Heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, heat-resistant technology, applied in the field of magnesium alloys, can solve the problems of unsatisfactory use requirements, poor mechanical properties and creep resistance, etc., achieve good solid solution strengthening effect, improve mechanical properties and creep resistance , good mechanical properties and creep resistance

Inactive Publication Date: 2014-09-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical properties and creep resistance of this AE44 magnesium alloy at high tempera

Method used

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  • Heat-resistant magnesium alloy and preparation method thereof
  • Heat-resistant magnesium alloy and preparation method thereof
  • Heat-resistant magnesium alloy and preparation method thereof

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preparation example Construction

[0042] The invention provides a method for preparing a heat-resistant magnesium alloy, comprising the following steps:

[0043] 1), melting magnesium source, aluminum source, lanthanum source, samarium source and manganese source to obtain alloy liquid;

[0044] 2), die-casting the alloy liquid to obtain a heat-resistant magnesium alloy, the heat-resistant magnesium alloy comprising:

[0045] 3.5wt% to 4.5wt% of Al, 2.5wt% to 3.5wt% of La, 1.5wt% to 3.0wt% of Sm, 0.2wt% to 0.4wt% of Mn, and a total amount of impurity elements less than 0.03wt%, The balance is magnesium.

[0046] In the invention, magnesium source, aluminum source, lanthanum source, samarium source and manganese source are smelted to obtain alloy liquid. In the present invention, the melting temperature is preferably 740°C to 765°C, more preferably 750°C to 760°C, and most preferably 755°C. The present invention has no special limitation on the smelting method, and the technical scheme of metal smelting well...

Embodiment 1

[0065] Preheat 22600g of pure magnesium, 1400g of pure aluminum, 7000g of magnesium-lanthanum master alloy, 3000g of magnesium-samarium master alloy and 6000g of magnesium-manganese master alloy to 200°C. Put pure magnesium and magnesium-manganese master alloy preheated to 200°C into a crucible preheated to 320°C, and pour SF into the crucible 6 and CO 2 The mixed gas with a volume ratio of 1:100 is added to the crucible at 740°C under stirring conditions, and the above-mentioned magnesium-lanthanum master alloy and magnesium-samarium master alloy preheated to 200°C are mixed for 5 minutes to obtain the first A mixed metal liquid; adding the above-mentioned pure aluminum preheated to 200°C to the first mixed metal liquid and mixing for 15 minutes to obtain an alloy liquid; refining the alloy liquid with argon for 8 minutes, and refining The alloy solution was left to stand for 30 minutes.

[0066] Die-cast the above-mentioned molten alloy after standing on a cold-chamber die...

Embodiment 2

[0071] Preheat 20400g of pure magnesium, 1600g of pure aluminum, 8000g of magnesium-lanthanum master alloy, 4000g of magnesium-samarium master alloy and 6000g of magnesium-manganese master alloy to 200°C. Put pure magnesium and magnesium-manganese master alloy preheated to 200°C into a crucible preheated to 320°C, and pour SF into the crucible 6 and CO 2 The mixed gas with a volume ratio of 1:100 is added to the crucible at 750°C under stirring conditions, and the above-mentioned magnesium-lanthanum master alloy and magnesium-samarium master alloy preheated to 200°C are mixed for 6 minutes to obtain the first A mixed metal liquid; adding the above-mentioned pure aluminum preheated to 200°C to the first mixed metal liquid and mixing for 16 minutes to obtain an alloy liquid; refining the alloy liquid with argon for 9 minutes, and refining The alloy solution was left to stand for 35 minutes.

[0072] Die-cast the above-mentioned molten alloy after standing on a cold-chamber die...

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Abstract

The invention provides a heat-resistant magnesium alloy. The magnesium alloy comprises the following components: 3.5wt%-4.5wt% of Al, 2.5wt%-3.5wt% of La, 1.5wt%-3.0wt% of Sm, 0.2wt%-0.4wt% of Mn, impurity elements of which the total amount is less than 0.03wt% and the balance of magnesium. The invention provides a preparation method of the magnesium alloy. The preparation method comprises the steps of smelting a magnesium source, an aluminum source, a lanthanum source, a samarium source and a manganese sources to obtain an alloy liquid; carrying out press casting on the alloy liquid to obtain the heat-resistant magnesium alloy. Since the heat-resistant magnesium alloy provided by the invention contains rare earth elements, namely, La and Sm, La and Sm inhibit the generation of Mg17Al12 phase, and Sm can have a better solution strengthening effect, and thus the heat-resistant magnesium alloy provided by the invention has the advantages of good mechanical properties and creep resistance at high temperature.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the metal structure material with the lowest density in engineering applications, and magnesium alloy also has high specific strength and specific stiffness, high damping performance, good electromagnetic shielding performance, and excellent casting and machining performance. The many advantages of magnesium alloy make it have important application value and broad application prospects in the fields of automobile, 3C, aerospace, military industry and national defense. [0003] At present, the most widely used magnesium alloys in industrial production are cast magnesium alloys, especially die cast magnesium alloys. Die cast magnesium alloys include AZ (Mg-Al-Zn) series magnesium alloys, AM (Mg-Al-Mn) series magnesium alloys Alloy, AS (Mg-Al-Si) se...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/02
Inventor 孟健杨强邱鑫牛晓东卜繁强孙伟张德平田政
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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