 μm.

[0068] Example 7

[0069] Compared with Example 1, the difference of Example 7 lies in that the mass fraction of each element in the alloy is Cu: 0.6%, Mg 0.025%, Ca 0.05%, Sr 0.1%, and the balance is Zn.

[0070] The other steps are the same as those in Example 1.

[0071] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 8.2, and the average grain size is 1.3 μm.

[0072] Comparative Example 1

[0073] Compared with Example 1, the difference of Comparative Example 1 lies in that, in the rolling process of step (5), the pre-rolled sheet in Comparative Example 1 does not need to be rolled in the opposite direction, that is, the pre-rolled sheet is directly rolled along the long side of the pre-rolled sheet, and the thickness of the pre-rolled sheet is reduced to 1.0 mm.

[0074] The other steps are the same as those in Example 1.

[0075] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 17.3, and the average grain size is 1.4 μm.

[0076] Comparative Example 2

[0077] Comparative Example 2 and Example 1 differ in that in step (5), the sheet material is thinned to 1.0 mm and then subjected to intermediate annealing at 180°C for 2 hours. After annealing and cooling, the sheet material is further thinned to 0.03 mm by rolling.

[0078] The other steps are the same as in Example 1.

[0079] The superplastic zinc alloy foil has a high density of twin crystals and a bimodal heterogeneous structure of orientation, the maximum texture intensity is 6.0, and the average grain size is 36.3 μm.

[0080] Comparative Example 3

[0081] Comparative Example 3 and Example 1 differ in that in the alloy, the mass fraction of each element is Ca: 0.15%, and the remainder is Zn.

[0082] The other steps are the same as in Example 1.

[0083] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 11.3, and the average grain size is 2.4 μm.

[0084] Comparative Example 4

[0085] Comparative Example 4 and Example 1 differ in that in the alloy, the mass fraction of each element is Sr: 0.6%, and the remainder is Zn.

[0086] The other steps are the same as in Example 1.

[0087] The superplastic zinc alloy sheet has a bimodal heterogeneous structure of grain orientation and grain size, the maximum texture intensity is 11.3, and the average grain size is 0.9 μm.

[0088] Comparative Example 5

[0089] Comparative Example 5 and Example 1 differ in that the comparative example is pure Zn, and no alloying elements are added.

[0090] The other steps are the same as in Example 1.

[0091] The pure Zn sheet material exhibits coarse equiaxed grains, the maximum texture intensity is 6.7, and the average grain size is 67.2 μm.

[0092] By adjusting the mass of each element in the Zn-Cu-Mg-Ca-Sr alloy, the comparative examples 6-10 were obtained, and the other conditions were the same as those in example 1. The properties of each example and comparative example were measured, and the mechanical property results of the zinc alloy were shown in Table 1.

[0093] Table 1 Comparison of mechanical properties of zinc alloy

[0094]

[0095] The unit of tensile strength (UTS) is MPa, and the unit of fracture elongation (TE) is %.

[0096] As can be seen from Table 1, the low-alloyed Zn0.6Cu0.025Mg alloy sheet and foil has an excellent combination of strength and toughness, which can be maintained at more than 370 MPa, and the fracture elongation is higher than 52%. On the basis of maintaining Cu 0.6 % / Mg 0.025 %, the trace Sr-Ca composite addition can make the zinc alloy achieve "medium-high strength (≈300 MPa) + ultra-high elongation (>50 %)", which is significantly better than the comparative groups without addition or excessive addition. The addition amount of Ca or / and Sr in the application is required, and the total content is required to be 0.1-0.5 %, and exceeding or being lower than that will cause the improvement amplitude of fracture elongation to decrease obviously. At the same time, short annealing time (annealing time <0.5h) is beneficial to improve the work hardening capacity, and the zinc alloy has higher strength and plasticity, while in the comparative example 2, due to the abnormal grain growth with the annealing time being greater than 1h, the plasticity is obviously reduced. Further, by means of the different direction rolling, the bimodal orientation texture and the grain size heterogeneous double-stage heterogeneous structure are successfully prepared, the efficient coordination of the alloy strength and toughness is realized, and the strain hardening capacity is more sustainable at large strain.

[0097] As can be seen from the comparative examples 6-10, when the Cu content is excessive (such as Cu≥2%), the tensile strength is significantly reduced, and copper is a heavy metal, which is not suitable to be too high in the medical device implanted in the body. On the basis of the low-alloyed Zn-Cu-Mg, when the total addition amount of the alkaline earth metal elements Ca and Sr is more than 0.15%, the strength is significantly reduced.

[0098] As shown in Figure 1 , the SEM structure of the Zn-0.6Cu-0.025Mg alloy in example 1 of the application is shown, the average grain size of the zinc matrix is about 1.9 μm, and a bimodal texture is presented, and the maximum texture intensity is 13.9.

[0099] As shown in Figure 2 , the SEM structure of the Zn-0.6Cu-0.025Mg alloy in comparative example 2 is shown, the average grain size of the zinc matrix is about 36.3 μm, there is a high density of twin crystals, and a bimodal texture is presented, and the maximum texture intensity is 6.0.

[0100] like Figure 3 As shown, the SEM structure of pure Zn in Comparative Example 5 is as follows: the average grain size of the zinc matrix is ​​about 67.2 μm, a small number of twins are present, and the maximum texture intensity is 6.7.

[0101] It can be seen that the addition of Cu, an element with high solid solubility, in this invention is beneficial to improving its mechanical properties. Further, microalloying with alkaline earth metals (Mg, Ca, Sr) as a tertiary element enhances mechanical properties while promoting bone tissue repair and regeneration, and exhibits good biocompatibility. The aforementioned low-alloyed zinc alloy plates and foils possess excellent antibacterial properties, degradation resistance, and osteogenic capacity, with mechanical property changes of ≤5% within six months of room temperature storage. The plates can be used in bone plates for internal fixation systems, while the foils can be applied to products such as dental repair membranes, demonstrating broad market prospects and significant medical value.

[0102] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0103] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A high-performance low-alloy zinc alloy sheet / foil, characterized in that, It includes the following components by weight percentage: Cu 0.4–0.8%, Mg 0.01–0.05%, with the balance being Zn; The preparation method of the high-performance low-alloy zinc alloy plate and foil is as follows: the zinc alloy ingot is subjected to homogenization treatment, forging and rolling in sequence to obtain the high-performance low-alloy zinc alloy plate and foil. The rolling process is performed in multiple passes, each pass consisting of multiple single-pass rolling passes with different directions for adjacent passes. An annealing treatment is performed between each pass. The rolling temperature is 150–200°C, the reduction per single pass is no more than 0.5 mm, and the annealing time is no more than 30 min.

2. The high-performance low-alloy zinc alloy sheet and foil as described in claim 1, characterized in that, It also includes Ca and / or Sr, with a weight percentage of Ca and / or Sr of 0.08 to 0.15%.

3. The high-performance low-alloy zinc alloy sheet and foil as described in claim 2, characterized in that, The weight percentage of Ca and / or Sr is 0.1% to 0.15%.

4. The high-performance low-alloy zinc alloy sheet and foil as described in claim 2, characterized in that, It includes the following components by weight percentage: Cu 0.5-0.7%, Mg 0.02-0.03%, Ca 0.05-0.1%, Sr 0.05-0.1%, with the balance being Zn.

5. The high-performance low-alloy zinc alloy sheet and foil as described in claim 2, characterized in that, The weight ratio of Ca to Sr is 1:1 to 2.

6. A method for preparing high-performance low-alloy zinc alloy sheet / foil as described in any one of claims 1-5, characterized in that, The zinc alloy ingots are sequentially homogenized, forged, and rolled to obtain high-performance low-alloy zinc alloy sheet and foil. The rolling process is performed in multiple passes, each pass consisting of multiple single-pass rolling passes with different directions for adjacent passes. An annealing treatment is performed between each pass. The rolling temperature is 180–220°C, the reduction per single pass is no more than 0.5 mm, and the annealing time is no more than 30 min.

7. The preparation method according to claim 6, characterized in that, The homogenization process is carried out at a temperature of 280–300°C for 6–12 hours.

8. The preparation method according to claim 6, characterized in that, The rolling temperature is 180–200°C.

9. The preparation method according to claim 6, characterized in that, The zinc alloy ingot is prepared by melting the components, heating it to 520-550 °C under inert gas protection, holding it at that temperature for 3-5 minutes, then cooling it to 480-500 °C, then heating it again to 550-570 °C, and then casting it.

10. An application of the high-performance low-alloy zinc alloy sheet / foil as described in any one of claims 1-5, characterized in that, The high-performance low-alloy zinc alloy sheet and foil are used to manufacture medical devices that can be implanted in the body.

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