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Prepn of high strength heat resistant aluminium alloy and its pipe

An aluminum alloy, heat-resistant technology, applied in the field of high-performance structural materials, to achieve the effects of improving heat resistance, reducing waste, and saving equipment power

Inactive Publication Date: 2007-08-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Al-Cu-Mg-Ag alloy pipes have not yet been prepared by reverse hot extrusion

Method used

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  • Prepn of high strength heat resistant aluminium alloy and its pipe

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Experimental program
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Effect test

Embodiment 1

[0022] Alloy ingredients (raw materials: A00 pure aluminum, electrolytic copper, No. 2 industrial pure magnesium, 99.9% silver, electrolytic manganese, Cu-50Zr master alloy, Al-2.5Ti master alloy) are first put in the ZGG-0.025A vacuum melting furnace Melting, and then adopting the method of argon protection casting to make small-sized ingot alloys of φ80.5mm. The ingot alloy is machined to remove the head and tail, and then a certain number of small-sized ingot alloys are smelted in a flame coke furnace. The covering agent uses the configured sodium salt 2# flux (composition: 39% NaCl + 50% KCl + 6.6%Na 3 AlF 6 +4.4%CaF 6 ), the degasser is C 2 Cl 6 , after standing still and removing slag, in a copper mold buried in wet sand, a large-sized cylindrical ingot was poured in the form of reverse casting (Figure 1). After the alloy ingot was homogenized at 500°C for 12 hours, the surface was machining. The processed ingot is kept at 400°C for 5 hours, and the extrusion ratio...

Embodiment 2

[0024] Alloy ingredients (raw materials: AOO pure aluminum, electrolytic copper, No. 2 industrial pure magnesium, 99.9% silver, electrolytic manganese, Cu-50Zr master alloy, Al-2.5Ti master alloy) are first put in the ZGG-0.025A vacuum melting furnace Melting, and then adopting the method of argon protection casting to prepare a small-sized ingot alloy of φ80.5mm. The ingot alloy is machined to remove the head and tail, and then a certain number of small-sized ingot alloys are melted in a flame coke furnace. The covering agent is 2# flux of sodium salt, and the degassing agent is C 2 Cl 6 , after standing still and removing slag, in a copper mold buried in wet sand, a large-sized cylindrical ingot is poured in the form of reverse casting. After the alloy ingot is homogenized at 480°C for 18 hours, the surface is machined. The processed ingot is kept at 380°C for 5 hours, and the extrusion ratio is 6.5 on a 45 MN double-acting reverse extrusion machine. Through reverse hot ext...

Embodiment 3

[0026] Alloy ingredients (raw materials: A00 pure aluminum, electrolytic copper, No. 2 industrial pure magnesium, 99.9% silver, electrolytic manganese, Cu-50Zr master alloy, Al-2.5Ti master alloy) are first put in the ZGG-0.025A vacuum melting furnace Melting, and then adopting the method of argon protection casting to prepare a small-sized ingot alloy of φ80.5mm. The ingot alloy is machined to remove the head and tail, and then a certain number of small-sized ingot alloys are melted in a flame coke furnace. The covering agent is 2# flux of sodium salt, and the degassing agent is C 2 Cl 6, after standing still and removing slag, in a copper mold buried in wet sand, a large-sized cylindrical ingot is poured in the form of reverse casting. After the alloy ingot is homogenized at 490°C for 15 hours, the surface is machined. The processed ingot is kept at 410°C for 5 hours, and the extrusion ratio is 10 on a 45 MN double-acting reverse extrusion machine. Through reverse hot extru...

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Abstract

The preparation of high strength heat resistant aluminum alloy and its pipe belongs to the field of high performance structural material. Chemically, the high strength heat resistant aluminum alloy consists of Cu 5-6.5 wt%, Mg 0.6-1.0 wt%, Ag 0.5-0.7 wt%, Mn 0.4-0.6 wt%, Zr 0.05-0.25 wt%, Ti 0.1-0.2 wt% and Al for the rest. The aluminum alloy material may be prepared into pipe of outer diameter of 185-215 mm and wall thickness of 21-25 mm through reverse hot extrusion in low extrusion ratio of 3-10. The aluminum alloy material has tensile strength at room temperature higher than 510 MPa, elongation higher than 7.0 % and tensile strength at 200 deg.c higher than 400 MPa, and is superior to available No. 2618 heat resistant aluminum alloy.

Description

technical field [0001] The invention belongs to the field of high-performance structural materials, and in particular relates to a low-extrusion-ratio high-strength heat-resistant aluminum-copper-magnesium-silver alloy and a preparation method thereof. Background technique [0002] Aluminum-copper-magnesium heat-resistant aluminum alloys are typical age-hardening aluminum alloys, and their main alloying elements are Al, Cu, Mg, Mn, Zr, etc., and are used as Aerospace structural materials. At present, the heat-resistant aluminum alloys widely used in industry are 2618 aluminum and 2219 aluminum alloys containing Cu and Mg. The typical composition of 2618 aluminum alloy is: 2.3wt% Cu ~ 1.6wt% Mg ~ 1.1wt% Fe ~ 1.0wt% Ni ~ 0.18wt% Si ~ 0.05wt% Ti, the rest is Al, and its room temperature tensile strength σ b 441MPa, σ at 200°C b It is 321MPa. Another typical heat-resistant aluminum alloy is 2219 aluminum alloy, its typical composition is 6.3wt%Cu~0.3wt%Mn~0.18wt%Zr~0.10wt%V~...

Claims

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Application Information

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IPC IPC(8): C22C21/12C22C1/02B22D21/00C22F1/057
Inventor 肖代红陈康华宋旼
Owner CENT SOUTH UNIV
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