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Gadolinium-containing die-casting thermostable high-zinc magnesium alloy and method for making same

A magnesium alloy, heat-resistant technology, applied in the field of gadolinium-containing die-casting heat-resistant high-zinc-magnesium alloy and its preparation, to achieve the effects of preventing movement, improving creep performance, and low cost

Active Publication Date: 2008-05-14
SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the deficiencies in the prior art, provide a kind of gadolinium-containing die-casting heat-resistant high-zinc-magnesium alloy and its preparation method, make it overcome the deficiencies in the high-temperature creep performance of existing Mg-Zn-Al series magnesium alloys, at the same time Ensure that the room temperature and high temperature mechanical properties of the alloy are not affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Alloy composition (percentage by weight): 8% Zn, 5% Al, 0.4% Gd, the total amount of impurity elements is less than 0.02%, and the rest is Mg.

[0017] The specific steps of the preparation process of the heat-resistant high-zinc-magnesium alloy containing gadolinium are as follows: (1) configure the alloy according to the above-mentioned components, add commercially pure magnesium into the resistance crucible furnace, and simultaneously use N 2 and SF 6 Mixed gas protection; (2) After the magnesium is completely melted, add industrial pure aluminum and industrial pure zinc at 680°C; (3) Continue to raise the temperature, add Mg-25%Gd master alloy at 730°C, and after all the alloying elements are melted, Stir the alloy liquid with a tool for 2 minutes to make the ingredients uniform; (4) lower the temperature, refine at 755 ° C, stir for 3 minutes, and then stand for 30 minutes; (5) then lower the temperature to 680 ° C, skim off the surface scum Perform die casting. ...

Embodiment 2

[0020] Alloy composition (percentage by weight): 6% Zn, 3% Al, 1.0% Gd, impurity elements less than 0.02%, and the rest being Mg.

[0021] The specific steps of the preparation process of the heat-resistant high-zinc-magnesium alloy containing gadolinium are as follows: (1) configure the alloy according to the above-mentioned components, add commercially pure magnesium into the resistance crucible furnace, and simultaneously use N 2 and SF 6 Mixed gas protection; (2) After the magnesium is completely melted, add industrial pure aluminum and industrial pure zinc at 680°C; (3) Continue to raise the temperature, and add Mg-25%Gd master alloy when the temperature reaches 735°C, and the master alloy is completely melted Finally, use a tool to stir the alloy liquid for 2 minutes to make the ingredients uniform; (4) lower the temperature, refine at 750 ° C, stir for 2 minutes, and then stand for 30 minutes; (5) then lower the temperature to 690 ° C and skim Surface dross for die cas...

Embodiment 3

[0024] Alloy composition (percentage by weight): 9.8% Zn, 6.8% Al, 0.5% Gd, impurity elements less than 0.02%, and the rest being Mg.

[0025] The specific steps of the preparation process of the heat-resistant high-zinc-magnesium alloy containing gadolinium are as follows: (1) configure the alloy according to the above-mentioned components, add commercially pure magnesium into the resistance crucible furnace, and simultaneously use N 2 and SF 6 Mixed gas protection; (2) After the pure magnesium is completely melted, add industrial pure aluminum and industrial pure zinc at 680°C; (3) Continue to raise the temperature, add Mg-25%Gd master alloy at 740°C, and wait until all the alloying elements are melted , use a tool to stir the alloy liquid for 2 minutes to make the ingredients uniform; (4) lower the temperature to 745°C, then refine, stir for 4 minutes, and then stand for 30 minutes; (5) then lower the temperature to 700°C and skim off the surface Dross for die casting.

...

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Abstract

The invention relates to die-casting and heat-resistant high zinc magnesium alloy with gadolinium content and preparation method thereof and is used in the metal material field. The alloy components and weight percentages thereof are that: Zinc: 6-10 percent, aluminum: 3-7percent, gadolinium: 0.2-2.0 percent, impurity element Fe is less than 0.005 percent, Cu is less than 0.015 percent, Ni is less than 0.002 percent and the rest is magnesium. Pure magnesium, pure zinc, pure aluminum and Mg-25percent Gd are preheated, and then the pure magnesium is put into a melting furnace with the protection of gas to be melted; the pure zinc and the pure aluminum are added immediately after magnesium ingot is thoroughly melted, and scum on the surface is skimmed after the pure zinc and the pure aluminum are thoroughly melted; the temperature rises continuously, Mg-25 percent Gd master alloy is added, and scum on the surface is skimmed after the master alloy is completely melted; melted mixture obtained is stirred, and then refined, stirred and led to be still after the furnace temperature is adjusted; alloy liquid obtained is die-cast after scum on the surface is skimmed and the temperature of the alloy liquid is adjusted down. The invention has low cost and high production efficiency, and improves mechanical properties of the alloy in room temperature and high temperature and creep properties of the alloy.

Description

technical field [0001] The invention relates to a magnesium alloy in the field of material technology and a preparation method thereof, in particular to a gadolinium-containing die-casting heat-resistant high-zinc-magnesium alloy obtained by adding gadolinium and a preparation method thereof. Background technique [0002] With the rapid development of my country's aerospace industry and automobile industry, the lightweight of spacecraft and automobiles has become an eternal pursuit. Magnesium alloys have become the focus of material workers because of their high specific strength, specific stiffness, and specific modulus of elasticity. However, due to the poor high-temperature creep resistance of existing magnesium alloys, they cannot be used to manufacture automotive transmission parts that require high-temperature creep performance, which greatly hinders the further application of magnesium alloys. For this reason, the research and development of heat-resistant magnesium ...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/02C22C23/04C22C1/03B22D21/04
Inventor 王渠东金正力郑江
Owner SHANGHAI LIGHT ALLOY NET FORMING NAT ENG RES CENT
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