Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1636-1643.doi: 10.13229/j.cnki.jdxbgxb20180343

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Effect of creep and artificial aging on fatigue crack growth performance of 2524 aluminum alloy

Yi-lun LIU1,2(),Qing WANG1,Chi LIU1,Song-bai LI1,Jun HE1,Xian-qiong ZHAO1   

  1. 1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
    2. Light Alloy Research Institute, Central South University, Changsha 410083, China
  • Received:2018-04-13 Online:2019-09-01 Published:2019-09-11

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Abstract:

The effects of creep aging and artificial aging on the fatigue crack propagation properties of 2524 aluminum alloy were investigated. The influence of aging conditions on the fatigue properties of the alloy was analyzed based on the microstructure evolution of the alloy under TEM. The results show that the microstructures of artificial aging and creep aging alloys are mainly Cu-Mg clusters and GPB zones after aging for 4 h, showing good fatigue resistance. Compared with 4 h, after aging for 9 h the microstructures of the alloy are mainly acicular S′ phase. The appearance of these coarse S′ phases changes the slip mode of dislocation, which reduces the reversibility of slip and accelerates the accumulation of fatigue damage. Near the threshold section of Δ K ≤ 7 ? M P a · m 1 2 , the alloy fatigue resistance decreases significantly. The precipitate free zone appears at the grain boundary of the alloy after aging for 24 h, and the precipitates in the grain are also larger in size, further accelerating the fatigue crack growth rate of the alloy. Creep stress accelerates the precipitation process of alloy and compared with artificial aging, the creep aging alloy has larger precipitate size, higher yield strength and hardness, but lower fatigue resistance at the same aging time.

Key words: aerospace materials, fatigue crack propagation, fracture mechanics, 2524 aluminum alloy, creep aging, precipitate

CLC Number: 

  • TG146.2

Fig.1

Creep aging forming experiment schematic diagram"

Fig.2

Compact tensile sample (CT sample)"

Fig.3

TEM images of 2524 aluminum alloy under different treatment processes"

Fig.4

Diffraction patterns of 2524 aluminum alloy under different treatment processes"

Fig.5

Grain boundary TEM images of 2524 aluminum alloy under different treatment processes"

Fig.6

Mechanical properties of 2524 aluminum alloy under different aging conditions"

Fig.7

Fatigue crack growth rates of 2524 aluminum alloys under different creep aging times"

Fig.8

Fatigue crack growth rates of 2524 aluminum alloys under different aging conditions"

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