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CN-121992258-A - High Cu 6 series aluminum alloy and processing technology thereof

CN121992258ACN 121992258 ACN121992258 ACN 121992258ACN-121992258-A

Abstract

The invention discloses a high Cu 6 series aluminum alloy and a processing technology thereof, wherein the aluminum alloy comprises the following components in percentage by mass of the 6 series aluminum alloy, ：Si：0.6～0.8 wt％、Mg：0.7～1.0 wt％、Cu 1.0~1.8 wt％、Mn ≤0.10 wt％、Cr ≤0.10 wt％、Zn ≤0.20 wt%、Ti≤0.10 wt％、Fe≤0.12 wt％, in percentage by mass of the 6 series aluminum alloy and the balance of Al and unavoidable impurities. According to the invention, the components and the processing technology of the high Cu 6-series aluminum alloy are reasonably optimized, so that the material has higher strength, better corrosion resistance and anode appearance are maintained, and the market application prospect is wide.

Inventors

  • ZHONG HAO
  • YANG DABIN
  • Wu Wenzi
  • LI JIE

Assignees

  • 广东中色研达新材料科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260314

Claims (9)

  1. 1. The 6-series aluminum alloy with high Cu is characterized in that the 6-series aluminum alloy comprises the following components in percentage by mass of ：Si：0.6～0.8 wt％、Mg：0.7～1.0 wt％、Cu 1.0~1.8 wt％、Mn ≤0.10 wt％、Cr ≤0.10 wt％、Zn ≤0.20 wt%、Ti≤0.10 wt％、Fe≤0.12 wt％, and the balance of Al and unavoidable impurities.
  2. 2. The high Cu 6-series aluminum alloy according to claim 1, wherein the mass ratio of Mg+Si to Cu is not less than 1.2.
  3. 3. The high Cu 6-based aluminum alloy as recited in claim 1 wherein the length of the strengthening phase is no more than 5nm.
  4. 4. A processing technology of a 6-series aluminum alloy with high Cu is characterized by comprising the following steps of carrying out three-level homogenization treatment on an ingot, extruding a homogeneous ingot and finally aging.
  5. 5. The process for processing the high Cu 6-series aluminum alloy according to claim 4, wherein the three-stage homogenization treatment is performed by heat preservation at 480-510 ℃ for 4-8 hours, then heat preservation at 520-535 ℃ for 8-12 hours, and then heat preservation at 540-550 ℃ for 8-24 hours.
  6. 6. The process for producing a high Cu-content aluminum alloy according to claim 4, wherein in the extrusion step, the rod temperature is 540 to 570 ℃ and the extrusion speed is 1.6 to 3.0mm/s.
  7. 7. The process for processing the high Cu 6-series aluminum alloy according to claim 4, wherein the aging process comprises the specific steps of heat preservation at 60-80 ℃ for 10-12h, heat preservation at 120-150 ℃ for 1-3h and heat preservation at 175-185 ℃ for 6-16h.
  8. 8. The process for processing the high Cu 6-series aluminum alloy according to claim 4, wherein the aging process comprises the specific steps of heat preservation at 60-80 ℃ for 10-1h, heat preservation at 120-150 ℃ for 1-3h, then cold working at 6-10% and heat preservation at 175-185 ℃ for 6-16h.
  9. 9. The process for producing a high Cu-content 6-series aluminum alloy according to claim 4, wherein the length of the 6-series aluminum alloy strengthening phase is less than 5nm.

Description

High Cu 6 series aluminum alloy and processing technology thereof Technical Field The invention relates to the technical field of high-Cu 6-series aluminum alloy, in particular to a high-Cu 6-series aluminum alloy and a processing technology thereof. Background The 6-series aluminum alloy has better anodic oxidation effect, molding property and moderate mechanical property, so that the 6-series aluminum alloy is widely applied to the fields of electronic information, new energy automobiles and the like. The 6-series aluminum alloy commonly used at present comprises 6063/6061/6082/6013 and other aluminum alloys. The aluminum alloy is used in the field of electronic information after being modified by components and processes, and mainly meets the anodic oxidation appearance requirement of materials. However, after the components and the process are modified, the yield strength is generally lower than 400MPa, and the higher strength requirement of the market is difficult to meet. Therefore, the high-strength 7-series aluminum alloy which is not corrosion-resistant is also applied to the field of electronic information, and the CNC and anode yield of the material are reduced due to the characteristic of being not corrosion-resistant. The Chinese patent application CN202510506493.4 provides an aluminum alloy for electronic information industry through deep refining purification and large extrusion ratio, the yield strength is more than 410MPa, but the extrusion ratio used by the technology of the patent application is 30-40, the extrusion ratio is actually the common extrusion ratio in industry, and the yield strength of the material is still lower than that of 7 series. In another example, chinese patent application CN202510125600.9 provides a high-appearance high-strength 6-series aluminum alloy with yield strength greater than 470MPa, which is strengthened by solid solution, but in practice, the extruded material is easy to cause recrystallized grain growth during solid solution and the component is easy to cause coarse grain layer during extrusion, and the coarse grain layer, once not milled cleanly in the subsequent CNC process, may cause anode mottle heterocolor, so that in practice, it is difficult to control grain size in industrial production. The Chinese patent application CN202111476570.4 provides an aluminum alloy material Al-Mg-Si-Cu alloy, the yield strength of the material can reach more than 450MPa after the process control, especially the cold working deformation is increased, but the alloy contains Al 2 Cu phase common in 2-series aluminum alloy, so that the corrosion resistance of the material can be rapidly reduced, and the material cannot be applied on a large scale. Therefore, it is necessary to provide a high Cu 6-series aluminum alloy with high strength, high corrosion resistance and high anode appearance and a processing technology thereof. Disclosure of Invention Based on the above, it is necessary to provide a high Cu 6-series aluminum alloy and a processing technique thereof. In a first aspect, the invention provides a high Cu 6-series aluminum alloy, wherein the 6-series aluminum alloy comprises the following components in percentage by mass of ：Si：0.6～0.8 wt％、Mg：0.7～1.0 wt％、Cu 1.0~1.8 wt％、Mn ≤0.10 wt％、Cr ≤0.10 wt％、Zn ≤0.20 wt%、Ti≤0.10 wt％、Fe≤0.12 wt％, and the balance of Al and unavoidable impurities. Mg, si are the main alloying elements in the 6-series aluminum alloy, which form the strengthening phase Mg 2 Si. When the alloy does not contain Cu, the content of the alloy can reach more than 1.0 weight percent, and the formed coarse Mg 2 Si phase can be dissolved into the matrix through the subsequent processing technology, so that the plasticity and the anodic oxidation effect are not reduced due to the existence of the coarse phase. When Cu is added into the system, the solid solubility of Mg and Si elements in the matrix is reduced, wherein 0.6-0.8wt% of Si and 0.7-1.0wt% of Mg are preferable, otherwise, coarse Mg 2 Si phases are formed in the system, so that the performance is reduced. Cu is mainly used for solid solution strengthening and work hardening in 6-series aluminum alloy and has the effect of promoting ageing strengthening, and especially the work hardening effect is particularly critical for improving the mechanical property of the material. In addition, the addition of Cu can lead to the formation of a strengthening phase Q phase (Al 4Si5Mg8Cu2) in the system, so that the strength of the material is further improved. However, too much Cu is added, and too little Mg or Si is contained, so that Al 2 CuMg (S) or Al 2 Cu (θ) phase is formed in the system. Although the two phases can improve the strength of the material, the material system is transited from 6-series to 2-series aluminum alloy, and the corrosion resistance of the material is greatly reduced, so that Cu is 1.0-1.8 wt%. Further, the mass ratio of Mg to Si to Cu is more than or equal to 1.2, the formation o