Directly extrusion cast high strength aluminium alloy

A squeeze casting, high-strength technology, applied in the field of aluminum alloy materials, can solve the problems of large hot cracking tendency, poor casting performance, poor fluidity, etc., and achieve the effects of good plasticity, reduced casting process requirements, and high strength

Inactive Publication Date: 2006-03-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned cast aluminum alloys have high strength, the casting performance of these alloys is poor, which is manifested in the tendency of hot cracking, poor fluidity and difficulty in feeding.
Therefore, the sand casting process is mainly used at present, which greatly limits the performance potential of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1: Ingredients

[0014] Composition Specification Mass percentage dosage

[0015] Pure aluminum ingot Al99.8 77.1%

[0016] Aluminum copper alloy 50% Cu 9%

[0017] Aluminum manganese alloy 10% Mn 6%

[0018] Pure magnesium ingot 1.4%

[0019] Aluminum-zirconium alloy 10% Zr 1%

[0020] Aluminum vanadium alloy 4%V 2.5%

[0021] Aluminum titanium boron alloy 5% Ti, 1% B 2%

[0022] Aluminum rare earth alloy 10% RE 1%

[0023] Step 2: Smelting

[0024] The alloy is melted in a graphite crucible resistance furnace. Al-manganese alloy, aluminum-zirconium alloy, aluminum-vanadium alloy and pure aluminum are charged at room temperature at the same time; aluminum-copper alloy is added at 720°C; aluminum-titanium-boron alloy is added at 740°C and stirred for 3 minutes. Refining and degassing with commercial solid refining agent at 730-740°C, standing for 8 minutes, removing slag, adding a small amount of covering agent, adding pure magnesium and aluminum rare eart...

Embodiment 2

[0032] Step 1: Ingredients

[0033] Composition Specification Mass percentage dosage

[0034] Pure aluminum ingot Al99.8 72.5%

[0035] Aluminum copper alloy 50% Cu 8%

[0036] Aluminum manganese alloy 10% Mn 8%

[0037] Pure magnesium ingot 2.0%

[0038] Aluminum-zirconium alloy 10% Zr 2%

[0039] Aluminum vanadium alloy 4%V 5%

[0040] Aluminum titanium boron alloy 5% Ti, 1% B 1%

[0041] Aluminum rare earth alloy 10% RE 1.5%

[0042] Step 2: Melting, Step 3: Squeeze Casting, Step 4: Heat Treatment

[0043] Same as Embodiment 1.

[0044] In addition to aluminum, the alloy material obtained through the above steps also contains copper 4.0wt%, magnesium 2.0wt%, manganese 0.8wt%, titanium 0.05wt%, boron 0.01wt%, vanadium 0.2wt%, zirconium 0.2wt%, Iron 0.12wt%, silicon 0.05wt%. The mechanical properties of the alloy materials under different specific pressures are shown in Table 2.

[0045] Extrusion specific pressure

Embodiment 3

[0047] Step 1: Ingredients

[0048] Composition Specification Mass percentage dosage

[0049] Pure aluminum ingot Al99.8 77.75%

[0050] Aluminum copper alloy 50% Cu 10%

[0051] Aluminum manganese alloy 10% Mn 4%

[0052] Pure magnesium ingot 1.0%

[0053] Aluminum-zirconium alloy 10% Zr 0.5%

[0054] Aluminum vanadium alloy 4% V 1.25%

[0055] Aluminum titanium boron alloy 5% Ti, 1% B 5%

[0056]Aluminum rare earth alloy 10% RE 0.5%

[0057] Step 2: Melting, Step 3: Squeeze Casting, Step 4: Heat Treatment

[0058] Same as Embodiment 1.

[0059] In addition to aluminum, the alloy material obtained through the above steps also contains 5.0wt% copper, 1.0wt% magnesium, 0.4wt% manganese, 0.25wt% titanium, 0.05wt% boron, 0.05wt% vanadium, 0.05wt% zirconium, iron 0.18wt%, silicon 0.08wt%. The mechanical properties of the alloy materials under different specific pressures are shown in Table 3.

[0060] Extrusion specific pressure

[0061] tensile stren...

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Abstract

The present invention relates to aluminum alloy material, and is especially one kind of directly extrusion cast high strength aluminum alloy. The aluminum alloy consists of Cu 4.0-5.0 wt%, Mg 1.0-2.0 wt%, Mn 0.4-0.8 wt%, trace alloy elements including Ti 0.05-0.25 wt%, B 0.01-0.05 wt%, V 0.05-0.20 wt% and Zr 0.05-0.20 wt%, and mixed RE 0.05-0.15 wt% except Al and inevitable impurities, including Fe less than 0.2 wt% and Si less than 0.1 wt%. The aluminum alloy is prepared through direct extrusion casting, quenching and perfect artificially ageing process, has the features of capacity of being heat treated to reinforce, high strength, low cost, etc, and is suitable for use in making heavy bearing aluminum alloy structures.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a high-strength aluminum alloy directly extruded and cast. Background technique [0002] As a traditional metal material, cast aluminum alloy has the characteristics of low density and high specific strength, and has been widely used in aviation, aerospace, automobile, machinery and other industries. With the rapid development of modern industry and the continuous improvement of economic level, in In many occasions, the performance requirements of cast aluminum alloys are getting higher and higher. Among them, the development of high-strength cast aluminum alloy is a very important aspect. Therefore, both at home and abroad have been committed to developing low-cost, high-strength cast aluminum alloys by optimizing alloy design and improving casting processes. [0003] Squeeze casting is a forming process between casting and forging, which has the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12B22D17/00
Inventor 李元元张明张卫文赵海东陈维平罗宗强李彦霞
Owner SOUTH CHINA UNIV OF TECH
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