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CN-121976073-A - Preparation method of rare earth magnesium alloy

CN121976073ACN 121976073 ACN121976073 ACN 121976073ACN-121976073-A

Abstract

The invention provides a preparation method of rare earth magnesium alloy, belonging to the technical field of magnesium alloy preparation. The rare earth magnesium alloy comprises the following raw materials, by mass, 3-6% of Gd, 0.8-2.2% of Er, 1.0-1.4% of Zn, 0.1-0.5% of Zr, and the balance of magnesium and unavoidable impurities, wherein the raw material powder is subjected to ball milling treatment to obtain a powder mixture, and the powder mixture is subjected to 3D printing and electrostatic field auxiliary aging treatment to obtain the rare earth magnesium alloy. According to the invention, the rare earth magnesium alloy is prepared by adding Gd, er, zr, zn elements, so that the strength of the magnesium alloy is improved. The invention prepares the rare earth magnesium alloy by combining the laser selective melting technology with the electrostatic field auxiliary aging treatment, thereby avoiding the defects of air holes, segregation and the like in the traditional casting technology.

Inventors

  • NING HUIYAN
  • LI BAIQIU
  • AN LI
  • JIANG XU
  • BI FENGYANG
  • HOU LONGFEI
  • DENG SHEN

Assignees

  • 黑龙江工程学院

Dates

Publication Date
20260505
Application Date
20260202

Claims (8)

  1. 1. The preparation method of the rare earth magnesium alloy is characterized by comprising the following raw materials, by mass, 3-6% of Gd, 0.8-2.2% of Er, 1.0-1.4% of Zn, 0.1-0.5% of Zr, and the balance of magnesium and unavoidable impurities; The preparation method of the rare earth magnesium alloy comprises the following steps: (1) Ball milling the raw material powder to obtain a powder mixture; (2) And 3D printing and electrostatic field auxiliary aging treatment are carried out on the powder mixture, so that the rare earth magnesium alloy is obtained.
  2. 2. The preparation method of the rare earth magnesium alloy according to claim 1, wherein the rare earth magnesium alloy comprises the following raw materials, by mass, 4-5% of Gd, 1.4-1.8% of Er, 1.0-1.4% of Zn, 0.1-0.5% of Zr, and the balance of magnesium and unavoidable impurities.
  3. 3. The method for preparing a rare earth magnesium alloy according to claim 2, wherein the rare earth magnesium alloy comprises the following raw materials by mass percent, 4.5% of Gd, 1.6% of Er, 1.2% of Zn, 0.4% of Zr, and the balance of magnesium and unavoidable impurities.
  4. 4. The method for preparing a rare earth magnesium alloy according to any one of claims 1 to 3, wherein the raw materials of the rare earth magnesium alloy further comprise dysprosium, and the mass percentage of the dysprosium is 0.2 to 0.8%.
  5. 5. The method for producing a rare earth magnesium alloy according to claim 4, wherein in the step (1), the rotation speed of the ball milling treatment is 80 to 100rpm, and the time is 3 to 5 hours.
  6. 6. The method for preparing rare earth magnesium alloy according to claim 2, 3 or 5, wherein in step (2), the 3D printing is performed in an inert atmosphere by using a laser selective melting technique.
  7. 7. The method for preparing rare earth magnesium alloy according to claim 6, wherein in the step (2), the parameters of 3D printing are that the laser power is 100-300W, the laser spot diameter is 30-50 μm, the powder spreading thickness is 40-60 μm, the laser scanning speed is 100-300 mm/s, the scanning interval is 80-120 μm, the scanning strategy is strip scanning, and the angle is 67 °.
  8. 8. The method for preparing a rare earth magnesium alloy according to claim 5 or 7, wherein in the step (2), the temperature of the electrostatic field auxiliary aging treatment is 200-300 ℃, the electrostatic field voltage is 1-4 kv, and the time is 1-3 h.

Description

Preparation method of rare earth magnesium alloy Technical Field The invention relates to the technical field of magnesium alloy preparation, in particular to a preparation method of rare earth magnesium alloy. Background The magnesium alloy is used as a lightweight material and has many advantages that firstly, the weight is light, the density of the magnesium alloy is about 1.8g/cm 3, the density is only 2/3 of that of the aluminum alloy, and 1/4 of that of steel, the whole car can be lightened, so that oil consumption and carbon emission are reduced, secondly, the casting performance is good, the reaction rate of magnesium and iron is extremely low, the melting loss of a die casting mold is low, the service life of the die casting mold is high, the melt viscosity is relatively low, the filling fluidity is good, the cavity filling difficulty is reduced, thirdly, the damping coefficient of the magnesium alloy is higher, and the damping coefficient of the magnesium alloy is 15 times that of the aluminum alloy and 60 times that of the steel respectively, so that noise and vibration can be reduced, and the safety and the comfort of the car are improved. The magnesium alloy can be classified into a cast magnesium alloy and a deformed magnesium alloy according to the process, the cast magnesium alloy mainly comprises AZ, AM, AS, AE systems and the like according to different main additive elements, the tensile strength is 170-260 MPa, the yield strength is 110-170 MPa, and the elongation after fracture is 1-5%. The common marks of the wrought magnesium alloy are ZK61M, AZ, A, AZ, 61, A, AZ B and the like, the tensile strength is 220-310 MPa, the yield strength is 140-245 MPa, and the elongation after fracture is 2-8%. The cast magnesium alloy generally adopts a high-pressure casting process, but has lower performance, is easy to have air hole defects and is not suitable for structural members bearing larger loads. The deformed magnesium alloy has a small proportion in automobile parts and is generally used for wheels and carriages. As magnesium alloy is increasingly applied to automobiles, problems are gradually exposed, and the magnesium alloy is limited by the mechanical and molding properties, connection corrosion resistance and other aspects of magnesium alloy materials, so that the magnesium alloy is difficult to apply in batches. The common magnesium alloy material has low strength and elongation, is unfavorable for the design and manufacture of the structural reliability of the product, and has high failure risk under fatigue working conditions. The magnesium alloy generates an undensified magnesium oxide film layer in the air, and the magnesium oxide film layer is inevitably contacted with the aqueous solution in the use process, so that H 2O、OH- or O 2 in the aqueous solution is difficult to effectively isolate, and the substrate is further corroded. Therefore, research on a preparation method of the rare earth magnesium alloy has important significance in improving mechanical properties and corrosion resistance. Disclosure of Invention The invention aims to provide a preparation method of rare earth magnesium alloy, which aims to solve the problems of low strength and poor corrosion resistance of magnesium alloy in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a preparation method of a rare earth magnesium alloy, which comprises the following raw materials, by mass, 3-6% of Gd, 0.8-2.2% of Er, 1.0-1.4% of Zn, 0.1-0.5% of Zr, and the balance of magnesium and unavoidable impurities; The preparation method of the rare earth magnesium alloy comprises the following steps: (1) Ball milling the raw material powder to obtain a powder mixture; (2) And (3) performing 3D printing and electrostatic field auxiliary aging treatment on the powder mixture to obtain the rare earth magnesium alloy. Preferably, the rare earth magnesium alloy comprises the following raw materials, by mass, 4-5% of Gd, 1.4-1.8% of Er, 1.0-1.4% of Zn, 0.1-0.5% of Zr, and the balance of magnesium and unavoidable impurities. Preferably, the rare earth magnesium alloy comprises the following raw materials in percentage by mass of 4.5% of Gd, 1.6% of Er, 1.2% of Zn, 0.4% of Zr and the balance of magnesium and unavoidable impurities. Preferably, the rare earth magnesium alloy further comprises dysprosium, wherein the mass percentage of the dysprosium is 0.2-0.8%. Preferably, in the step (1), the rotation speed of the ball milling treatment is 80-100 rpm, and the time is 3-5 hours. Preferably, in the step (2), the 3D printing is performed by using a laser selective melting technology, and the 3D printing is performed in an inert atmosphere. Preferably, in the step (2), the parameters of the 3D printing are that the laser power is 100-300W, the laser spot diameter is 30-50 μm, the powder spreading thickness is 40-60 μm, the laser scanning speed is 100-