Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and preparation method thereof

An ultra-high-strength, aluminum alloy technology, applied in the field of ultra-high-strength aluminum alloy materials, Al-Zn-Mg-Cu series ultra-high-strength aluminum alloys and its preparation, can solve the difficulties in preparing three-dimensional large-size materials, increase production costs, and process flow Complicated and other issues, to achieve the effect of high controllability of product components, low production cost, and obvious strengthening effect

Inactive Publication Date: 2019-09-17
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The rapid solidification technology of the single-roller melt rotation method can prepare fine-grained thin strips because the cooling rate of the melt is greatly increased, but it is difficult to prepare three-dimensional large-size materials, which limits the application of this technology in structural materials
[0005] At present, there are some technical researches on rapid solidification + hot extrusion, but most of them focus on powder metallurgy heating extrusion, and the aluminum alloy powder prepared by aerosol method is generally cumbersome and costly.
In the patent CN201010298603.6, the method of preparing nanocrystalline aluminum alloy by rapid solidification, strip milling, ball milling, vacuum sheathing, and hot extrusion is not mentioned, but the information on the performance of the prepared aluminum alloy is not mentioned, and The technological process is relatively complicated; the patent CN201310051011.8 involves the technical application of powder metallurgy heating and extrusion. Cost, the strength of the prepared material is less than 500MPa

Method used

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  • Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and preparation method thereof
  • Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and preparation method thereof
  • Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An Al-Zn-Mg-Cu series ultra-high-strength aluminum alloy has the following specific components in terms of mass percentage: 10.72% Zn, 2.43% Mg, 0.86% Cu, and the balance is Al.

[0035] (1) Heating industrial pure aluminum (purity ≥ 99.7%) to 750°C to 800°C in a crucible resistance furnace;

[0036] (2) After the industrial pure aluminum is completely melted, stir and let stand for 5 minutes, then add copper (purity 99.9% to 99.95%), industrial pure zinc (purity ≥ 99.7%) and industrial pure magnesium (purity ≥ 99.7%) in sequence ; During the addition process, until the previous raw material is completely melted, stir and let it stand for 5-10 minutes, then add the next raw material until all the raw materials are completely melted;

[0037] (3) When the temperature of the molten metal drops to 710°C-720°C, it is sprayed onto a high-speed rotating copper roller to obtain a strip with a rapid solidification structure, the width of the strip is 2.9-3.3mm, and the thicknes...

Embodiment 2

[0045] The main steps of this embodiment are the same as those in Embodiment 1, and the similarities will not be described in detail. The difference is that:

[0046] Utilize the cold-pressed billet prepared in embodiment 1, adopt the method for hot positive extrusion, obtain the solid bar that diameter is 8mm, concrete preparation method is as follows:

[0047] (1) First put the cold-pressed billet prepared in Example 1 into a box-type resistance furnace for heating and heat preservation, the heating temperature is 420° C., and the heat preservation time is 0.5 h; the extrusion nozzle is put into a box-type resistance furnace for heating and heat preservation, and the The temperature is 400°C, and the holding time is more than 0.5h; the extrusion mold is heated and held at 400°C, and the holding time is more than 2h;

[0048] (2) After the heat preservation is completed, hot extrusion is carried out, the extrusion ratio is 39.1, and the cooling method is water quenching; then...

Embodiment 3

[0051] The main steps of this example are the same as those of Example 1, and the similarities will not be described again. The difference is that the cold-pressed billet prepared in Example 1 is used to obtain a solid rod with a diameter of 8 mm by using the method of hot forward extrusion. material, the specific preparation method is as follows:

[0052] (1) First put the cold-pressed billet prepared in Example 1 into a box-type resistance furnace for heating and heat preservation, the heating temperature is 420° C., and the heat preservation time is 0.5 h; the extrusion nozzle is put into a box-type resistance furnace for heating and heat preservation, and the The temperature is 400°C, and the holding time is more than 0.5h; the extrusion mold is heated and held at 400°C, and the holding time is more than 2h;

[0053] (2) After the heat preservation is completed, hot extrusion is carried out, the extrusion ratio is 39.1, and the cooling method is water quenching; then the s...

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Abstract

The invention relates to an Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy which is prepared from the following components in percentage by mass: 10-12 percent of Zn, 2-3 percent of Mg, 0.5-1.5 percent of Cu, smaller than 0.2 percent of a total amount of Fe and Si, smaller than 0.2 percent of impurity and the balance of Al. A preparation method for the Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy comprises the following steps of step 1, adding industrial pure aluminum in a crucible resistance furnace for heating and complete melting according to the mass percentage, and then sequentially adding a Cu source, a Zn source and an Mg source until all the materials are thoroughly molten; step 2, performing stirring, refining with degassing and slag skimming; step 3, spraying a prepared metal liquid to a copper roller to prepare a strip; step 4, performing cold isostatic pressing on the strip obtained through rapid solidification to obtain a cold-pressed blank; step 5, performing hot extrusion on the cold-pressed blank to obtain an extruded rod; and step 6, finally, performing heat treatment on the extruded rod. By adopting the technical method provided by the invention, the process flow is simplified, the material utilization rate is high, and the Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy has high strength and shaping and has a good application prospect in the fields of aerospace, automobiles and the like.

Description

technical field [0001] The invention belongs to the field of nonferrous metals, and relates to an ultrahigh-strength aluminum alloy material, in particular to an Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and a preparation method thereof. Background technique [0002] Al-Zn-Mg-Cu ultra-high-strength aluminum alloy is a kind of high-performance aluminum alloy developed under the background of aerospace materials. It has the excellent characteristics of light weight, high strength, high toughness and easy processing. With the rapid development of the modern aerospace industry, higher requirements are placed on the comprehensive performance of ultra-high-strength aluminum alloys. At the same time, the development of the modern nuclear industry and the transportation industry also urgently require high-performance, lightweight structural materials. Therefore, it is of great significance to explore and prepare ultra-high-strength aluminum alloys that meet the needs of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
CPCC22C1/026C22C21/10C22F1/053
Inventor 张大童甘吉松梁光兴陈俊杰孟显娜
Owner SOUTH CHINA UNIV OF TECH
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