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Al-Cu-Mg alloy with high-strength GoSS+P texture and excellent fatigue resistance and technology

An anti-fatigue, high-strength technology, which is applied in the field of Al-Cu-Mg alloy and thermal processing technology, can solve the problem that the formation temperature range of Goss texture and P texture is quite different, which has not been reported, and achieves the homogenization temperature Effects of time optimization, improvement of fatigue resistance, and reduction of segregation

Active Publication Date: 2018-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the large difference in the formation temperature ranges of the Goss texture and the P texture, the Goss texture tends to be formed at a lower temperature, while the P texture needs to be formed at a higher temperature. There is no technical solution on how to simultaneously obtain high-strength Goss+P texture in the prior art

Method used

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  • Al-Cu-Mg alloy with high-strength GoSS+P texture and excellent fatigue resistance and technology
  • Al-Cu-Mg alloy with high-strength GoSS+P texture and excellent fatigue resistance and technology
  • Al-Cu-Mg alloy with high-strength GoSS+P texture and excellent fatigue resistance and technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 (Goss+P: 19.04)

[0068] The composition of the alloy is 4.5% Cu, 1.2% Mg (Cu / Mg=3.7), 0.5% Mn, 0.06% Ti, 0.05% Fe, 0.05% Si, and the rest is aluminum. After the ingot was homogenized at 495°C / 48h, it was then hot-rolled at 485°C with a deformation of 96% for 80s, and then recrystallized annealed at 330°C for 240min, and then solidified at 490°C / 30min. The tensile properties of the aging plate obtained after solution quenching and natural aging treatment for 96 hours are: tensile strength is 429Mpa, yield strength is 297Mpa, elongation is 23.3%, fatigue performance is: ΔK=30MPam 1 / 2 , da / dN=1.4×10 ～3 mm / cycle.

Embodiment 2

[0069] Example 2 (Goss+P: 19.80)

[0070] The composition of the alloy is 4.4% Cu, 1.5% Mg (Cu / Mg=2.9), 0.4% Mn, 0.08% Ti, 0.03% Fe, 0.05% Si, and the rest is aluminum. After the ingot was homogenized at 475°C / 48h, it was then hot-rolled at 490°C with a deformation of 92% for 70s, and then recrystallized annealed at 320°C for 240min, and then solidified at 490°C / 50min. The tensile properties of the aging plate obtained after solution quenching and natural aging treatment for 96 hours are: tensile strength is 446Mpa, yield strength is 302Mpa, elongation is 24.3%, fatigue performance is: ΔK=30MPam 1 / 2 , da / dN=1.3×10 ～3 mm / cycle.

Embodiment 3

[0071] Example 3 (Goss+P: 19.34)

[0072] The composition of the alloy is 4.2% Cu, 1.20% Mg (Cu / Mg=3.5), 0.8% Mn, 0.05% Ti, 0.05% Fe, 0.02% Si, and the rest is aluminum. After the ingot was homogenized at 495°C / 48h, it was then hot-rolled at 490°C with a deformation of 85% for 50s, and then recrystallized annealed at 340°C for 150min, and then solidified at 480°C / 70min. The tensile properties of the aging plate obtained after solution quenching and post-natural aging treatment for 96 hours are: tensile strength is 442Mpa, yield strength is 295Mpa, elongation is 21.6%, fatigue performance is: ΔK=30MPam 1 / 2 , da / dN=1.5×10 ～3 mm / cycle.

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Abstract

The invention relates to an Al-Cu-Mg alloy with a high-strength Goss+P texture and excellent fatigue resistance and a technology. The alloy comprises 4.2-4.5% of Cu, 1.2-1.5% of Mg, 0.3-0.8% of Mn, 0.03-0.1% of Ti, less than 0.06% of Fe, and less than 0.06% of Si, wherein a mass ratio of Cu and Mg is 2.9-3.7. A hot processing method comprises the steps of homogenizing, quick high-temperature hot rolling, recrystallization annealing, solution hardening and natural ageing of an Al-Cu-Mg cast ingot. The technology is simple and reasonable, and a formation temperature of a P texture is reduced tobe the same as or close to a formation temperature of a Goss texture by controlling a Cu / Mg ratio of the alloy. Structural component segregation and nonuniform second-phase particle distribution are eliminated by homogenizing treatment; then, the high-temperature large deformation quick hot rolling is performed to form high-strength Brass texture; the high-strength Goss texture and the P texture are obtained by annealing and solution hardening treatment; deformation textures such as the Brass texture and a Copper texture are consumed to the greatest extent to form the high-strength Goss and Ptexture; fatigue crack propagation is impeded; and the alloy has the excellent fatigue resistance and is suitable for industrial application.

Description

technical field [0001] The invention discloses an Al-Cu-Mg alloy with excellent anti-fatigue performance and thermal processing technology; in particular, it relates to an Al-Cu-Mg alloy with high-strength Goss+P texture and excellent anti-fatigue performance and thermal processing Technology; belongs to the technical field of non-ferrous metal processing technology. Background technique [0002] Al-Cu-Mg series aluminum alloy has comprehensive properties such as low density, high strength, good casting performance, welding performance and processing performance. Its annealed and aged plates are widely used in the fields of aviation industry and civil industry, especially in It plays a very important role in the aviation industry and is one of the main structural materials in the aviation industry. After the 1980s, with the rapid development of the aerospace field, the requirements for aircraft are getting higher and higher, and their service environment is even harsher. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C21/14C22F1/057
CPCC22C21/14C22C21/16C22F1/002C22F1/057
Inventor 刘志义胡扬城刘飞陈烨贾鹏翔
Owner CENT SOUTH UNIV
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