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A kind of high-strength stress corrosion-resistant al-zn-mg-cu alloy and preparation method thereof

A technology of stress corrosion resistance and alloy is applied in the field of high-strength stress corrosion resistance Al-Zn-Mg-Cu alloy for rail transit and its preparation field, which can solve the problems of poor stress corrosion resistance and achieve improved service life, good mechanical properties and Stress corrosion resistance, effect of uniform grain size

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The peak aging (T6) heat treatment process can generally obtain the highest static strength aluminum-zinc-magnesium (copper) alloy, while the overaging (T74) heat treatment process can generally obtain aluminum-zinc-magnesium (copper) alloys with medium strength and better stress corrosion resistance. Although the newly developed regression reaging (RRA) and non-isothermal aging improve the static strength of the alloy, the stress corrosion resistance is not as good as the T74 heat treatment system

Method used

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  • A kind of high-strength stress corrosion-resistant al-zn-mg-cu alloy and preparation method thereof
  • A kind of high-strength stress corrosion-resistant al-zn-mg-cu alloy and preparation method thereof
  • A kind of high-strength stress corrosion-resistant al-zn-mg-cu alloy and preparation method thereof

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Embodiment 1

[0033] A certain alloy composition (mass percentage) is as follows: Zn content is 4.5%, Mg content is 1.5%, Mn content is 0.35%, Cu content is 0.12%, Cr content is 0.15%, Zr content is 0.2%, Ti content is 0.05%, The balance is aluminum and the alloy has a Zn / Mg ratio of 3. After the alloy is homogenized at 220°C / 5h, 330°C / 20h, and 450°C / 12h, the alloy is extruded and deformed. Before extrusion, the alloy is subjected to heat preservation treatment at 450°C. The ratio is 17%, the strain rate is 3.00s -1, after extrusion deformation, the alloy was subjected to two-stage solution treatment at 430°C / 0.5h and 475°C / 1.5h. After solid solution treatment, the alloy is quenched, the quenching medium is water, and the quenching temperature is 15°C, and then the alloy is quickly transferred to a constant temperature aging furnace for low-temperature pre-aging treatment at 60°C / 24h, 95°C / 24h and 150°C / 24h three-stage aging treatment. After treatment, the tensile strength of the alloy ...

Embodiment 2

[0037] A certain alloy composition (mass percentage) is as follows: Zn content is 5%, Mg content is 2%, Mn content is 0.25%, Cu content is 0.2%, Cr content is 0.12%, Zr content is 0.18%, Ti content is 0.1%, The balance is aluminum and the alloy has a Zn / Mg ratio of 2.5. The alloy has been homogenized at 250°C / 5h, 360°C / 20h, and 475°C / 12h. After the homogenization treatment, the alloy is extruded and deformed. Before extrusion, the alloy is subjected to heat preservation treatment at 460°C. The extrusion temperature is 350°C, the extrusion ratio is 17%, and the strain rate is 4.00s. -1 , after extrusion deformation, the alloy was subjected to two-stage solution treatment at 430°C / 0.5h and 475°C / 1.5h. After solution treatment, the alloy is quenched, the quenching medium is water, and the quenching temperature is 20°C, and then the alloy is quickly transferred to a constant temperature aging furnace for low-temperature pre-aging treatment at 65°C / 24h, 100°C / 24h and 150°C / 24h t...

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Abstract

The invention discloses an Al-Zn-Mg-Cu alloy with high strength and stress corrosion resistance and a preparation method of the Al-Zn-Mg-Cu alloy. The Al-Zn-Mg-Cu alloy contains elements in percentageby mass as follows: 3.5%-5.5% of Zn, 1.5%-2.2% of Mg, 0.4%-0.8% of Mn and 0.1%-0.3% of Cu, and a ratio of Zn / Mg is 2.5-3.0. With the adoption of a gravity casting technology, an as-cast alloy is subjected to three-stage homogenizing treatment and deformation treatment, and finally, the alloy is subjected to two-stage solution treatment and three-stage aging treatment. The alloy strength, the ductility and the stress corrosion resistance of the Al-Zn-Mg-Cu alloy are all higher than those of Al-Zn-Mg-Cu alloy used for rail traffic currently. The Al-Zn-Mg-Cu alloy is applicable to the field of the rail traffic, the service life of the aluminum alloy for the rail traffic and transportation is greatly prolonged, besides, the forming and heat treatment processes are simple, and the Al-Zn-Mg-Cualloy is suitable for large-scale production and manufacture.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and relates to a high-strength stress-corrosion-resistant Al-Zn-Mg-Cu alloy for rail transit and a preparation method thereof. Background technique [0002] Aluminum alloy is widely used in transportation, building materials, aerospace and navigation because of its low density, excellent corrosion resistance and cold and hot processing performance. By adding different alloy elements and different heat treatment methods, aluminum alloys with different application directions can be obtained. [0003] The development of the Internet of Things and transportation requires lightweight and environmentally friendly materials as processing carriers. After aging treatment, Al-Zn-Mg alloys have high-density GP regions and η′ strengthening phases in the grains and grain boundaries, so they have excellent mechanical properties and deformation properties, and are widely used in the fields of rail tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/002C22F1/053
Inventor 罗兵辉王帅郑亚亚姜根
Owner CENT SOUTH UNIV
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