Ultrahigh-strength and heat-resistant aluminum alloy and preparation method thereof

An aluminum alloy, ultra-high-strength technology, applied in the field of aluminum alloys, to achieve the effects of inhibiting precipitation and growth, improving high temperature resistance, and improving microstructure and performance stability

Active Publication Date: 2019-06-18
郑州轻研合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of existing heat-resistant aluminum alloys, the present invention provides an ultra-high-strength heat-resistant aluminum alloy and a preparation method thereof. Through multiple means such as microalloying, deformation, and heat treatment, the precipitation and distribution of strengthening phases in the alloy are controlled, and the strength of the alloy is improved. Reinforced phase density, so that the alloy still has a large number of finely dispersed strengthened phases at high temperatures, improving the strength and heat resistance of the alloy

Method used

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  • Ultrahigh-strength and heat-resistant aluminum alloy and preparation method thereof
  • Ultrahigh-strength and heat-resistant aluminum alloy and preparation method thereof
  • Ultrahigh-strength and heat-resistant aluminum alloy and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] An ultra-high-strength heat-resistant aluminum alloy, composed of the following components in mass percentage: Cu: 6.8%, Ag: 1.2%, Mg: 0.8%, Cr: 0.3%, Mo: 0.3%, Zr: 0.12%, Sc: 0.12%, the rest is Al and unavoidable impurity elements; among them, the mass ratio of copper to magnesium is controlled to be 8.5.

[0025] The preparation method of the above-mentioned ultra-high-strength heat-resistant aluminum alloy comprises the following steps:

[0026] (1) The ingredients are prepared according to the mass percentage of each component in the alloy, among which Cu, Ag, Mg are added in the form of pure metal, and other components are added in the form of aluminum-based master alloy; the raw materials are smelted in a vacuum intermediate frequency induction melting furnace. The process is first vacuumed, then filled with 3000Pa argon for protection, stirred and left to stand after complete melting, and cast into metal molds to obtain ingots; in steps (1) of Examples 1 to 4, al...

Embodiment 2

[0034] An ultra-high-strength heat-resistant aluminum alloy consisting of the following components in mass percentage: Cu: 6.3%, Ag: 1.0%, Mg: 0.9%, Cr: 0.1%, Mo: 0.3%, Zr: 0.16%, Sc: 0.09%, Y: 0.09%, and the rest are Al and unavoidable impurity elements; among them, the mass ratio of copper to magnesium is controlled at 9.

[0035] The preparation method of the above-mentioned ultra-high-strength heat-resistant aluminum alloy comprises the following steps:

[0036] (1) Dosing according to the mass percentage of each component in the alloy, put it in a vacuum medium frequency induction melting furnace for melting, vacuumize first, then fill with 3000Pa argon for protection, stir and stand still after melting completely, and cast into a metal mold to obtain an ingot;

[0037] (2) The ingot obtained in step (1) is subjected to two-stage homogenization treatment: 420°C / 12h+515°C / 18h, and the cooling method is to cool to room temperature with the furnace;

[0038](3) Hot-rolling...

Embodiment 3

[0043] An ultra-high-strength heat-resistant aluminum alloy, composed of the following components in mass percentage: Cu: 7.2%, Ag: 1.5%, Mg: 0.8%, Cr: 0.1%, Mo: 0.5%, Zr: 0.25%, Sc: 0.09%, Er: 0.09%, Y: 0.09%, and the rest are Al and unavoidable impurity elements; among them, the mass ratio of copper to magnesium is controlled at 9.

[0044] The preparation method of the above-mentioned ultra-high-strength heat-resistant aluminum alloy comprises the following steps:

[0045] (1) Dosing according to the mass percentage of each component in the alloy, put it in a vacuum medium frequency induction melting furnace for melting, vacuumize first, then fill with 3000Pa argon for protection, stir and stand still after melting completely, and cast into a metal mold to obtain an ingot;

[0046] (2) The ingot obtained in step (1) is subjected to two-stage homogenization treatment: 420°C / 10h+515°C / 16h, and the cooling method is to cool to room temperature with the furnace;

[0047] (3) ...

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Abstract

The invention provides an ultrahigh-strength and heat-resistant aluminum alloy and a preparation method, and the alloy aims at overcoming the defects of an existing heat-resistant aluminum alloy. Theultrahigh-strength and heat-resistant aluminum alloy comprises the following components in percentage by mass: 5.9-7.2% of copper, 0.60-1.50% of silver, 0.6-0.9% of magnesium, 0.1-0.5% of chromium, 0.1-0.5% of molybdenum, 0.09-0.3% of zirconium, 0.07-0.12% of scandium and/or 0.07-0.12% of erbium and/ or 0.07-0.12% of yttrium, and the balance aluminum, wherein the mass ratio of copper to magnesiumis 7-10. According to the ultrahigh-strength and heat-resistant aluminum alloy, the separating out of a strengthening phase in the alloy and the distribution are controlled by means of microalloying,deforming, thermal treatment and the like based on the abovementioned mixing ratio of the alloy, so that the density of the strengthening phase in the alloy is improved, and the alloy remains a largeamount of fine dispersed strengthening phases under high temperature, and as a result, the alloy strength and heat resistance are improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to an ultrahigh-strength heat-resistant aluminum alloy and a preparation method thereof. Background technique [0002] Today, with the rapid development of science and technology, aircraft are developing in the direction of ultra-high speed, stealth, and intelligence, and higher and higher requirements are placed on aviation materials. For example, supersonic aircraft, whose speed reaches the speed of sound, the skin material of the aircraft is in a state of intense friction with the air for a long time, and it is in a state of high temperature service. When the speed reaches M2.5, the temperature of the skin material exceeds 150°C. This temperature has reached the limit of use of the current aluminum alloy skin material, and safety cannot be guaranteed. Although titanium alloys and carbon fiber composites can be used for a long time under high temperature condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C1/02C22F1/057C21D9/00
Inventor 刘志鹏肖阳刘金学马凯杰程家尧王松森王军武解海涛
Owner 郑州轻研合金科技有限公司
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