Preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy

A high-strength, high-toughness, aluminum alloy technology, applied in the field of metal and alloy preparation, can solve the problems of low strength and toughness, low manufacturing cost, etc., and achieve the effects of low cost, high strength and high efficiency

Inactive Publication Date: 2016-02-17
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problem of low strength and toughness of existing Al-Mg-Si-(Cu) aluminum alloys, to provide high-strength and high-toughness ultra-fine-grained Al-Mg-Si-(Cu) A new preparation method of aluminum alloy, through the combination of appropriate heat treatment and ECP dynamic aging at different temperatures, refines the grains of Al-Mg-Si-(Cu) aluminum alloy, and controls the precipitation phase β of nanoscale aging" The number, shape and distribution of the alloy and its interaction with dislocations, so that the strength of the alloy is greatly improved, and at the same time it has good plasticity and toughness, which expands the application range of Al-Mg-Si-(Cu) aluminum alloys. Not only can it be used for large-scale production of high-strength and high-toughness aluminum alloys, but it also has lower manufacturing costs than existing preparation methods

Method used

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  • Preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy
  • Preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy
  • Preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy

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Effect test

Embodiment 1

[0059] The AA6061 aluminum alloy is cast into a round billet with a diameter of 130mm, processed into a profile with a size of 100×100×350mm by turning, and the profile is homogenized at 520°C×24h in a circulating air resistance furnace , the homogenized profile is subjected to solution treatment and water quenching at 560°C×2h in a circulating air resistance furnace, and then the profile after solution quenching is subjected to equal channel angular extrusion dynamic aging within 20 minutes, etc. The temperature for dynamic aging of channel angular extrusion is room temperature. The process of equal channel angular extrusion is as follows: the inner intersection angle of two channels Φ=90°, the circumscribed arc angle Ψ=20.6°, 4 passes of extrusion, between each pass The profile is rotated 90° clockwise along the axis, and the extrusion speed is 5mm s -1 , followed by ECP dynamic aging at room temperature for average grain size determination and tensile testing.

[0060] The...

Embodiment 2

[0062]The AA6061 aluminum alloy is cast into a round billet with a diameter of 130mm, processed into a profile with a size of 100×100×350mm by turning, and the profile is homogenized at 520°C×24h in a circulating air resistance furnace , the homogenized profile is subjected to solution treatment and water quenching at 560°C×2h in a circulating air resistance furnace, and then the profile after solution quenching is subjected to equal channel angular extrusion dynamic aging within 20 minutes, etc. The temperature for dynamic aging of channel angular extrusion is 110°C, and the process of equal channel angular extrusion is: the inner intersection angle of two channels Φ=90°, the outer arc angle Ψ=20.6°, 4 passes of extrusion, each pass Rotate the profile 90° clockwise along the axial direction, and the extrusion speed is 5mm·s -1 , followed by average grain size determination and tensile testing of the aluminum alloys dynamically aged by ECP at 110 °C.

[0063] The test results...

Embodiment 3

[0065] The AA6061 aluminum alloy is cast into a round billet with a diameter of 130mm, processed into a profile with a size of 100×100×350mm by turning, and the profile is homogenized at 520°C×24h in a circulating air resistance furnace , the homogenized profile is subjected to solution treatment and water quenching at 560°C×2h in a circulating air resistance furnace, and then the profile after solution quenching is subjected to equal channel angular extrusion dynamic aging within 20 minutes, etc. The dynamic aging temperature of the channel angular extrusion is 190°C. The process of the equal channel angular extrusion is: the inner intersection angle of the two channels Φ=90°, the circumscribed arc angle Ψ=20.6°, 4 passes of extrusion, each pass Rotate the profile 90° clockwise along the axial direction, and the extrusion speed is 5mm·s -1 , followed by average grain size determination and tensile testing of the aluminum alloys dynamically aged by ECP at 190°C.

[0066] The ...

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Abstract

The invention belongs to the technical field of preparation of metal and alloy, and provides a preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy. The preparation method comprises the steps that aluminium alloy is firstly cast to form a cast-state blank; then the cast-state blank is turned into an ECAP (Equal Channel Angular Pressing) blank, and then the ECAP blank is subjected to homogenization treatment and curing quenching treatment; and then the blank subjected to the curing quenching treatment is subjected to 1-8 passes of ECAP dynamic ageing treatment at temperatures ranging from the room temperature to 300 DEG C. According to the preparation method, through the ECAP dynamic ageing treatment at different temperatures, the grain size of the alloy is obviously refined; and the form and distribution of a nanometer ageing precipitated phase are more reasonable, so that the strength of the alloy is greatly improved, and meanwhile the alloy has excellent ductility and toughness.

Description

technical field [0001] The invention belongs to the technical field of metal and alloy preparation, and relates to a preparation method of high-strength and high-toughness ultra-fine grain Al-Mg-Si-(Cu) aluminum alloy. Background technique [0002] 6000 series Al-Mg-Si-(Cu) aluminum alloy is the most widely used heat treatable aluminum alloy in modern industry. This type of alloy has good formability, good welding performance and corrosion resistance, and can be strengthened quickly. It is widely used in Aerospace, ships, transportation, architectural decoration, container packaging, machinery manufacturing, electric power industry and other fields; but with the rapid development of industry, the strength and The mechanical properties such as plasticity and toughness can no longer meet the practical application, and there is an urgent need to improve the comprehensive mechanical properties of the alloy. For example, the most widely used aluminum alloys such as 6061 and 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C21/02C22F1/05
Inventor 刘满平程晓农刘强张振亚孙少纯焦雷
Owner JIANGSU UNIV
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