Formula and preparation method of high-strength medium-plasticity magnesium alloy
阅读说明：本技术 一种高强中塑镁合金配方及其制备方法 (Formula and preparation method of high-strength medium-plasticity magnesium alloy ) 是由 刘勇 段蒙 陈杰 罗岚 京玉海 于 2020-12-02 设计创作，主要内容包括：本发明公开了一种高强中塑镁合金配方及其制备方法,涉及金属材料技术领域,其技术方案要点是：该配方包括以下质量百分数的组分：Al2.5～9.5wt.％,Zn0.5～1.5wt.％,Mn0.1～1wt.％,La0.1～1wt.％,Ce0.1～1.0wt.％,Y0.01～0.5wt.％,Ag0～0.5wt.％,余量为Mg,其中,Y、La和Ce作为稀土元素,总量不超过1wt.％。该配方能够优化制备的镁合金组织,可使镁合金中形成均匀分布的第二相和均匀细小的显微组织,使镁合金保持良好塑性的前提下具有高强度。该制备方法简单可靠,易于推广,能适应不同场合的制备要求,利于产业化应用简化合金种类,减低技术难度与生产成本。(The invention discloses a high-strength medium-plastic magnesium alloy formula and a preparation method thereof, relating to the technical field of metal materials, and the technical scheme is as follows: the formula comprises the following components in percentage by mass: 2.5-9.5 wt.% of Al, 0.5-1.5 wt.% of Zn0.1-1 wt.% of Mn0.1-1 wt.%, 0.1-1.0 wt.% of La0, 0.01-0.5 wt.% of Y, 0-0.5 wt.% of Ag and the balance of Mg, wherein Y, La and Ce are rare earth elements, and the total amount is not more than 1 wt.%. The formula can optimize the structure of the prepared magnesium alloy, and can form a uniformly distributed second phase and a uniform and fine microstructure in the magnesium alloy, so that the magnesium alloy has high strength on the premise of keeping good plasticity. The preparation method is simple and reliable, is easy to popularize, can meet the preparation requirements of different occasions, is beneficial to industrialized application, simplifies the alloy types and reduces the technical difficulty and the production cost.)
1. A high-strength medium-plastic magnesium alloy formula is characterized in that: the paint comprises the following components in percentage by mass: 2.5-9.5 wt.% of Al, 0.5-1.5 wt.% of Zn0.1-1.0 wt.% of Mn0.1-1.0 wt.%, 0.1-1.0 wt.% of La0, 0.1-1.0 wt.% of Ce0.01-0.5 wt.%, 0.01-0.5 wt.% of Ag 0-0.5 wt.%, and the balance of Mg, wherein Y, La and Ce are rare earth elements, and the total amount is not more than 1 wt.%.
2. The formula of the high-strength medium-plastic magnesium alloy as claimed in claim 1, wherein the formula comprises the following components in percentage by weight: the paint comprises the following components in percentage by mass: 8.0-9.5 wt.% of Al, 0.5-1.0 wt.% of Zn0.2-1.0 wt.% of Mn0.2-1.0 wt.%, 0.2-0.5 wt.% of La0.2-0.5 wt.%, 0.05-0.1 wt.% of Y, 0-0.5 wt.% of Ag, and the balance of Mg, wherein the total percentage of Y, La and Ce is less than or equal to 1 wt.%.
3. A preparation method of a high-strength medium-plastic magnesium alloy is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, pretreating raw materials, mixing a magnesium ingot, an aluminum ingot, a zinc ingot, a silver ingot, a Mg-Mn intermediate alloy and a Mg-RE intermediate alloy according to a mixing ratio under the protection of mixed gas of CO2 and SF6, and drying the mixed materials at the drying temperature of 100-200 ℃ for 1-2 h;
s2, smelting and casting, namely preheating the magnesium ingot, the aluminum ingot, the zinc ingot and the Mg-Mn intermediate alloy in the step S1, wherein the preheating temperature is higher than 150 ℃, then loading the preheated magnesium ingot, the aluminum ingot, the zinc ingot, the silver ingot and the Mg-Mn intermediate alloy into a smelting furnace as furnace burden, heating the furnace burden to be molten under the mixed gas of SF6 and CO2, after the furnace burden is leveled, carrying out primary slag skimming, when the temperature of the melt is increased to 750-770 ℃, carrying out secondary slag skimming, after the slag skimming is finished, adding the Mg-RE intermediate alloy into the smelting furnace, then cooling the furnace burden to the casting temperature of 700-720 ℃, carrying out heat preservation for 10-40 min to obtain melt, scraping scum on the surface of the melt, pouring the melt into a preheated mold, and cooling to obtain a magnesium alloy casting ingot;
s3, performing solid solution treatment, namely performing step solid solution treatment on the magnesium alloy ingot prepared in the step S2 at 350-450 ℃ for 6-15 h;
and S4, carrying out aging treatment or extrusion treatment on the magnesium alloy ingot subjected to the solution treatment in the step S3 to obtain a magnesium alloy finished product.
4. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the volume ratio of the mixed gas of SF6 and CO2 described in step S1 was 1: 99.
5. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the preheating temperature of the die in the step S2 is 100-250 ℃.
6. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the step solution treatment described in step S3 specifically includes the following two stages:
the first stage is as follows: the magnesium alloy ingot is subjected to heat treatment for 1-3 hours at the temperature of 300-350 ℃;
and a second stage: and (3) heating the heat treatment temperature to 400-500 ℃, carrying out heat treatment for 5-12 h, taking out, and then air-cooling to room temperature.
7. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the specific method of the extrusion processing in step S4 is: preheating the magnesium alloy ingot after the solution treatment, then extruding the preheated magnesium alloy ingot, and cooling the magnesium alloy ingot to room temperature after extrusion.
8. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the extrusion treatment in the step S4 comprises the steps of preheating a magnesium alloy ingot and an extrusion die to 300-500 ℃, preheating an extrusion cylinder to 500-600 ℃, and preheating for 1-3 h.
9. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the temperature of the aging treatment in the step S4 is 100-250 ℃, and the time of the aging treatment is 50-150 h.
10. The preparation method of the high-strength medium-plastic magnesium alloy as claimed in claim 3, which is characterized by comprising the following steps: the extrusion rate in the extrusion process in the step S4 is 0.1-1.0 m/min, and the extrusion ratio is (10-100): 1.
Technical Field
The invention relates to the technical field of metal materials, in particular to a high-strength medium-plasticity magnesium alloy formula and a preparation method thereof.
Background
The magnesium alloy is used as the lightest metal material of an engineering structure, has the advantages of high specific strength, high specific rigidity, strong electromagnetic shielding capability, good damping and shock absorption, good electric and thermal conductivity, good recyclability and the like, and has wide application prospect. With the development of the automobile, electronic and aviation industries, the application of magnesium alloys is expanded to large-scale parts and power systems, which puts higher requirements on the strength, plasticity and corrosion resistance of the magnesium alloys. The addition of rare earth elements is an effective means for improving the strength of the magnesium alloy.
The addition of rare earth elements can obviously refine crystal grains of a magnesium alloy casting structure, and the addition of a small amount of rare earth elements can promote dynamic recrystallization and activate non-basal plane slippage in the thermal deformation process, so that the crystal grain size is refined, basal plane texture is weakened, and the plasticity of the magnesium alloy is improved. At present, the rare earth magnesium alloy mostly adopts heavy rare earth elements with high content, scarce resources and high price, and has high manufacturing cost and poor substitutability. The technical process for preparing the high-performance magnesium alloy by adding a small amount of light rare earth with large storage and low price is rare.
In the prior art, Chinese patent with publication number CN104975214A discloses a high-plasticity magnesium alloy and a preparation method thereof, wherein the highest elongation of the extruded alloy is 29.1% by applying a traditional extrusion process, but the tensile strength at room temperature is only 231MPa, the addition amount of rare earth element yttrium is more than 5%, and the production cost is high. In addition, the Chinese patent with the publication number of CN111286657A discloses a high-strength Mg-Gd-Zn-Zr-Ag magnesium alloy and a preparation method thereof, the tensile strength of the extruded alloy can reach 441MPa, but the room-temperature elongation is only 4.3%, and the addition amount of rare earth element gadolinium is more than 11%.
Although the mechanical property of the magnesium alloy can be improved by adding high-content rare earth elements, the strength and the plasticity of the alloy cannot be improved at the same time; in addition, the heavy rare earth element resources are scarce and high in price, and the preparation process of the magnesium alloy with high rare earth content in the prior art is complicated and energy-consuming, so that the magnesium alloy is not suitable for large-scale industrial production. Therefore, the invention aims to design a high-strength medium-plastic magnesium alloy formula and a preparation method thereof so as to solve the problems.
Disclosure of Invention
The invention aims to provide a high-strength medium-plasticity magnesium alloy formula and a preparation method thereof, the formula can optimize the prepared magnesium alloy structure, can form a uniformly distributed second phase and a uniform and fine microstructure in the magnesium alloy, has high strength on the premise of keeping good plasticity of the magnesium alloy, and in addition, Al is formed in the magnesium alloy3La、Al2Ce and Al3The Y new phase can further improve the strength of the prepared magnesium alloy and simultaneously can effectively improve the corrosion resistance of the magnesium alloy. The preparation method is simple and reliable, is easy to popularize, can meet the preparation requirements of different occasions, is beneficial to industrialized application, simplifies the alloy types and reduces the technical difficulty and the production cost.
The technical purpose of the invention is realized by the following technical scheme: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: 2.5-9.5 wt.% of Al, 0.5-1.5 wt.% of Zn0.1-1.0 wt.% of Mn0.1-1.0 wt.%, 0.1-1.0 wt.% of La0, 0.01-0.5 wt.% of Y, 0-0.5 wt.% of Ag and the balance of Mg, wherein Y, La and Ce are used as rare earth elements, and the total amount does not exceed 1 wt.%.
The invention is further configured to: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: 8.0-9.5 wt.% of Al, 0.5-1.0 wt.% of Zn0.2-1 wt.% of Mn0.2-1 wt.%, 0.2-0.5 wt.% of La0.2-0.5 wt.%, 0.05-0.1 wt.% of Y, 0-0.5 wt.% of Ag, and the balance of Mg, wherein the total percentage of Y, La and Ce is less than or equal to 1 wt.%.
The invention is further configured to: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: al8 wt.%, zn0.5 wt.%, mn0.2 wt.%, la0.1 wt.%, ce0.3 wt.%, Y0.2 wt.%, balance Mg.
The invention is further configured to: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: al8 wt.%, zn0.5 wt.%, mn0.2 wt.%, la0.1 wt.%, ce0.3 wt.%, Y0.2 wt.%, ag0.2 wt.%, the balance Mg.
A preparation method of a high-strength medium-plasticity magnesium alloy specifically comprises the following steps:
s1, pretreatment of raw materials in CO2And SF6Under the protection of mixed gas, batching magnesium ingots, aluminum ingots, zinc ingots, silver ingots, Mg-Mn intermediate alloy and Mg-RE intermediate alloy according to batching proportion, and drying the batching at the drying temperature of 100-200 ℃ for 1-2 h;
s2, smelting and casting, namely preheating the magnesium ingot, the aluminum ingot, the zinc ingot and the Mg-Mn intermediate alloy in the step S1 at the preheating temperature higher than 150 ℃, then taking the preheated magnesium ingot, the preheated aluminum ingot, the preheated zinc ingot, the preheated silver ingot and the Mg-Mn intermediate alloy as furnace materials to be filled into a smelting furnace, and adding the furnace materials into the smelting furnace in SF6And CO2Heating the furnace burden to melt under the mixed gas, after the furnace burden is leveled, carrying out primary slagging-off, when the temperature of the melt is increased to 750-770 ℃, carrying out secondary slagging-off, after slagging-off is completed, adding Mg-RE intermediate alloy into a smelting furnace, then cooling the furnace burden to the casting temperature of 700-720 ℃, preserving heat for 10-40 min to obtain a melt, then scraping scum on the surface of the melt, pouring the scum into a preheated mold, and cooling to obtain a magnesium alloy cast ingot;
s3, performing solid solution treatment, namely performing step solid solution treatment on the magnesium alloy ingot prepared in the step S2 at 350-450 ℃ for 6-15 h;
and S4, carrying out aging treatment or extrusion treatment on the magnesium alloy ingot subjected to the solution treatment in the step S3 to obtain a magnesium alloy finished product.
The invention is further configured to: SF mentioned in step S16And CO2The volume ratio of the mixed gas is 1: 99.
The invention is further configured to: the preheating temperature of the die in the step S2 is 100-250 ℃.
The invention is further configured to: the step solution treatment described in step S3 specifically includes the following two stages:
the first stage is as follows: the magnesium alloy ingot is subjected to heat treatment for 1-3 hours at the temperature of 300-350 ℃;
and a second stage: and (3) heating the heat treatment temperature to 400-500 ℃, carrying out heat treatment for 5-12 h, taking out, and then air-cooling to room temperature.
The invention is further configured to: the specific method of the extrusion processing in step S4 is: preheating the magnesium alloy ingot after the solution treatment, then extruding the preheated magnesium alloy ingot, and cooling the magnesium alloy ingot to room temperature after extrusion.
The invention is further configured to: the extrusion treatment in the step S4 comprises the steps of preheating a magnesium alloy ingot and an extrusion die to 300-500 ℃, preheating an extrusion cylinder to 500-600 ℃, and preheating for 1-3 h.
The invention is further configured to: the temperature of the aging treatment in the step S4 is 100-250 ℃, and the time of the aging treatment is 50-150 h.
The invention is further configured to: the extrusion rate in the extrusion process in the step S4 is 0.1-1.0 m/min, and the extrusion ratio is (10-100): 1.
In conclusion, the invention has the following beneficial effects:
1. the formula of the invention can ensure that the prepared magnesium alloy has excellent mechanical properties: the rare earth elements lanthanum, cerium and yttrium effectively refine the alloy structure, promote the uniform distribution of a second phase in the alloy, prevent the growth of crystal grains and weaken the texture of a basal plane, so that the alloy has high strength (423MPa) and good plasticity (13%);
2. the formula of the invention has low cost of raw materials: the formula reduces the content of rare earth elements, and simultaneously uses light rare earth elements with abundant reserves and low price to replace heavy rare earth elements in the prior art, thereby greatly reducing the production cost;
3. the magnesium alloy prepared by the preparation method has a uniformly distributed second phase and a uniform and fine microstructure, and can effectively improve the mechanical property of the magnesium alloy;
4. the preparation method is simple and reliable and easy to popularize, adopts the casting molding and extrusion molding process, can adapt to the preparation requirements of different occasions, is beneficial to industrialized application, simplifies the alloy variety and reduces the technical difficulty and the production cost.
Drawings
FIG. 1 is a stress-strain curve for a tensile test at room temperature for a magnesium alloy of examples 1 and 2 and an alloy of comparative example AZ 80;
FIG. 2 is a photograph of the microstructure of the alloy obtained in example 1, in which FIG. 2a is a macroscopic view; FIG. 2b is a high power tissue map;
FIG. 3 is a photograph of the microstructure of the alloy obtained in example 2, in which FIG. 3a is a macroscopic view; FIG. 3b is a high power tissue map;
FIG. 4 is a photograph of the microstructure of the alloy obtained in comparative example 1, in which FIG. 4a is a macroscopic structure view; FIG. 4b is a high power tissue map;
FIG. 5 is a flow chart of the production method in examples 1 and 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples and drawings, wherein the following examples are all implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific procedures are provided, but the scope of the present invention is not limited to the following examples.
Three alloy compositions Mg-8Al-0.5Zn-0.2Mn-0.1La-0.3Ce-0.2Y (wt.%) (alloy 1), Mg-8Al-0.5Zn-0.2Mn-0.1La-0.3Ce-0.2Y-0.2Ag (wt.%) (alloy 2) were chosen as typical examples.
According to the technical scheme of the invention, pure magnesium ingots, aluminum ingots, zinc ingots, silver ingots, Mg-Mn intermediate alloy and Mg-RE intermediate alloy are proportioned according to the proportioning proportion and are smelted to prepare magnesium alloy ingots with low cost; the invented alloy is obtained through solution treatment and extrusion processing. And mechanical property test is carried out on the extruded bar, and the room temperature mechanical property test results of the examples and the comparative example AZ80 are shown in Table 1.
Example 1: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: al8 wt.%, zn0.5 wt.%, mn0.2 wt.%, la0.1 wt.%, ce0.3 wt.%, Y0.2 wt.%, balance Mg, wherein Y, La and Ce are rare earth elements, the total amount not exceeding 1 wt.%.
The preparation method of the magnesium alloy based on the high-strength medium-plasticity magnesium alloy formula specifically comprises the following steps:
s1, pretreatment of raw materials in CO2And SF6Under the protection of mixed gas, batching magnesium ingots, aluminum ingots, zinc ingots, Mg-Mn intermediate alloy and Mg-RE intermediate alloy according to batching proportion, and drying the batched materials at the drying temperature of 100-200 ℃ for 1-2 h;
s2, smelting and casting, namely preheating the magnesium ingot, the aluminum ingot, the zinc ingot and the Mg-Mn intermediate alloy in the step S1 at the preheating temperature higher than 150 ℃, then taking the preheated magnesium ingot, the preheated aluminum ingot, the preheated zinc ingot, the preheated silver ingot and the Mg-Mn intermediate alloy as furnace materials to be filled into a smelting furnace, and adding the furnace materials into the smelting furnace in SF6And CO2Heating the furnace burden to melt under the mixed gas, after the furnace burden is leveled, carrying out primary slagging-off, when the temperature of the melt is increased to 750-770 ℃, carrying out secondary slagging-off, after slagging-off is completed, adding Mg-RE intermediate alloy into a smelting furnace, then cooling the furnace burden to the casting temperature of 700-720 ℃, preserving heat for 10-40 min to obtain a melt, then scraping scum on the surface of the melt, pouring the scum into a preheated mold, and cooling to obtain a magnesium alloy cast ingot;
s3, performing solid solution treatment, namely performing step solid solution treatment on the magnesium alloy ingot prepared in the step S2 at 350-450 ℃ for 6-15 h;
and S4, carrying out extrusion treatment on the magnesium alloy ingot subjected to the solution treatment in the step S3 to obtain a magnesium alloy finished product.
The microstructure photograph of the high-strength medium-plasticity magnesium alloy obtained in the embodiment is shown in fig. 2, and the room-temperature tensile mechanical property is as follows: tensile strength is 387 MPa; elongation at break 9.4%.
Example 2: the formula of the high-strength medium-plastic magnesium alloy comprises the following components in percentage by mass: al8 wt.%, zn0.5 wt.%, mn0.2 wt.%, la0.1 wt.%, ce0.3 wt.%, Y0.2 wt.%, ag0.2 wt.%, balance Mg, wherein the Y, La and Ce are rare earth elements, the total amount not exceeding 1 wt.%.
The preparation method of the magnesium alloy based on the high-strength medium-plasticity magnesium alloy formula specifically comprises the following steps:
1) pretreating raw materials according to the formula ratio in CO2And SF6Under the protection of mixed gas, batching magnesium ingots, aluminum ingots, zinc ingots, silver ingots, Mg-Mn intermediate alloy and Mg-RE intermediate alloy according to batching proportion, and drying the batching at the drying temperature of 100-200 ℃ for 1-2 h.
2) Smelting and casting, namely preheating the magnesium ingot, the aluminum ingot, the zinc ingot, the silver ingot and the Mg-Mn intermediate alloy in the step S1 at the preheating temperature higher than 150 ℃, then taking the preheated magnesium ingot, the preheated aluminum ingot, the preheated zinc ingot, the preheated silver ingot and the Mg-Mn intermediate alloy as furnace materials to be filled into a smelting furnace, and adding the furnace materials into a furnace in SF (sulfur hexafluoride) state6And CO2Heating the furnace burden to melt under the mixed gas, after the furnace burden is leveled, carrying out primary slagging-off, when the temperature of the melt is increased to 750-770 ℃, carrying out secondary slagging-off, after slagging-off is completed, adding Mg-RE intermediate alloy into a smelting furnace, then cooling the furnace burden to the casting temperature of 700-720 ℃, preserving heat for 10-40 min to obtain a melt, then scraping scum on the surface of the melt, pouring the scum into a preheated mold, and cooling to obtain a magnesium alloy cast ingot.
3) And (4) performing solid solution treatment, namely performing step solid solution treatment on the magnesium alloy ingot prepared in the step S2 at the temperature of 350-450 ℃ for 6-15 h.
4) And (5) carrying out extrusion treatment on the magnesium alloy ingot subjected to the solution treatment in the step S3 to obtain a magnesium alloy finished product.
The microstructure photograph of the high-strength medium-plasticity magnesium alloy obtained in the embodiment is shown in fig. 3, and the room-temperature tensile mechanical property is as follows: the tensile strength is 423 MPa; elongation at break 13%.
Comparative example 1: the magnesium alloy comprises the following components in percentage by mass: al8 wt.%, zn0.5 wt.%, mn0.2 wt.%, with the balance Mg.
The magnesium alloy of the embodiment is obtained by the following preparation method according to the mixture ratio:
1) pretreating raw materials according to the formula ratio in CO2And SF6Under the protection of mixed gas, proportioning a magnesium ingot, an aluminum ingot, a zinc ingot and a Mg-Mn intermediate alloy according to the proportioning proportion, and drying the mixture at the drying temperature of 100-200 ℃ for the drying time of1～2h。
2) Smelting and casting, namely preheating the magnesium ingot, the aluminum ingot and the zinc ingot in the step S1 at the preheating temperature higher than 150 ℃, then taking the preheated magnesium ingot, the preheated aluminum ingot, the preheated zinc ingot and the Mg-Mn intermediate alloy as furnace materials to be filled into a smelting furnace, and adding the furnace materials into the smelting furnace in SF6And CO2Heating the furnace burden to melt under the mixed gas, after the furnace burden is leveled, carrying out primary slagging-off, when the temperature of the melt is increased to 750-770 ℃, carrying out secondary slagging-off, then cooling the furnace burden to the casting temperature of 700-720 ℃, preserving heat for 10-40 min to obtain a melt, scraping scum on the surface of the melt, pouring the scum into a preheated mold, and cooling to obtain a magnesium alloy cast ingot.
3) And (4) performing solution treatment, namely performing solution treatment on the magnesium alloy ingot prepared in the step S2 for 6-24 hours at the temperature of 350-450 ℃.
4) And (5) carrying out extrusion treatment on the magnesium alloy ingot subjected to the solution treatment in the step S3 to obtain a magnesium alloy finished product.
Fig. 4 shows a microstructure photograph of the magnesium alloy obtained in the present embodiment, which shows room-temperature tensile mechanical properties: the tensile strength is 338 MPa; elongation at break 9%.
Mechanical properties of the magnesium alloys obtained in the specific examples 1-2 and comparative example 1.
The preparation method of the magnesium alloy can ensure that the prepared magnesium alloy has a uniformly distributed second phase and a uniform and fine microstructure, effectively improves the mechanical property of the magnesium alloy and ensures that the prepared magnesium alloy has good corrosion resistance; meanwhile, the preparation method is simple and reliable and easy to popularize, adopts the casting molding and extrusion molding process, can adapt to the preparation requirements of different occasions, is beneficial to industrialized application, simplifies the alloy variety and reduces the technical difficulty and the production cost.
The addition of rare earth elements in the formula can obviously refine crystal grains of a magnesium alloy casting structure, and the addition of a small amount of rare earth elements can promote dynamic recrystallization and activate non-basal plane slippage in the thermal deformation process, so that the crystal grain size is refined, the basal plane texture is weakened, and the plasticity of the magnesium alloy is improved.
The magnesium alloy prepared based on the formula in the embodiment is subjected to room temperature mechanical property test, the mechanical property test is processed and tested according to the national standard GB6397-86 metal tensile test sample, the test equipment is a Labsans 30kN universal testing machine stretcher, and the stretching speed is 1 mm/min.
The test results are shown in table 1 below:
TABLE 1
The formula and the preparation method in the embodiment of the invention have the following beneficial effects:
1. the formula of the invention can ensure that the prepared magnesium alloy has excellent mechanical properties: the rare earth elements lanthanum, cerium and yttrium effectively refine the alloy structure, promote the uniform distribution of a second phase in the alloy, prevent the growth of crystal grains and weaken the texture of a basal plane, so that the alloy has high strength (423MPa) and high plasticity (13%);
2. the formula of the invention has low cost of raw materials: the formula reduces the content of rare earth elements, and simultaneously uses light rare earth elements with abundant reserves and low price to replace heavy rare earth elements in the prior art, thereby greatly reducing the production cost;
3. the magnesium alloy prepared by the preparation method has the uniformly distributed second phase and uniform and fine microstructure, can effectively improve the mechanical property of the magnesium alloy, and can ensure that the prepared magnesium alloy has good corrosion resistance;
4. the preparation method is simple and reliable and easy to popularize, adopts the casting molding and extrusion molding process, can adapt to the preparation requirements of different occasions, is beneficial to industrialized application, simplifies the alloy variety and reduces the technical difficulty and the production cost.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.