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Multielement heat and corrosion resisting magnesium alloy and preparation method

A magnesium alloy, heat-resistant technology, applied in the field of multi-component heat-resistant casting magnesium alloy and its preparation, can solve the problems of high Sn content, achieve the effects of improving corrosion resistance, heat resistance and corrosion resistance, and increasing strength

Inactive Publication Date: 2017-06-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alloy has a high Sn content and is used as a wrought magnesium alloy without the addition of rare earth elements

Method used

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  • Multielement heat and corrosion resisting magnesium alloy and preparation method
  • Multielement heat and corrosion resisting magnesium alloy and preparation method
  • Multielement heat and corrosion resisting magnesium alloy and preparation method

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preparation example Construction

[0083] The invention also discloses a method for preparing a multi-component heat-resistant and corrosion-resistant magnesium alloy, which includes the following steps:

[0084] 1) Raw material preparation

[0085] According to the chemical composition and mass percentage of the designed alloy, pure magnesium, pure aluminum, pure zinc, pure tin, Mg-Nd master alloy, Mg-Sm master alloy, and Mg-Mn master alloy are weighed as raw materials; among them, the purity of the magnesium ingot is ≥ 99.99%, the purity of aluminum ingots is ≥99.99%, the purity of zinc ingots is ≥99.99%, the purity of tin ingots is ≥99.99%, and the impurity content of Mg-Nd, Mg-Sm and Mg-Mn master alloys is ≤0.1%.

[0086] Put the raw materials of the above components into an oven at 90-135°C to preheat for 0.5-1 hour;

[0087] 2) Alloy casting

[0088] First, put the pure magnesium ingot into the SF with a volume ratio of 1:90~110 6 and CO 2 In the mixed protective gas, heat in a melting furnace with a ...

Embodiment 25

[0094] According to the mass fraction of 7.3% Al, 3.0% Sn, 0.8% Zn, 1.2% RE (0.8% Nd and 0.4% Sm) and 0.2% Mn, the rest is Mg and the unavoidable total amount of impurities ≤ 0.2% for batching , the ingredients were baked in an oven at 120°C for 50 minutes, and then the pure magnesium ingots were put into a resistance crucible furnace, in SF 6 :CO 2 Under the protection of a volume ratio of 1:100, heat until completely melted, then raise the temperature to 680°C, add pure aluminum, pure zinc, pure tin, stir the alloy liquid after dissolution, add Mg-Nd, Mg-Sm and Mg at 700°C -Mn intermediate alloy, after the alloy is completely melted, stir the alloy liquid fully, cool down to 680°C for argon refining for 2 minutes, remove the surface scum, and the argon flow rate is 8 ml / min, then rise to 745°C and stand for 20 minutes Casting to a cast iron mold at 200°C; then put the casting into an electric furnace with a dry high-purity nitrogen atmosphere, keep it at 420°C for 20 hours,...

Embodiment 26

[0097] According to the mass fraction of 7.3% Al, 3.0% Sn, 0.8% Zn, 1.2% RE (0.8% Nd and 0.4% Sm) and 0.2% Mn, the rest is Mg and the unavoidable total amount of impurities ≤ 0.2% for batching , the ingredients were baked in an oven at 120°C for 50 minutes, and then the pure magnesium ingots were put into a resistance crucible furnace, in SF 6 :CO 2 Under the protection of a volume ratio of 1:100, heat to complete melting and then raise the temperature to 680°C, add pure aluminum, pure zinc, pure tin, stir the alloy liquid after dissolution, add Mg-Nd, Mg-Sm and Mg at 710°C -Mn intermediate alloy, after the alloy is completely melted, stir the alloy liquid fully, cool down to 690°C for argon refining for 3 minutes, remove the surface scum, and the argon flow rate is 15 ml / min, then rise to 745°C and stand for 20 minutes Casting to 200°C cast iron mold; then put the casting into an electric furnace with a dry high-purity nitrogen atmosphere, keep it at 420°C for 20 hours, then...

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Abstract

The invention discloses a multielement heat and corrosion resisting magnesium alloy and a preparation method. The alloy comprises the following components in percentage by mass: 5.8-7.8% of Al, 2.2-3.2% of Sn, 0.2-1.0% of Zn, 0.2-2.0% of RE, 0.1-0.3% of Mn, and the balance of Mg and inevitable impurities with the total quantity of not more than 0.2%. Tin, neodymium and / or samarium are added in a magnesium aluminum substrate material to form high-melting-point particle phases Nd5Sn3 and Sm5Sn3, and zinc is added to further refine the high-melting-point particle phases, so that the strong plasticity, the heat resistance and the corrosion resistance of the alloy are improved; meanwhile, remained tin and magnesium are combined to generate Mg2Sn to further improve the performances of the alloy; manganese is added to reduce harm from impurity elements to improve the corrosion resistance; and the ratio among the elements is adjusted to obtain the heat and corrosion resisting magnesium alloy.

Description

technical field [0001] The invention relates to the field of light metal materials and metallurgy technology. More specifically, the invention relates to a multi-element heat-resistant cast magnesium alloy and a preparation method thereof. Background technique [0002] With the increasing energy shortage and environmental pollution, the lightweight of the transportation field is inevitable, and it has attracted widespread attention as an environmentally friendly lightweight material. As the lightest metal structural material currently available, magnesium alloy has the advantages of high specific strength and specific stiffness, good anti-magnetic interference, excellent damping and shock absorption performance, high thermal conductivity and easy recycling. Transportation equipment manufacturing, home appliances, electronic communications, biomedicine and other fields have significant application value and huge application prospects, and have become one of the most promisin...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03
CPCC22C1/03C22C23/02
Inventor 刘国军王慧远查敏王珵杨治政罗丹荣建
Owner JILIN UNIV
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