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Ce-Mg-containing high-strength heat-resistant aluminum alloy and preparation method thereof

An aluminum alloy, heat-resistant technology, applied in the field of metal material engineering, can solve problems such as rise, and achieve the effect of simple melting process, good casting performance and reducing viscosity

Pending Publication Date: 2021-04-06
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, as the service temperature increases, the solid solubility of Mg in the Al matrix increases, and as time goes on, the Mg element diffuses more and more uniformly, so that the strength of the alloy does not decrease, but increases

Method used

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  • Ce-Mg-containing high-strength heat-resistant aluminum alloy and preparation method thereof
  • Ce-Mg-containing high-strength heat-resistant aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]A high-strength heat-resistant aluminum alloy containing Ce-Mg, including the following components and their weight percentages: Ce: 10%; Mg: 6%; the balance is Al.

[0035] A preparation method of a high-strength heat-resistant aluminum alloy containing Ce-Mg comprises the following steps:

[0036] S1: Making Ce elemental substance and Al elemental substance into aluminum-cerium alloy, and purifying the produced aluminum-cerium alloy;

[0037] S2: According to the chemical composition and stoichiometric ratio of the alloy, calculate the amount of raw materials required, preheat industrial pure aluminum ingots, magnesium ingots, and aluminum-cerium alloy raw materials to 170°C, and keep warm for 40 minutes;

[0038] S3: Add the preheated industrial pure aluminum and 2 / 3 of the aluminum-cerium alloy into the preheated crucible, and heat it to 760°C to melt. After all of them are melted, add pure magnesium and the remaining 1 / 3 Aluminum-cerium alloy, heat preservation for...

Embodiment 2

[0044] The difference between Example 2 and Example 1 is that the mass percentages of Ce, Mg and Al added during preparation are different.

Embodiment 3

[0045] The difference between embodiment 3 and embodiment 1 is: the preparation method is not the same, the copper mold wall thickness of step 3 in embodiment 1 is 15mm, and the copper mold wall thickness of step 3 in embodiment 3 is 10mm.

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Abstract

The invention relates to a Ce-Mg-containing high-strength heat-resistant aluminum alloy and a preparation method thereof, and belongs to the field of metal material engineering. Chemical components of the Ce-Mg-containing high-strength heat-resistant aluminum alloy include, by weight, 8-12% of Ce, 4-8% of Mg and the balance Al. The preparation method of the Ce-Mg-containing high-strength heat-resistant aluminum alloy comprises the first step smelting and the second step of pouring and quick solidification. According to the heat-resistant aluminum alloy, the heat resistance is mainly improved by adding Ce to form an Al11Ce3 intermetallic compound, and the high-temperature strength is improved through a solid solution of the Mg element. The Ce-Mg-containing high-strength heat-resistant aluminum alloy and the preparation method have the beneficial effects that the yield strength in the high-temperature service process is increased instead of being reduced, the yield strength at the room temperature is 180-210 MPa, and the yield strength after 1000 hours of heat exposure at the temperature being 400 DEG C is 200-250 MPa. Various microalloy elements do not need to be added, the design cost is low, the preparation technological process is short, the stability is high, and the Ce-Mg-containing high-strength heat-resistant aluminum alloy and the preparation method can be used for cast aluminum alloys with high heat resistance requirements.

Description

technical field [0001] The invention relates to the field of metal material engineering, in particular to a high-strength heat-resistant aluminum alloy containing Ce-Mg and a preparation method thereof. Background technique [0002] Aluminum alloy is an ideal structural material due to its excellent castability, excellent machinability and low cost. Aluminum alloys solve the gap between the high density of steel materials and the expensiveness of titanium alloy materials, and are used in the automotive and aerospace industries due to their high specific strength, corrosion resistance, and high thermal conductivity. However, with the rapid development of aerospace and automobile industries, higher requirements are put forward for aluminum alloy materials, that is, good high temperature performance. The typical strengthening mechanism of traditional cast aluminum alloys (Al-Si, Al-Cu) is precipitation strengthening, that is, the stiffness and strength of the alloy are increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03
CPCC22C21/00C22C1/03C22C1/026
Inventor 管仁国叶洁云付莹张晋铁镝陈继强李冰王长峰姜巨福李晓阳
Owner DALIAN JIAOTONG UNIVERSITY