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Manganese aluminium silicon-lithium rare earth alloy and preparation method thereof
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A rare earth alloy, magnesium-aluminum-silicon technology, applied in the field of aluminum-magnesium alloys, can solve the problems of combustion, difficulty in alloy production, erosion, etc.
Inactive Publication Date: 2006-12-13
江阴鑫裕装潢材料有限公司
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However, due to the extremely active lithium element, it is easy to oxidize or even burn in the atmosphere, and has a strong binding force with hydrogen, and it is easy to react with the furnace lining material, corrode the crucible, and form a large amount of slag inclusions that are involved in the ingot.
At the same time, lithium itself is very easy to segregate during the melting and casting process, and there is a risk of explosion during casting, so the production of the alloy is very difficult, and aluminum-lithium alloys cannot be smelted and cast by conventional methods.
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Embodiment 1
[0024] Alloy composition (mass percentage) is: Al: 11%, La: 0.8%, Ce: 0.8%, Li: 1.4%, Pr: 0.30%, Mn: 0.5%, Zn: 0.4%, Sr: 1.5%, Si : 0.08%. Unavoidable impurity elements are limited to: Cu≤0.004%, Ni≤0.002%, Fe≤0.004%, and the rest is Mg. Industrial pure Mg, industrial pure Al, industrial pure Li, industrial pure Si, Mg-LaPrCe master alloy (the total amount of LaPrCe accounts for 20%, wherein La: Ce: Pr = 6: 3: 1), Mg-Ce master alloy (Ce: 20%), Mg-Pr master alloy (Pr: 10%), Al-Mn master alloy, industrial pure zinc, metal Sr, and formulate the alloy according to the above ingredients. In a protective atmosphere (CO 2 :N 2 =150:100) in the magnesium alloymelting furnace, first melt Mg, Al, Li and Si, after Mg, Al, Li and Si are melted, then add Mg-LaPrCe, Mg-Ce, Mg-Pr, Al-Mn Intermediate alloy and Zn, finally add metal Sr, after all the alloy elements are melted, (about 710°C), raise the temperature to 730°C, let it stand for 30 minutes, control the temperature not to exceed...
Embodiment 2
[0026] Alloy composition (mass percentage) is: Al: 11.5%, La: 0.8%, Ce: 0.8%, Li: 1.8%, Pr: 0.30%, Mn: 0.5%, Zn: 0.4%, Sr: 0.08%, Si : 0.08%. Unavoidable impurity elements are limited to: Cu≤0.004%, Ni≤0.002%, Fe≤0.004%, and the rest is Mg. Industrial pure Mg, industrial pure Al, industrial pure Li, industrial pure Si, Mg-LaPrCe master alloy (the total amount of LaPrCe accounts for 20%, wherein La: Ce: Pr = 6: 3: 1), Mg-Ce master alloy (Ce: 20%), Mg-Pr master alloy (Pr: 10%), Al-Mn master alloy, industrial pure zinc, metal Sr, and formulate the alloy according to the above ingredients. In a protective atmosphere (CO 2 :N 2 =150:100) in the magnesium alloymelting furnace, first melt Mg, Al, Li and Si, after Mg, Al, Li and Si are melted, then add Mg-LaPrCe, Mg-Ce, Mg-Pr, Al-Mn Intermediate alloy and Zn, finally add metal Sr, after all the alloy elements are melted, (about 710°C), raise the temperature to 730°C, let it stand for 30 minutes, control the temperature not to exc...
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Abstract
The invention relates to a magnesia-alumina-silica -lithiumrare earthalloy, and the component consists of the following elements (mass %): 10-11.5 % aluminum, 0.1-1.0 % manganese, 0.1-0.8 % Lanthanun, 1-2 % lithium, 0.1-0.8 % cerium, 0.05-0.3 % praseodymium, 0.1-0.5 % Zn, 0.2-1.5 % strontium, 0.08-0.1 % silicon, and the residues are magnesium and uncontrollable impurity. The raw materials are: manganese adopts aluminium-manganese middle alloy, Lanthanun, praseodymium and cerium adopt magnesium-Lanthanun enriched,magnesium - praseodymium enriched, magnesium-cerium enriched and magnesium-Lanthanunpraseodymiumcerium enriched hardener with 15-25% rare-earth content and in magnesium-Lanthanun-praseodymium-cerium enriched hardener the proportion of Lanthanun, praseodymium and cerium is 5.5-6.5:2.5-3.5:1. The specific industrial process of this method includes: first melting magnesium, aluminum, lithium and silicon in smelter with protective atmosphere of 1.3-1.7:1 carbon dioxide and nitrogen, then adding magnesium-Lanthanun, magnesium- praseodymium, magnesium-cerium and magnesium - Lanthanunpraseodymiumcerium hardener, aluminum-manganese hardener and Znic, finally adding metallic strontium, when the temperature reduces to 710 DEG C+-10 DEG C, skimming, ingoting or diecasting. The alloy of this invention has good corrosion resisting property.
Description
Technical field: [0001] The invention relates to an aluminum-magnesium-silicon-lithium rare earth alloy for construction and a preparation method thereof. The invention belongs to the technical field of aluminum-magnesium alloy. Background technique: [0002] Traditional aluminum alloys include aluminum-lithium alloys for aerospace, automotive and aluminum-magnesium alloys for construction. [0003] Lithium has an atomic number of 3 and a density of 0.53 g / cm 3 , is the lightest of the metals. Aluminum-lithium alloy (Al-Li-Cu-Zr alloy) contains 1% to 2% lithium, which can reduce the alloy density by 5% to 6%, increase the rigidity by 13%, and increase the specific rigidity by 15% to 20%. Aluminum-lithium alloys have higher specific rigidity and specific strength, and especially significantly improve the corrosion resistance of aluminum-magnesium alloys when the aluminum content is high. What is particularly noticeable is that the specific rigidity is higher than that of o...
Claims
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