Solid-solution-free fast-aging-response high-strength and high-plasticity magnesium alloy and laser fuse material adding method thereof

Abstract

The invention discloses a solid-solution-free fast-aging-response high-strength and high-plasticity magnesium alloy and a laser fuse additive method thereof, and belongs to the field of alloy forming and manufacturing. The method comprises the following steps: firstly, polishing and cleaning an Mg-Al / Mg-Zn series magnesium alloy substrate, carrying out heat preservation pretreatment, then carrying out annular / linear swing type laser scanning, carrying out multi-layer laser additive manufacturing on an Mg-Zn series wire with specific components, and carrying out low-temperature short-time aging at 150-190 DEG C for 1-5 hours to obtain the alloy. Through cooperative regulation and control of the process and parameters, low heat input and high cooling rate are achieved, grains are refined to be smaller than or equal to 10 microns, segregation and coarse phases are inhibited, high-temperature solution treatment is avoided, and aging response is fast. The prepared alloy is smooth in surface, the forming precision reaches the submillimeter level, mechanical property anisotropy is avoided, the yield strength is larger than or equal to 248 MPa, the tensile strength is larger than or equal to 340 MPa, the ductility is larger than or equal to 20%, the high strength and the high plasticity are achieved, the process is safe, energy consumption is low, the material utilization rate is high, and the method is suitable for preparing light-weight precision components in the high-end manufacturing field such as aerospace.

Description

Technical Field

[0001] This invention belongs to the field of alloy forming and manufacturing, specifically relating to a solution-free, fast-aging-response high-strength, high-plasticity magnesium alloy and its laser-fused-wire additive manufacturing method. Background Technology

[0002] With the increasing demand for large, integrated, and highly complex magnesium alloy components in fields such as transportation and aerospace, the related material preparation processes are facing urgent pressure for technological upgrades. Traditional processing methods such as casting, forging, and welding can only produce simple structural components or components of a single size. To further improve the strength and plasticity of the material, it is necessary to combine multi-stage homogenization treatment and multi-stage high-temperature long-term solution treatment. When dealing with irregularly shaped components, multiple sizes, and high-strength and plastic materials, it is often difficult to achieve synergistic optimization among processing efficiency, cost control, forming accuracy, and mechanical properties. The inherent limitations are becoming increasingly prominent. That is, the simultaneous improvement of component production cost, shape, size, and safety, as well as strength and plasticity, are the technical challenges that urgently need to be solved.

[0003] Compared to traditional manufacturing processes, powder additive manufacturing has attracted widespread attention due to its high degree of design freedom and forming flexibility. Although powder additive manufacturing can form components with complex structures, the surface of the formed parts is rough, and the generation of macrosegregation and coarse eutectic phases makes it difficult to simultaneously meet the relevant requirements for strong plasticity. Therefore, it is necessary to combine multi-stage homogenization treatment and multi-stage high-temperature long-term solid solution treatment to suppress macrosegregation and refine the eutectic phase, which leads to complex heat treatment processes and high energy consumption. In addition, due to the high activity and easy oxidation of magnesium powder during the powder additive manufacturing process, there are risks of combustion and explosion during preparation, storage and processing, which are difficult to manage and have low efficiency and low material utilization. Therefore, it seriously restricts the industrial application of alloy additive manufacturing.

[0004] Therefore, ensuring safe production, reducing component production costs, suppressing surface roughness of formed parts, improving dimensional accuracy, simplifying processes, reducing long-term high-temperature energy consumption, forming both simple and complex shapes, having adjustable and controllable dimensions, avoiding anisotropy, achieving uniform properties of components in all directions, simultaneously improving strength and plasticity, reducing production costs, and realizing industrialized production are the technical challenges that urgently need to be solved. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy, the preparation method of which includes the following steps: (1) After removing the oxide layer on the surface of the magnesium alloy substrate by mechanical grinding, the substrate is then ultrasonically cleaned with anhydrous ethanol to remove residual impurities, and then kept at 60-200 ℃ for 10-30 min to obtain the pretreated substrate. (2) Using a oscillating laser scanning method, magnesium alloy wire is subjected to ≥5 layers of laser additive manufacturing on the pretreated substrate obtained in step (1), followed by aging treatment to obtain a solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy. Each layer of laser additive manufacturing involves: laser travel in a circular or linear oscillating mode; laser center wavelength of 1000-1300 nm; laser travel speed of 0.3-1.2 m / min; laser oscillation range of 1.5-3 mm; oscillation frequency of 45-100 Hz; laser power of 400-1200 W; and laser frequency of 1200-3100 Hz. The angle between the laser and the pretreated substrate obtained in step (1) is 80-100°, and the distance between the laser and the pretreated substrate is 4-20 mm. The angle between the magnesium alloy wire and the pretreated substrate obtained in step (1) is 20-60°, and the distance is 5-16 mm. The wire feeding speed is 0.3-2... m / min; the thickness of each laser additive manufacturing layer is 0.3-0.8 mm; the aging treatment is carried out at 150-190 ℃ for 1-5 h; The aforementioned solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy features a smooth surface, high dimensional precision, and avoids macroscopic segregation, coarse grain boundaries, eutectic phases, and significant anisotropy. It boasts a uniform microstructure with equiaxed fine grains ≤10 μm in size, resulting in uniform anisotropic properties and simultaneous improvement in strength and ductility. It can accommodate both simple and complex structures and achieves sub-millimeter-level feature dimension forming accuracy (0.5-2 mm), achieving near-net-shape forming. Its yield strength is ≥248 MPa, tensile strength ≥340 MPa, and elongation ≥20%. Furthermore, its mechanical properties exhibit no anisotropic variation. Furthermore, the magnesium alloy described in step (1) is either a Mg-Al system or a Mg-Zn system; Furthermore, the magnesium alloy wire mentioned in step (2) is one of the Mg-Zn series and has a diameter of 0.8-2.0 mm; Furthermore, the Mg-Al system mentioned in step (1) is one of AZ31 and AZ91, and the Mg-Zn system is one of ZK60 and ZK90; Further, the Mg-Zn system described in step (2) consists of the following components by mass percentage: Zn: 5.0-8.0 wt. %, Zr: 0.3-0.7 wt. %, unavoidable impurities ≤0.05%, and the balance is Mg; Further, the Zn in step (2) is 5.5-6.3 wt.%; Furthermore, by using a swing-type laser scanning method, 10-120 layers of laser additive manufacturing are carried out on the pretreated substrate obtained in step (1), followed by aging treatment to obtain a high-strength, high-plasticity magnesium alloy with fast aging response and no solution treatment required. Furthermore, the aforementioned solution-free, fast-aging-response high-strength, high-plasticity magnesium alloy has a grain size of 5-9 μm, a yield strength of 260-300 MPa, a tensile strength of 350-380 MPa, and an elongation of 25-35%.

[0006] Compared with the prior art, the advantages of the present invention are: Compared with existing technologies, this invention achieves the following significant results only within the scope of the claims of this invention, based on the interaction, proportion, process and process parameters of the wire components: by adjusting the energy density of the laser to achieve highly concentrated and precisely controllable low heat input, the size of the molten pool and the heat-affected zone are small, which improves the forming accuracy. It can realize both simple and complex structural forming parts, with smooth parts surface and avoidance of subsequent machining, achieving near-net-shape forming. While ensuring the high strength and plasticity of the alloy, it can realize both simple and complex structures, which is particularly crucial for the manufacturing of complex thin-walled components (such as lightweight mesh structures for aerospace).

[0007] This invention can achieve a high cooling rate (≥10). 6 The K / s temperature range allows for rapid solidification of the molten pool, resulting in significant refinement of the grains and eutectic phases. The average equiaxed grain size is controlled below 10 μm, effectively suppressing the growth of coarse columnar grains, coarse eutectic phases at grain boundaries, and macroscopic elemental segregation common in magnesium alloys. Therefore, high-temperature long-term solution treatment is unnecessary; only low-temperature short-time treatment (temperature ≤190℃, time ≤5 h) is required. This significantly reduces porosity (below 0.5%) and magnesium element burn-off (burn-off rate can be controlled within 2%), thereby significantly improving the alloy's comprehensive mechanical properties, such as strength and plasticity. In terms of process stability, this technology exhibits minimal splashing, high safety, and high deposition rate, resulting in a near-net-shape surface roughness (Ra value stable at 10-30 μm) for the prepared samples. Therefore, only minimal or no subsequent machining is required before it can be used for forming mechanical components, achieving sub-millimeter-level (typically 0.5-2 mm) feature dimension forming accuracy, significantly reducing subsequent machining costs and material waste. It simultaneously improves high strength and plasticity, reduces performance anisotropy, and can produce both simple and complex structural components. Compared to existing alloys, it simplifies the process, reduces energy consumption costs, and achieves significantly higher mechanical properties than similar materials obtained using existing technologies, from simple to complex forming. Furthermore, the resulting alloy can form both simple and complex components, exhibiting excellent isotropy with no difference in mechanical properties between directions parallel and perpendicular to the travel direction. The main advantages of this invention compared to existing technologies are as follows: 1. By precisely controlling the heat input, defects such as splashing and grain coarsening caused by overheating of molten droplets are suppressed, enabling safe production. At the same time, controllable heat input ensures the stable transition of small-sized molten droplets, laying a technological foundation for achieving excellent dimensional accuracy of components.

[0008] 2. The small layer height (0.3-0.8mm) achieved by this invention results in a periodic remelting effect. Combined with the synergistic control of the process and process parameters, the treatment process not only promotes compositional homogenization, obtains a highly supersaturated solid solution structure and fine equiaxed crystals, but also suppresses macroscopic segregation, coarse columnar crystal growth, and coarse eutectic phases at grain boundaries. Unlike existing technologies that struggle to increase the solid solubility of matrix solute atoms, this invention significantly increases the solid solubility of matrix solute atoms, placing them in a supersaturated state. This high saturation accelerates aging precipitation, enabling the alloy to rapidly achieve a synergistic improvement in strength and elongation at low temperatures within a short time. Simultaneously, it achieves compositional homogenization and effectively breaks up solidified grains, generating numerous endogenous crystal nuclei, thus achieving significant grain refinement. The fine equiaxed crystal grain size is ≤10 mm. The alloy obtained by this invention can form components without traditional high-temperature solution treatment. It only requires low-temperature short-time aging to achieve a significant improvement in strength and plasticity, with a yield strength ≥248MPa, tensile strength ≥340MPa, and elongation ≥20%. This simplified heat treatment process not only greatly reduces energy consumption and manufacturing costs, but also fundamentally avoids the technical problems of component thermal deformation, dimensional deviation, and difficulty in simultaneously improving strength and plasticity caused by high-temperature long-term heat treatment.

[0009] 3. In summary, compared with traditional casting components or powder additive manufacturing processes, this invention simplifies the process, reduces costs, ensures safe production, integrates high-precision forming, can form both simple and complex structures, produces smooth surfaces of formed parts, allows for adjustable and controllable dimensions, avoids anisotropy, achieves uniform properties of components in all directions, simultaneously improves strength and plasticity, has excellent microstructure control (effectively suppressing the growth of coarse columnar crystals and surface roughness common in magnesium alloys, and breaking the severe macroscopic segregation of elements and coarse eutectic phases in existing technologies), simplifies post-process heat treatment and process parameters, obtains materials that can be directly formed near-net-shape without secondary machining, simultaneously improves alloy strength and plasticity, is conducive to industrial production and avoids high-temperature long-term solution treatment, and realizes industrial production. These advantages make it show great application potential in high-end manufacturing fields such as aerospace and biomedicine, and it is especially suitable for preparing lightweight precision structural components with stringent performance requirements. Attached Figure Description

[0010] Appendix Figure 1 The microstructure of the solution-free, fast-aging-response, high-strength, high-plasticity magnesium alloy EBSD obtained in Example 1 is shown. Detailed Implementation Example 1

[0011] (1) After removing the oxide layer on the surface of the magnesium alloy AZ31 substrate by mechanical grinding, the substrate is then ultrasonically cleaned with anhydrous ethanol to remove residual impurities, and then kept at 200 °C for 30 min to obtain the pretreated substrate. (2) Using a swing-type laser scanning method, magnesium alloy wire is subjected to 70 layers of laser additive manufacturing on the pretreated substrate obtained in step (1) and then subjected to aging treatment to obtain a solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy. The laser additive manufacturing of each layer is as follows: the laser travel adopts a ring swing mode, the laser center wavelength is 1000 nm; the laser travel speed is 0.5 m / min, the laser swing range is 2 mm, the swing frequency is 45 Hz, the laser power is 500 W, and the laser frequency is 2200 Hz; the laser and the pretreated substrate obtained in step (1) have an angle of 87° and a distance of 16 mm from the pretreated substrate; the magnesium alloy wire and the pretreated substrate obtained in step (1) have an angle of 50° and a distance of 12 mm; the wire feeding speed is 0.9 m / min; the thickness of each laser additive manufacturing layer is 0.4 mm; the aging treatment is carried out at 175 ℃ for 4 hours. h, the aforementioned solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy avoids the generation of macroscopic segregation and coarse eutectic phases at grain boundaries, exhibits a uniform microstructure, and has equiaxed fine grains with a size of 9 μm (see appendix for details). Figure 1 The yield strength is 248 MPa, the tensile strength is 340 MPa, and the elongation is 29%; the anisotropy of mechanical properties is not different; the magnesium alloy substrate in step (1) is ZK60 extruded sheet; the magnesium alloy wire in step (2) is Mg-5.0Zn-0.4Zr with a diameter of 1.2 mm. Example 2

[0012] (1) After removing the oxide layer on the surface of the magnesium alloy ZK60 substrate by mechanical grinding, the substrate is then ultrasonically cleaned with anhydrous ethanol to remove residual impurities, and then kept at 60 °C for 10 min to obtain the pretreated substrate. (2) Using a swing-type laser scanning method, 100 layers of magnesium alloy wire are laser additively manufactured on the pretreated substrate obtained in step (1) and aged to obtain a solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy. The laser additive manufacturing of each layer is as follows: the laser travels in a linear swing mode, the laser center wavelength is 1300 nm; the laser travel speed is 0.3 m / min, the laser swing range is 1.5 mm, the swing frequency is 100 Hz, the laser power is 400 W, and the laser frequency is 1200 Hz; the angle between the laser and the pretreated substrate obtained in step (1) is 100°, and the distance between the laser and the pretreated substrate is 4 mm; the angle between the magnesium alloy wire and the pretreated substrate obtained in step (1) is 60° and the distance is 5 mm; the wire feeding speed is 0.5 m / min; the thickness of each laser additive manufacturing layer is 0.3 mm; the aging treatment is carried out at 190 ℃ for 1 hour. h, the solution-free fast aging response high strength and high plasticity magnesium alloy avoids the generation of macroscopic segregation and coarse eutectic phase at grain boundaries, has a uniform microstructure, equiaxed fine grains with a size of 10 μm, a yield strength of 265 MPa, a tensile strength of 360 MPa, and an elongation of 20%; the mechanical properties have no difference in anisotropy; the magnesium alloy substrate in step (1) is AZ31 extruded sheet; the magnesium alloy wire in step (2) is Mg-8.0Zn-0.3Zr with a diameter of 0.8 mm. Example 3

[0013] (1) After removing the oxide layer on the surface of the magnesium alloy AZ31 substrate by mechanical grinding, the substrate is then ultrasonically cleaned with anhydrous ethanol to remove residual impurities, and then kept at 175 °C for 15 min to obtain the pretreated substrate. (2) Using a swing-type laser scanning method, magnesium alloy wire is subjected to 80 layers of laser additive manufacturing on the pretreated substrate obtained in step (1) and then subjected to aging treatment to obtain a solution-free, fast-aging-response, high-strength, high-plasticity magnesium alloy. The laser additive manufacturing of each layer is as follows: the laser travel adopts a ring swing mode, the laser center wavelength is 1100 nm; the laser travel speed is 1.2 m / min, the laser swing range is 3 mm, the swing frequency is 70 Hz, the laser power is 1200 W, and the laser frequency is 3100 Hz; the laser and the pretreated substrate obtained in step (1) have an angle of 80° and a distance of 20 mm from the pretreated substrate; the magnesium alloy wire and the pretreated substrate obtained in step (1) have an angle of 20° and a distance of 16 mm; the wire feeding speed is 2 m / min; the thickness of each laser additive manufacturing layer is 0.8 mm; the aging treatment is carried out at 170 ℃ for 5 minutes. h, the solution-free fast aging response high strength and high plasticity magnesium alloy avoids the generation of macroscopic segregation and coarse eutectic phase at grain boundaries, has a uniform microstructure, equiaxed fine grains with a size of 5 μm, a yield strength of 255 MPa, a tensile strength of 350 MPa, and an elongation of 23%; the mechanical properties have no difference in anisotropy; the magnesium alloy substrate in step (1) is AZ31 extruded sheet; the magnesium alloy wire in step (2) is Mg-6.5Zn-0.7Zr with a diameter of 2.0 mm.

[0014] Comparative Example 1 In their study titled "On the excellent strength-ductility synergy of wire-arc directed energy deposited Mg-Gd-Y-Zn-Zr alloy via manipulating precipitates," Xinzhi Li et al. employed wire-arc DED technology, using 1.2 mm diameter Mg-4.26Gd-2.06Y-1.18Zn-0.36Zr (wt.%) alloy welding wire as raw material. Using a bidirectional deposition strategy, they prepared thin-walled Mg-Gd-Y-Zn-Zr (GWZ421K) alloy components under process parameters of 4.5 m / min wire feed rate, 0.4 m / min travel speed, 78 A current, and 12.4 V voltage. The alloy underwent a solution treatment followed by aging (T6), with the specific parameters being: holding at 530 ℃ for 12 h followed by water quenching, and aging at 200 ℃ for 96 h. After T6 treatment, the grain size of the heat-affected zone of this alloy is ~64 μm, the grain size of the molten pool boundary and center is ~30 μm, the yield strength is 157±1.15 MPa, the tensile strength is 288±2.52 MPa, and the elongation is maintained at 16~17%.

[0015] In summary, compared with existing technologies and comparative examples, this invention omits the addition of large amounts of rare earth and other precious metal elements and high-temperature, long-term solution heat treatment. The resulting microstructure is finer and more uniform, simultaneously improving the alloy's strength and plasticity. It also eliminates the need for grinding between layers while achieving tight interlayer bonding, avoiding anisotropy and subsequent mechanical processing, thus achieving near-net-shape forming in a single step. Based on the interaction, proportion, process, and synergistic control of wire composition, this invention achieves the following results: Benefiting from the highly concentrated and precisely controllable low heat input brought by high-energy-density lasers, its molten pool size is small and the heat-affected zone is narrow, enabling sub-millimeter-level (typically 0.5-2mm) feature size forming accuracy, which is particularly crucial for the manufacture of complex thin-walled components (such as lightweight mesh structures for aerospace). In terms of metallurgical quality, it achieves a quality greater than 10... 6 The cooling rate of K / s enables rapid solidification of the molten pool, resulting in significant grain refinement with an average grain size controlled below 10 μm. Unlike existing technologies that struggle to increase the solid solubility of matrix solute atoms, this invention significantly increases the solid solubility of matrix solute atoms, placing them in a supersaturated state. This high saturation accelerates aging precipitation, effectively suppressing dendrite growth and elemental segregation common in magnesium alloys. Simultaneously, it drastically reduces porosity (below 0.5%) and magnesium element burn-off (burn-off rate controllable to within 2%), thereby significantly improving the overall mechanical properties of magnesium alloys. Regarding process stability, this technology exhibits minimal splashing, high safety, and high deposition rate. It is easily integrated with a molten pool monitoring and real-time feedback system for closed-loop precision control, avoiding subsequent machining. This results in a surface roughness (Ra value stable at 10-30 μm) of the formed part approaching near-net-shape forming levels, greatly reducing subsequent machining costs and material waste. In summary, compared with existing technologies, this invention saves on raw material additions and simplifies the process. The prepared components exhibit excellent synergy between strength and plasticity. Furthermore, for alloy systems with the same composition, its mechanical properties are significantly higher than those of alloy materials obtained by traditional casting and arc wire additive manufacturing. It can achieve both simple and complex structures. At the same time, the components also have excellent isotropy, with no difference in mechanical properties in the direction parallel to the direction of travel and perpendicular to the parallel direction. In addition, the component ratios and process parameters used in each embodiment of this invention are different, resulting in different performance and effects. This shows that the best effect of this invention is not determined by a certain component, process, or process parameter, but is achieved through the synergistic regulation of component interactions, ratios, processes, and process parameters. Moreover, only within the scope of the claims of this invention can the significantly improved technical effects be achieved.

Claims

1. A solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy, characterized in that: Its preparation method includes the following steps: (1) After removing the oxide layer on the surface of the magnesium alloy substrate by mechanical grinding, the substrate is then ultrasonically cleaned with anhydrous ethanol to remove residual impurities, and then kept at 60-200 ℃ for 10-30 min to obtain the pretreated substrate. (2) Using a oscillating laser scanning method, magnesium alloy wire is subjected to ≥5 layers of laser additive manufacturing and aging treatment on the pretreated substrate obtained in step (1) to obtain a solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy. The laser additive manufacturing of each layer is as follows: the laser travel adopts a circular or linear oscillating mode, the laser center wavelength is 1000-1300 nm; the laser travel speed is 0.3-1.2 m / min, the laser oscillation range is 1.5-3 mm, the oscillation frequency is 45-100 Hz, the laser power is 400-1200 W, and the laser frequency is 1200-3100 Hz; the angle between the laser and the pretreated substrate obtained in step (1) is 80-100°, and the distance between the laser and the pretreated substrate is 4-20 mm; the angle between the magnesium alloy wire and the pretreated substrate obtained in step (1) is 20-60°, and the distance is 5-16 mm; the wire feeding speed is 0.3-2 m / min; the thickness of each laser additive manufacturing layer is 0.3-0.8 mm; the aging treatment is carried out at 150-190 ℃ for 1-5 h; The aforementioned solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy features a smooth surface, high dimensional precision, and avoids macroscopic segregation, coarse grain boundaries, eutectic phases, and significant anisotropy. It boasts a uniform microstructure with equiaxed fine grains of ≤10μm in size. All properties are uniform, with simultaneous improvement in strength and ductility. It can accommodate both simple and complex structures and achieves sub-millimeter-level feature dimension forming accuracy of 0.5-2mm, achieving near-net-shape forming. Yield strength ≥248 MPa, tensile strength ≥340 MPa, elongation ≥20%, and no anisotropic variation in mechanical properties.

2. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 1, characterized in that: The magnesium alloy mentioned in step (1) is either Mg-Al or Mg-Zn.

3. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 1, characterized in that: The magnesium alloy wire mentioned in step (2) is one of the Mg-Zn series with a diameter of 0.8-2.0 mm.

4. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 2, characterized in that: The Mg-Al system mentioned in step (1) is one of AZ31 and AZ91, and the Mg-Zn system is one of ZK60 and ZK90.

5. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 3, characterized in that: The Mg-Zn system described in step (2) consists of the following components by mass percentage: Composition: Zn: 5.0-8.0 wt. %, Zr: 0.3-0.7 wt.%, unavoidable impurities ≤0.05%, balance Mg.

6. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 5, characterized in that: The Zn content in step (2) is 5.5-6.3 wt.%.

7. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 1, characterized in that: A high-strength, high-plasticity magnesium alloy with fast aging response and no solution treatment is obtained by using a swing-type laser scanning method to perform 10-120 layers of laser additive manufacturing on the pretreated substrate obtained in step (1) and aging treatment.

8. The solution-free, fast-aging-response, high-strength, high-ductility magnesium alloy according to claim 1, characterized in that: The aforementioned solution-free, fast-aging-response, high-strength, high-plasticity magnesium alloy has a grain size of 5-9 μm, a yield strength of 260-300 MPa, a tensile strength of 350-380 MPa, and an elongation of 25-35%.

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