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Magnesium alloy and preparation method thereof

A magnesium alloy and weight technology, which is applied in the field of high temperature resistant rare earth magnesium alloy and its preparation, high strength and high toughness, can solve the problems of poor high temperature resistance and corrosion resistance, poor toughness, low room temperature strength of ordinary magnesium alloys, etc. Achieve the effect of improving room temperature strength, toughness and heat resistance, improving casting performance and corrosion resistance, and low density

Inactive Publication Date: 2008-06-04
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary magnesium alloys have low room temperature strength, poor toughness, high temperature resistance and poor corrosion resistance, which limits their promotion and application in wider fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition content of the magnesium alloy is: Gd 9%, Y 4%, Zr 0.5%, Zn 0.5%, and the balance is Mg, and the materials are prepared. Among them, Gd, Y, and Zn are made of pure rare earth metals, Mg is made of magnesium ingots, and Zr is made of Mg-Zr master alloy.

[0031] 1. Magnesium alloy melting

[0032] Using an intermediate frequency furnace and a graphite crucible as the melting equipment, first evenly spread a layer of surface flame retardant covering agent on the inner wall and bottom of the graphite crucible, including: 38 parts by weight of magnesium chloride, 40 parts by weight of potassium chloride, 8 parts by weight of barium chloride, Add 5 parts by weight of calcium fluoride to magnesium ingots, heat up to melt, when the temperature of the melt reaches 730-780°C, add rare earth metals according to Gd 9%, Y 4%, stir for 5-8min; add Mg according to Zr 0.5% - Zr master alloy; add Zn according to Zn 0.5%, stir for 5-8 minutes, pour after complete meltin...

Embodiment 2

[0043] According to the content described in steps 1, 2, and 3 in Example 1, a magnesium alloy extruded round bar with a diameter of 20 mm was obtained.

[0044] 1. Magnesium alloy melting

[0045]Using an intermediate frequency furnace and a graphite crucible as the melting equipment, first evenly spread a layer of surface flame-retardant covering agent on the inner wall and bottom of the graphite crucible, including: 46 parts by weight of magnesium chloride, 32 parts by weight of potassium chloride, 5 parts by weight of barium chloride, Calcium fluoride 3 parts by weight, add magnesium ingot, heat up to melt, when the temperature of the melt reaches 730-780°C, add rare earth metal according to Gd 9%, Y 4%, stir for 5-8min; add Mg according to Zr 0.5% - Zr master alloy; add Zn according to Zn 0.5%, stir for 5-8 minutes, pour after complete melting; spectroscopic sample, carry out pre-furnace analysis. If the composition is unqualified, it can be adjusted by adding ingredient...

Embodiment 3

[0056] The preparation method is the same as that of Example 1, except that the composition content of the magnesium alloy is: Gd7%, Y5%, Zr 0.6%, Zn 1.0%, and the balance is Mg, and the materials are prepared, wherein Gd, Y, and Zn adopt pure rare earth metals, Mg adopts magnesium ingot, and Zr adopts Mg-Zr master alloy. The surface flame retardant covering agent includes: 42 parts by weight of magnesium chloride, 36 parts by weight of potassium chloride, 6 parts by weight of barium chloride, and 4 parts by weight of calcium fluoride. Magnesium alloy refining agent: 55 parts by weight of potassium chloride, 15 parts by weight of barium chloride, 2.0 parts by weight of calcium fluoride, and 28 parts by weight of calcium chloride.

[0057] According to GB / T228-2002, the room temperature tensile mechanical properties of magnesium alloys are tested, and the room temperature tensile mechanical properties of the obtained magnesium alloys are: tensile strength σ b =360~400MPa, yiel...

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Abstract

The invention discloses a magnesium alloy and a method for preparing the same. The weight percentage compositions of the magnesium alloy as follows: 7 to11 percent by weight of Gd, 2 to 5 percent by weight of Y, 0.3 to 0.6 percent by weight of Zr, 0 to 1.0 percent by weight of Zn, the balance Mg and incidental impurity elements. The method for preparing the alloy comprises alloy melting, refining, casting, solid solution, extrusion deformation and two artificial aging methods, to produce heat resistant magnesium alloy extruded bar with high strength and high toughness. The tensile properties of the magnesium alloy at room temperature manufactured by adopting direct artificial aging is: tensile strength sigma b is between 450 and 480 MPa, sigma 0.2 is between 390 and 425 MPa, delta 5 is between 3 and 5 percent; when test specimen is heated to 250 DEG C for 10 min, the tensile strength sigma b is more than or equal to 300 MPa. The tensile properties of the magnesium alloy at room temperature manufactured by adopting dual artificial aging is: tensile strength sigma b is between 380 and 395 MPa, sigma 0.2 is between 280 and 290 MPa, delta 5 is between 15 and 21 percent; when test specimen is heated to 250 DEG C for 10 min, the tensile strength sigma b is more than or equal to 260 MPa. The invention produces the heat resistant magnesium alloy of high strength and high toughness with the density of no more than 1.93g / cm3, which can satisfy the demands of density, strength and toughness, and heat resistance of metal materials in specific fields.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a high-strength, high-toughness, high-temperature-resistant rare-earth magnesium alloy and a preparation method thereof. Background technique [0002] The density of magnesium alloy is about 1.74g / cm 3 , is 1 / 4 of steel, 2 / 3 of aluminum, and is by far the smallest metal in practical metal structure materials. Compared with steel and aluminum alloys, magnesium alloys have the advantages of high specific strength and specific stiffness, thermal conductivity, electromagnetic shielding, good damping and shock absorption, and good environmental compatibility. They have been used in consumer electronics, automobiles, etc. , motorcycles and aerospace and other fields have been widely used. However, ordinary magnesium alloys have low room temperature strength, poor toughness, high temperature resistance and poor corrosion resistance, which limits their promotion and...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 马志新李德富张家振李彦利
Owner GRIMAT ENG INST CO LTD
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