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Si, Mg and Zr micro-alloyed AlCuMn heat-resistant aluminum alloy and heat treatment process

A micro-alloying and alloying technology, which is applied in the field of alloy materials, can solve the problem that the heat resistance of alloys has little effect

Active Publication Date: 2022-02-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the problem with Si is that at higher temperatures, it has little effect on the long-term heat resistance of the alloy

Method used

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  • Si, Mg and Zr micro-alloyed AlCuMn heat-resistant aluminum alloy and heat treatment process
  • Si, Mg and Zr micro-alloyed AlCuMn heat-resistant aluminum alloy and heat treatment process
  • Si, Mg and Zr micro-alloyed AlCuMn heat-resistant aluminum alloy and heat treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Using graphite crucible smelting and iron mold casting to prepare alloy ingots, using raw materials as high-purity aluminum, pure magnesium, Al-50%Cu, Al-10%Mn, Al-24%Si, Al-10%Zr Intermediate alloy. First put high-purity aluminum into a graphite crucible, heat and melt it in a high-temperature melting furnace at 800±5℃, and then add Al-50%Cu, Al-10%Mn, Al-24%Si, Al-10%Zr intermediate Alloy, when adding pure Mg, it needs to be wrapped with aluminum foil to reduce the burning loss of Mg, and then fully stirred. After it is fully melted, C 2 Cl 6 Degassing, stirring, heat preservation and standing, and then iron mold casting to obtain an ingot. Four kinds of alloy materials with different compositions were prepared, and the actual composition of the alloy was obtained by XRF test, as shown in Table 1:

[0037] Table 1: Composition table of alloys measured by XRF

[0038]

Embodiment 2

[0039] Embodiment 2: After the 1#, 2#, 3#, 4# as-cast alloys in Example 1 are heated from room temperature for 6h to 540°C, after solution treatment for 7h, water quenched to room temperature in 10s, at 150 °C. After the isothermal aging at ℃ reaches the peak value, it is then aged at 150 ℃ for a long time to obtain the aging hardness curves of the four alloys at this temperature, such as figure 1 shown. As can be seen from the figure, at this temperature, comparing the 1# and 3# alloys, after 768h, the hardness value of the 1# alloy began to decrease rapidly, while the 3# alloy remained stable. Comparing the 3# and 4# alloys, the hardness value of the 4# alloy has been significantly higher than that of the 3# alloy, indicating that the composite addition of Si and Mg can significantly improve the aging hardness and thermal stability of the alloy at lower temperatures. Comparing the 2# and 3# alloys, it can be seen that Zr does not work at lower temperatures.

Embodiment 3

[0040] Example 3: The 3# and 4# as-cast alloys in Example 1 were heated from room temperature for 6h to 540°C, and after solution treatment for 7h, water quenched to room temperature in 10s, and after isothermal aging at 175°C reached a peak value. , and then aged at 175 °C for a long time to obtain the aging hardness curves of the two alloys at this temperature, such as figure 2 shown. It can be seen from the figure that the hardness value of 4# alloy is always significantly higher than that of 3# alloy in the long-term aging process, indicating that the aging strengthening effect of Si is also very significant at this temperature.

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Abstract

The invention discloses a Si, Mg and Zr micro-alloyed AlCuMn heat-resistant aluminum alloy and a heat treatment process, and belongs to the technical field of heat-resistant alloy materials. The alloy comprises the following components in percentage by weight: 4%-5.6% of Cu, 0%-0.35% of Mg, 0.2%-0.4% of Mn, 0%-0.3% of Zr, 0%-0.3% of Si and the balance of high-purity aluminum. According to the invention, Si, Mg and Zr micro-alloying and different heat treatment processes are adopted, so that the heat stability of the alloy is improved, and the alloy has higher strength under long-time heat exposure at 225-325 DEG C and keeps good heat stability.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to the preparation and heat treatment process of a microalloyed heat-resistant alloy. [0002] technical background [0003] With the application of aluminum alloys in aerospace, transportation, weaponry and other fields more and more widely, the requirements for aluminum alloys with special properties are getting higher and higher, such as high-temperature heat-resistant aluminum alloys. At present, microalloying is an important means of optimizing the composition of aluminum alloys. It aims to optimize the microstructure of the alloy through the addition of trace elements, and then significantly improve the mechanical properties of the alloy material. Therefore, it has been continuously valued and developed by the academic and industrial circles. [0004] Al-Cu-Mg series alloy is a typical heat-treatable aluminum alloy, which has been widely used in aerospace an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/14C22C21/16C22C1/03C22F1/057
CPCC22C21/14C22C21/16C22C1/026C22C1/03C22F1/057
Inventor 文胜平吴美娴吴晓蓝魏午高坤元黄晖聂祚仁
Owner BEIJING UNIV OF TECH
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