Method for improving damage tolerance performance of Al-Cu-Mg alloy

An al-cu-mg, alloy technology is applied in the field of improving the damage tolerance performance of Al-Cu-Mg alloy and improving the stress field intensity factor of Al-Cu-Mg alloy during fatigue fracture, which can solve the problem of unseen aluminum alloy sheets. Damage tolerance performance and other issues

Inactive Publication Date: 2016-07-06
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there are no public reports on the use of pre-deformation and heat treatment processes to improve the damage tolerance of aluminum alloy sheets

Method used

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  • Method for improving damage tolerance performance of Al-Cu-Mg alloy
  • Method for improving damage tolerance performance of Al-Cu-Mg alloy
  • Method for improving damage tolerance performance of Al-Cu-Mg alloy

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Experimental program
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Effect test

Embodiment 1

[0031] The composition of the alloy is Cu3.9%, Mg1.1%, Mn0.2%, Fe0.08%, Si0.04%, Zn0.08%, Ti0.06%, and the balance is Al. Solution quenching for 10 minutes, followed by cold rolling pre-deformation treatment with a deformation amount of 6%, and finally natural aging for at least 96 hours. The tensile properties of the obtained plate are: tensile strength is 443.29MPa, yield strength is 371.21MPa, and elongation is 23.39%. The damage tolerance performance is: ΔK=38.75MPam corresponding to fatigue fracture 1 / 2 ;Corresponding fatigue crack growth rate da / dN=1.55×10 -3 mm / cycle.

Embodiment 2

[0033] The composition of the alloy is Cu4.2%, Mg1.4%, Mn0.5%, Fe0.09%, Si0.03%, Zn0.06%, Ti0.05%, and the balance is Al. Solution quenching for 30 minutes, followed by cold rolling pre-deformation treatment with a deformation amount of 7.9%, and finally natural aging for at least 96 hours. The tensile properties of the obtained plate are: tensile strength is 445.24MPa, yield strength is 376.11MPa, and elongation is 22.05%. The damage tolerance performance is: ΔK=38.26MPam corresponding to fatigue fracture 1 / 2 ;Corresponding fatigue crack growth rate da / dN=1.69×10 -3 mm / cycle.

Embodiment 3

[0035] The composition of the alloy is Cu4.5%, Mg1.8%, Mn0.9%, Fe0.05%, Si0.05%, Zn0.06%, Ti0.07%, and the balance is Al. Solution quenching for 60 minutes, followed by cold rolling pre-deformation treatment with a deformation amount of 12.1%, and finally natural aging for at least 96 hours. The tensile properties of the obtained plate are: the tensile strength is 449.35MPa, the yield strength is 382.52MPa, and the elongation is 19.22%. The damage tolerance performance is: ΔK=39.47MPam corresponding to fatigue fracture 1 / 2 ;Corresponding fatigue crack growth rate da / dN=8.60×10 -3 mm / cycle.

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Abstract

A method for improving the damage tolerance performance of an Al-Cu-Mg alloy is to carry out a solid solution + water quenching treatment on an Al-Cu-Mg alloy plate, and then perform a cold rolling pre-deformation treatment with a deformation amount of 6-15%, and then Perform aging treatment. The process of the invention is simple and reasonable, through cold rolling with small deformation amount after solid solution quenching, a certain compressive stress layer is generated on the surface of the plate, and the formation and expansion of cracks under the action of fatigue stress are effectively inhibited. With the natural aging treatment, the surface layer has a large density of dislocations due to the pre-deformation of cold rolling, which makes the alloy precipitate large-sized Cu-Mg atomic clusters during the natural aging process, and increases the Cu/Mg mass ratio of the clusters, so that The surface layer of the plate produces a large order strengthening effect and modulus strengthening effect; artificial aging treatment can cause the plate to precipitate a fine and dispersed second phase, and at the same time, the higher density dislocations on the surface can form a finer and dispersed second phase on the surface of the plate. Two phases, thereby hindering the formation and propagation of fatigue cracks in the surface area, and improving the fatigue resistance damage tolerance performance of the plate. This surface-hard-core-tough structure can effectively improve the damage tolerance performance of the plate, and is suitable for industrial applications.

Description

technical field [0001] The invention discloses a method for improving the anti-damage tolerance performance of Al-Cu-Mg alloy; in particular, it relates to a method for improving the stress field intensity factor during fatigue fracture of Al-Cu-Mg alloy, which belongs to the field of non-ferrous metal material processing. Background technique [0002] Due to its medium strength, good toughness and excellent fatigue resistance, Al-Cu-Mg alloy is a precipitation hardening aluminum alloy widely used in aerospace, especially as aircraft skin and bulkhead materials, accounting for the weight of aircraft materials About 50% of the aviation industry has an extremely important position in the aviation field. However, with the development of aviation technology, aircraft structural materials are required not only to have high static strength, but also to have good damage tolerance performance. Damage tolerance performance not only refers to the low rate of fatigue crack growth, Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057C22C21/18C22C21/16
CPCC22F1/057C22C21/14C22C21/16C22C21/18
Inventor 刘志义赵齐刘梦黄田田
Owner CENT SOUTH UNIV
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