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Preparation method of ultra-high strength and toughness aluminum alloy sheet with large width-to-thickness ratio

An aluminum alloy plate, ultra-high strength and toughness technology, applied in the field of metal plate preparation, can solve the problems of reducing material utilization, coarseness, uneven metal flow, etc., to improve material utilization, refine microstructure, and increase flow process Effect

Active Publication Date: 2016-08-24
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sheet is formed by the conventional extrusion process, on the one hand, with the increase of the width-thickness ratio of the extruded sheet, under the action of friction, the metal flow in the core of the original alloy ingot is faster and the metal flow is uneven, resulting in extrusion forming. The microstructure of the central part of the plate is coarser than that of the edge part
On the other hand, because the conventional extrusion process cannot eliminate extrusion tailing, delamination occurs inside the formed sheet, which affects the mechanical properties of the sheet and reduces the material utilization rate

Method used

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  • Preparation method of ultra-high strength and toughness aluminum alloy sheet with large width-to-thickness ratio
  • Preparation method of ultra-high strength and toughness aluminum alloy sheet with large width-to-thickness ratio
  • Preparation method of ultra-high strength and toughness aluminum alloy sheet with large width-to-thickness ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Material preparation

[0027] 7000 series aluminum alloy composition: Zn11.0%, Mg2.0%, Cu1.0%, Ni0.10%, impurity≤0.15%, the rest Al.

[0028] The deposition ingot is prepared by spray deposition process, the deposition ingot is Ф120mm, and the height is 400mm.

[0029] (2) Machining of deposited round ingots

[0030] The surface of the deposition ingot is mechanically peeled off and both ends of the deposition ingot are flattened. The processed blank is Ф100mm and the height is 300mm.

[0031] (3) Deposition round ingot heating

[0032] The deposition round ingot processed in step (2) is heated at a temperature ranging from 370° C., and then kept at the temperature for 2 hours.

[0033] (4) Asymmetric extrusion die assembly

[0034] Asymmetric extrusion dies such as figure 1 As shown, it includes an extrusion punch 1, an extrusion die 2, an ingot cylinder 3, and a first pad 4, a second pad 5 and a third pad 6 arranged in the cavity of the extrusion die 2 An a...

Embodiment 2

[0045] (1) Material preparation

[0046]7000 series aluminum alloy composition: Zn12.0%, Mg2.2%, Cu1.3%, Ni0.15%, impurity ≤0.15%, the rest Al. The deposition ingot is prepared by spray deposition process, the diameter of the deposition ingot is Ф240mm, and the height is 600mm.

[0047] (2) Machining of deposited round ingots

[0048] The surface of the deposited ingot is mechanically peeled and the end face of the ingot is flattened, and it is enough to see the light. The processed blank is Ф220mm and the height is 550mm.

[0049] (3) Deposition round ingot heating

[0050] The deposition round ingot treated in step (2) is heated at a temperature of 400° C., and then kept at temperature for 4 hours.

[0051] (4) Asymmetric extrusion die assembly

[0052] The extruded plate has an aspect ratio of 30 (thickness 15mm). According to the required plate specifications, assemble an asymmetric extrusion die; after the assembly is completed, assemble the extrusion punch and extr...

Embodiment 3

[0061] (1) Material preparation

[0062] 7000 series aluminum alloy composition: Zn13.4%, Mg2.4%, Cu1.6%, Ni0.20%, impurity ≤0.15%, the rest Al.

[0063] A deposition round ingot was prepared by a spray deposition process, the diameter of the deposition ingot was 300mm, and the height was 1000mm.

[0064] (2) Machining of deposited round ingots

[0065] The surface of the deposited round ingot is mechanically peeled and the end face of the ingot is flattened, and it is enough to see the light. The diameter of the processed blank is Ф280mm, and the height of the blank is 900mm.

[0066] (3) Deposition round ingot heating

[0067] The deposition round ingot treated in step (2) is heated at a heating temperature of 420° C. and a holding time of 6 hours.

[0068] (4) Asymmetric extrusion die assembly

[0069] The sheet material that can be extruded has a width-to-thickness ratio of 10 (thickness 20mm). According to the required plate specifications, assemble an asymmetric ex...

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Abstract

A method for preparing an ultra-high-strength and tough aluminum alloy sheet with a large aspect ratio, the steps are: using a spray deposition process to prepare a deposited round ingot, mechanically processing the deposited round ingot, then heating to 370°C-420°C, and keeping it warm for 2h-6h; assembling Asymmetrical extrusion mould; preheat the mold and the fixed cylinder as a whole, heating at 350°C~400°C, heat preservation for 12h~18h; hot extrusion forming sheet, extrusion rod running speed 0.1mm / s~2.5mm / s, extruding After the pressing is completed, carry out residual shearing; air-cool to room temperature for slab blanking. Using an asymmetric extrusion die for extrusion, by changing the extrusion flow state of the original billet, increasing the flow process of alloy deformation, effectively improving the uniformity of extrusion deformation, further refining the microstructure, and realizing the uniformity of the microstructure size of the extruded sheet Control; the tensile strength of the extruded plate of the present invention after heat treatment is 750-800Mpa, the yield strength is 710-760MPa, the elongation is 8-14%, the mechanical properties have no anisotropy, and the high-strength and tough aluminum alloy medium-thick plate has no Tail-shrinking extrusion molding improves material utilization.

Description

technical field [0001] The invention belongs to the technical field of metal plate preparation, and relates to a method for preparing an aluminum alloy plate, in particular to a method for preparing an aluminum alloy plate with a large width-thickness ratio and ultrahigh strength and toughness. Background technique [0002] 7000 series ultra-high-strength aluminum alloy sheets are widely used in the fields of aerospace, weapons, automobiles, and nuclear industries. At present, medium and heavy plates are produced by ingot hot rolling, and the rolling is generally completed by a hot roughing mill on a hot rolling production line. An independent hot rolling production line is built outside the production line, and cold rolling is required for thin medium plates to obtain the required performance and surface quality. [0003] The tensile strength, yield strength, elongation and other mechanical properties of the 7000 series ultra-high-strength aluminum alloy sheets prepared by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 陈伟陈刚章国伟翟景马力郭安振辛海鹰
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH