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Extrusion casted Al-Zn alloy material with high toughness

A technology of squeeze casting and alloy materials, applied in the field of aluminum alloy materials, to achieve the effects of good casting formability, good plasticity and flow properties, and high strength

Inactive Publication Date: 2014-06-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the shortcomings of existing squeeze casting aluminum alloys, and develop a high-strength and tough squeeze casting Al-Zn system with excellent comprehensive mechanical properties and good casting formability by optimizing the alloy composition design and using the squeeze casting process. alloy

Method used

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  • Extrusion casted Al-Zn alloy material with high toughness
  • Extrusion casted Al-Zn alloy material with high toughness
  • Extrusion casted Al-Zn alloy material with high toughness

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] The extrusion casting Al-Zn series alloy material of the present invention adopts extrusion casting technology, and adopts solid solution treatment+artificial aging technology to prepare, and steps and technology thereof are as follows:

[0021] Step 1: Ingredients

[0022]

[0023]

[0024] Step 2: Smelting

[0025] The alloy is smelted in a graphite crucible. Preheat the crucible to dark red before smelting. Add pure aluminum, Al-50Cu intermediate alloy, aluminum-zirconium alloy when the furnace temperature is 300-400°C, and add pure magnesium and pure zinc when the furnace temperature is 700°C. , Add aluminum-titanium-boron alloy and aluminum-rare-earth alloy at 720°C. After it is completely melted, refine and degas it, let it stand for a few minutes to remove slag, stir well and pour at 720°C.

[0026] Step Three: Squeeze Casting

[0027] Squeeze casting press is 100 tons four-column hydraulic press, which is carried out on the direct extrusion casting mold....

Embodiment 2

[0034] The extrusion casting Al-Zn series alloy material of the present invention adopts extrusion casting technology, and adopts solid solution treatment+artificial aging technology to prepare, and steps and technology thereof are as follows:

[0035] Step 1: Ingredients

[0036]

[0037]

[0038] Step 2: Melting, Step 3: Squeeze Casting, Step 4: Heat Treatment

[0039] Same as Embodiment 1.

[0040] The squeeze casting Al-Zn alloy material obtained through the above steps has been tested for its main components and their mass percentages: alloy material zinc 7.00%, magnesium 2.80%, copper 2.00%, titanium 0.15%, boron 0.03%, zirconium 0.15%, mixed rare earth 0.10%, the rest is aluminum and unavoidable impurities, of which iron is 0.20%, silicon is 0.10%. The mechanical properties of the alloy material in this example under different specific pressures are shown in Table 2.

[0041] Table 2 Mechanical properties of alloys under different extrusion ratios

[0042] ...

Embodiment 3

[0044] Step 1: Ingredients

[0045]

[0046] Step 2: Melting, Step 3: Squeeze Casting, Step 4: Heat Treatment

[0047] Same as Embodiment 1.

[0048] The extrusion casting Al-Zn alloy material obtained through the above steps has been tested for its main components and mass percentages: 7.30% zinc, 2.90% magnesium, 1.90% copper, 0.20% titanium, 0.04% boron, and 0.20% zirconium , mixed rare earth 0.15%, the rest is aluminum and unavoidable impurities, of which iron is 0.20%, silicon is 0.10%. The mechanical properties of the alloy material in this example under different specific pressures are shown in Table 3.

[0049] Table 3 Mechanical properties of alloys under different extrusion ratios

[0050] Extrusion specific pressure

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Abstract

The invention provides an extrusion casted aluminum-zinc-magnesium-copper alloy material with high toughness. The alloy material is a high-toughness extrusion casted Al-Zn alloy material obtained by using an extrusion casting technology at an extrusion specific pressure of 25-75 Mpa and using solution treatment and an artificial aging process; the alloy material comprises the main components in percentage by mass: 6.50-7.50 % of zinc, 2.00-3.00 % of magnesium, 1.80-2.20 % of copper, 0.22-0.60 % of trace alloy enhancing elements and the balance of aluminum and inevitable impurities. The alloy material provided by the invention has the advantages of reasonable component design, excellent comprehensive mechanical property, good cast forming performance and lower cost, can be used for manufacturing parts with lightweight and weight reduction requirements, such as airplane wings, knuckles, connecting bars and other structural pieces, and has broad application prospect in the fields like automobile, transportation, aviation, aerospace and the like.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a high-strength and tough extrusion-cast Al-Zn alloy material with excellent mechanical properties. Background technique [0002] In recent years, with the rapid development of my country's economy, the automobile industry, rail transit, aviation, aerospace and other industries have put forward higher requirements for lightweight and high-performance equipment. Therefore, as an important material to realize the lightweight development of parts, aluminum alloy has a wider range of applications and higher performance requirements. Among them, the application of cast aluminum alloy has attracted much attention. [0003] Optimizing alloy composition and selecting a suitable forming process is an important way to improve the performance of aluminum alloy materials. At present, in the research and development of high-strength and toughness cast aluminum alloy materials, Al-Cu series cast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10
Inventor 张卫文张大童赵海东罗江勇李元元
Owner SOUTH CHINA UNIV OF TECH
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