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A heat treatment process that significantly improves the comprehensive performance of aluminum alloys

A comprehensive performance and alloy technology, which is applied in the field of heat treatment of non-ferrous metals, can solve problems such as poor operability, increased production costs, and large damage to production equipment, so as to improve the strength-plastic fit, improve alloy toughness, and avoid growth. Effect

Active Publication Date: 2015-11-11
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are limited to the processing of small-sized samples with complex procedures and high equipment requirements, and cannot meet the production requirements of large aluminum alloy components used in large components, or carry out extremely dangerous production operations in liquid nitrogen temperature environments. The damage to the production equipment is relatively large, and the production cost will further increase
All in all, these methods have poor operability in actual industrial applications, and their technical routes are far from meeting the requirements of aluminum alloy large structural parts

Method used

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  • A heat treatment process that significantly improves the comprehensive performance of aluminum alloys
  • A heat treatment process that significantly improves the comprehensive performance of aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The sample adopts Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy cold-rolled sheet with a thickness of 2.0mm. According to GB228-76 to make tensile samples. Put the sample into a salt bath furnace at 495-505°C for solid solution treatment, take it out and quench it immediately; then put it into an aging box for pre-aging treatment, the aging temperature is 100°C, and the aging time is 12h; then asymmetric rolling The surface speed ratio of the roll is 1.3, the deformation is ~9%, and the deformation temperature is room temperature; finally, it is artificially aged at 100°C for 48 hours. The yield strength, tensile strength and elongation parameters of the Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy treated in this example are shown in Table 1.

Embodiment 2

[0023] The sample adopts Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy cold-rolled sheet with a thickness of 2.0mm. According to GB228-76 to make tensile samples. Put the sample into a salt bath furnace at 495-505°C for solid solution treatment, take it out and quench it immediately; then put it into an aging box for pre-aging treatment, the aging temperature is 100°C, and the aging time is 6h; Rolling, the deformation temperature is 250°C, the surface speed ratio of the roll is 1.1, and the deformation is ~10%; finally, natural aging is carried out for 12 days. The yield strength, tensile strength and elongation parameters of the Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy treated in this example are shown in Table 1.

Embodiment 3

[0025] The sample adopts Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy cold-rolled sheet with a thickness of 2.0 mm. According to GB228-76 to make tensile samples. Put the sample into a salt bath furnace at 495-505°C for solid solution treatment, take it out and quench it immediately; then put it into an aging box for pre-aging treatment, the aging temperature is 60°C, and the aging time is 60h; Rolling treatment, the deformation temperature is 150°C, the surface speed ratio of the roll is 1.5, and the deformation is ~40%; finally, the final aging is carried out at 150°C-8h. The yield strength, tensile strength and elongation parameters of the Al-4.45Cu-1.5Mg-0.54Mn aluminum alloy treated in this example are shown in Table 1.

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Abstract

The invention relates to a hot treatment process for remarkably improving the comprehensive performance of aluminum alloy. According the hot treatment process, aluminum-copper-magnesium alloy in a solid solution state undergoes pre-aging treatment, asymmetric rolling deformation and secondary aging treatment; one part of atoms are segregated through pre-aging to form nanometer scale atomic clusters which block dislocation movement during subsequent deformation to form meshy dislocation cells or sub-boundary to refine grains; the other part of undecomposed solute atoms obtain vacancy / atomic cluster complex, G.P. zone, microtexture and special shearing texture under the strain action of subsequent deformation high shear stress; one part of fine grains grow with the aid of grain boundary migration due to the interaction of the compound textures during secondary aging to form a dual grain structure, so that the strength-plasticity coordination of the alloy is improved, and the toughness of the alloy is improved. The hot treatment process is simple, safely operated and conveniently, easily industrialized, and is a novel hot treatment technology with great application prospect; the comprehensive performance of the alloy is effectively improved through improving the microtexture of alloy according to the hot treatment process.

Description

technical field [0001] The invention relates to a heat treatment process for aluminum alloys, in particular to a heat treatment process for significantly improving the comprehensive performance of aluminum-copper-magnesium alloys; it belongs to the technical field of non-ferrous metal heat treatment processes. technical background [0002] Improving the strength of materials has always been a core issue in materials research. The strengthening of materials is often accompanied by a sharp decrease in plasticity or toughness, while the strength of high plasticity and toughness materials is often very low. For a long time, the "inverted relationship" of strength and toughness of this material has become a bottleneck restricting the development of materials. In order to enable aluminum alloys to further meet the requirements of higher comprehensive performance, the improvement of the comprehensive performance of aluminum alloys has become a hot spot in the aluminum alloy indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/057
Inventor 陈志国任杰克陈继强
Owner CENT SOUTH UNIV
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