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Method for preparing high-strength and high-toughness aluminum alloy sheet by stack rolling

A technology of aluminum alloy plate and aluminum alloy plate, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve problems such as difficulty in preparing large-scale gradient materials, limited equipment, and poor plasticity of high-strength metals

Active Publication Date: 2021-04-06
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-strength metals tend to have poor plasticity, while metals with good plasticity have low strength
However, it has been found through research that gradient materials can have both properties very well, and still have good toughness while obtaining high strength; however, the previous methods of making gradient materials are often limited by equipment and other problems, and it is difficult to prepare large-scale gradient materials. ; Therefore, how to realize the preparation of gradient materials under the existing conditions is one of the key issues of research

Method used

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  • Method for preparing high-strength and high-toughness aluminum alloy sheet by stack rolling
  • Method for preparing high-strength and high-toughness aluminum alloy sheet by stack rolling
  • Method for preparing high-strength and high-toughness aluminum alloy sheet by stack rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The aluminum alloy plate with a thickness of 3mm (length × width = 300mm × 150mm) was subjected to single-pass cold rolling, and the total deformation rate was 50%, 75% and 87.5%, respectively, and the thickness was 1.5mm, 0.75mm and 0.375mm. Cold-rolled sheet, referred to as the first cold-rolled sheet, the second cold-rolled sheet and the third cold-rolled sheet;

[0043] Cut the 1st to 3rd cold-rolled sheets into 3 kinds of cold-rolled cut sheets with length×width=300mm×150mm;

[0044] Annealing the 3 kinds of cut sheets respectively to make 3 kinds of annealed sheets; annealing temperature 480±10℃, time 10min;

[0045] Surface-treated each annealed sheet to obtain 3 kinds of surface-treated annealed sheets; they are respectively referred to as the first surface-treated annealed sheet, the second surface-treated annealed sheet and the third surface-treated annealed sheet in order of thickness;

[0046] The three kinds of surface-treated annealed sheets are stacked i...

Embodiment 2

[0051]The method is the same as in Example 1, except that:

[0052] (1) The stacking method of the composite billet is to stack the first surface-treated annealed sheet, the second surface-treated annealed sheet and the third surface-treated annealed sheet in sequence to form a composite billet with a total thickness of 2.625mm; the first surface-treated annealed sheet is located. side as the connection side;

[0053] (2) During warm rolling, the roll speed is 200 r / min, and the total reduction rate of warm rolling is 96.84% to make a laminated sheet; the side where the first surface-treated annealed sheet is located is used as the connecting side;

[0054] (3) The connecting sides of two identical laminated sheets are butt-stacked to form a composite laminated sheet;

[0055] (4) The composite laminated sheet is preheated under the condition of 200±10℃ for 10 minutes, and then the secondary warm rolling is carried out. Laminated sheets; secondary warm rolling is a single pa...

Embodiment 3

[0058] The method is the same as in Example 2, except that:

[0059] (1) During warm rolling, the roll speed is 400r / min, and the total reduction rate of warm rolling is 97.25%, and the laminated sheet is made;

[0060] (2) The roll speed of the secondary warm rolling is 400r / min, and the total reduction rate of the secondary warm rolling is 52.3%;

[0061] (3) Heat treatment of the secondary laminated sheet at 480±10°C for 8s to obtain a high-strength and high-toughness aluminum alloy sheet with a tensile strength of 351MPa and an elongation of 18.2%.

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Abstract

A method for preparing high-strength and high-toughness aluminum alloy plates by stack rolling, which is carried out according to the following steps: (1) performing single-pass cold rolling on the aluminum alloy plates to make cold-rolled plates of different thicknesses respectively; (2) each cold-rolled plate The rolled plates are cut separately; (3) Annealed separately; (4) Surface treated; (5) The annealed plates with n types of surface treatment are stacked in a gradient manner to form a combined billet, and the thickness distribution in the combined billet is a bidirectional gradient distribution or a unidirectional Gradient distribution; (6) Preheat at 200±10°C after bundling and fixing, and then warm rolling; (7) When the combined billet is distributed in a unidirectional gradient, stack and bundle two stacked rolling plates, and preheat at 200±10°C , and then second warm rolling; (8) Heat treatment at 480±10°C. In the present invention, aluminum alloy plates of different thicknesses are combined and arranged in gradients through a stack rolling method, forming a gradient arrangement of small crystal grains along the thickness direction, and obtaining a high-strength and high-toughness aluminum alloy plate with a gradient structure.

Description

technical field [0001] The invention relates to the technical field of metal composite material preparation, in particular to a method for preparing a high-strength and high-toughness aluminum alloy plate by stacking. Background technique [0002] The general methods of making high-strength aluminum alloys, such as equal channel angular extrusion (ECAP), high pressure torsion (HPT), multi-directional forging (MF), and accumulative rolling (ARB), are all severe deformation techniques. The ultrafine grained material is taken to obtain high strength, but the toughness of the ultrafine grained material obtained by these methods is often not very good. [0003] The strength and toughness and plasticity of metal materials are usually not compatible. High-strength metals tend to have poor plasticity, while metals with good plasticity tend to be low-strength. However, it has been found that gradient materials can have both properties well, and they can obtain high strength while s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/38B21B47/00C22F1/04
CPCB21B1/38B21B47/00B21B2001/386C22F1/04
Inventor 祖国庆王宇帆高原陆昱宽陈闯
Owner CHANGCHUN UNIV OF TECH