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High-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and preparation method of plate made of same

A wrought magnesium alloy, mg-al-re-mn technology, applied in the preparation of Mg-Al-RE-Mn wrought magnesium alloy and its plate, and the preparation of wrought magnesium alloy and its plate, can solve the problem of poor plastic deformation ability , limit the scope of use of Mg-Al magnesium alloys, reduce the strength and creep resistance of magnesium alloys, etc.

Inactive Publication Date: 2011-05-11
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation of these wrought magnesium alloys, due to the homogenization treatment in the early stage, the low melting point phase β-Mg 17 Al 12 Dissolved into the matrix, however when the alloy is served at high temperature, β-Mg 17 Al 12 The phase will precipitate from the supersaturated solid solution, and coarsen and soften, thereby reducing the strength and creep resistance of magnesium alloys, and limiting the scope of use of magnesium alloys; and Mg-Al-Si, which has better heat resistance , Mg-Al-RE and other alloys have very poor plastic deformation ability, these factors limit the scope of use of Mg-Al magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] The casting method is ordinary metal mold casting, and the secondary molding is ordinary warm extrusion to prepare the wrought magnesium alloy sheet of the present invention. Its chemical composition (weight percentage) is as follows: Al: 2.0, RE: 0.8, Mn: 0.5, and the rest are It is composed of Mg and unavoidable impurities. The unavoidable impurities are Si, Fe, Ni, Cu. The allowable weight percentage of each is: Si6 And Ar gas or CO 2 Under the protection of mixed gas atmosphere, melt the magnesium ingot in a resistance furnace at 730℃~750℃. After the magnesium is completely melted, add industrial pure aluminum and Al-Mn (or Mg-Mn) master alloy and Mg-RE master alloy. After the alloy is completely melted, stir fully to make the alloy composition uniform. The temperature is raised to 760℃~780℃, and the national standard No. 5 flux is added while stirring to refine the alloy. After refining for 5 minutes, keep it at 700℃~730℃ for 15 minutes. Then the molten magnesium all...

example 2

[0030] The alloy composition (weight percentage) prepared by the melting process in Example 1 is: Al: 4.0, RE: 2.0, Mn: 0.3, and the rest are composed of Mg and unavoidable impurities. The inevitable impurities include Si, Fe, Ni, Cu, and the allowable weight percentage of each impurity is: Si<0.007, Fe<0.003, Ni<0.003, Cu<0.003. The melted and refined alloy is cast into a square metal mold with an inner cavity size of 300mm×80mm×10mm, and then machined into a plate-shaped sample of 200mm×50mm×5mm. The rolling process is as follows: before the as-rolled alloy is prepared, the as-cast alloy is homogenized at 390° C. to achieve the goal of uniform alloy structure. The homogenized blanks are held in a preheating furnace at 390°C for 10 minutes, and then rolled, with a reduction of 12-30% per pass, and annealed at 390°C for 5 minutes between passes. The rolling speed is 2m / min; after 5 passes of rolling plastic deformation, the final thickness of the sheet is 1.4mm, and the total ...

example 3

[0032] The alloy composition (weight percentage) prepared by the smelting process in Example 1 is: Al: 9.0, RE: 3.7, Mn: 0.7, and the rest are composed of Mg and unavoidable impurities. The inevitable impurities include Si, Fe, Ni, Cu, and the allowable weight percentage of each impurity is: Si<0.005, Fe<0.003, Ni<0.003, Cu<0.003. The alloy extrusion process is as follows: homogenize the ingot at 410°C for 24 hours and then water quench and cool, and preheat the homogenized billet before extrusion at 380°C for 3 hours and then extrude. The die temperature is 380°C. The pressure ratio is 20, the extrusion speed is 4m / min, and the extruded sheet is cooled with cold water. The size of the sheet is 8mm×150mm. The extruded plate was homogenized at 410°C for 5 hours, and then the rolling experiment was carried out. The rolling temperature is 300°C. Before rolling, the extruded plate is preheated in a 300°C heating furnace for 10 minutes and then rolled for 6 passes. The reduction o...

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Abstract

The invention relates to a high-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and a preparation method of a plate made of the same. The high-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy comprises aluminum, rare earth, manganese, impurity elements (silicon, iron, nickel and copper) and magnesium. The preparation method comprises the following steps: proportionally preparing pure magnesium, pure aluminum cast ingots, magnesium-manganese (or aluminum-manganese) interalloy and magnesium-rear earth interalloy; smelting and refining by using a smelting furnace, and casting to obtain cast ingots; carrying out homogenizing treatment at 370-410 DEG C, and quenching with water; and before plastic deformation treatment, keeping the temperature at 280-400 DEG C for a period of time, and extruding and rolling, or extruding while rolling, thereby obtaining the high-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy. The high-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and the plate made of the same provided by the invention have the advantages of high toughness, high heat resistance, high plasticity and favorable hot working properties; and the product can be used as a light-weight high-toughness heat-resistant structural material to satisfy the demands of aviation, spaceflight, civil vehicles and the like for the light-weight high-toughness heat-resistant wrought magnesium alloy material.

Description

Technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a preparation method of wrought magnesium alloy and its plates, in particular to a Mg-Al-RE-Mn wrought magnesium alloy and its plates with high strength and toughness and excellent plastic workability. Preparation. Background technique [0002] Magnesium alloy has the lowest density among all structural metal materials, with a density value of 1.8g / cm 3 About 2 / 3 of aluminum and 1 / 4 of steel. Compared with other metal materials, magnesium alloys are rich in resources (approximately 2.77% of the mass of the earth's crust, ranking sixth in the surface layer of the earth's crust), low density, high specific strength and specific stiffness, excellent processing, welding and damping properties, and size It has the advantages of stability, strong electromagnetic shielding and radiation resistance, low price, and recyclability. So far, it has been successfully used in many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
Inventor 王建利王立民吴耀明王立东董含武李建平
Owner XIAN TECHNOLOGICAL UNIV
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