Effects of microstructural heterogeneity on very high cycle fatigue properties of 7050-T7451 aluminum alloy friction stir butt welds

Deng, Caiyan; Wang, Hong; Gong, Bin; Li, Xiang; Lei, Zhenyu

doi:10.1016/j.ijfatigue.2015.10.001

Cited by 52 publications

(22 citation statements)

References 29 publications

(36 reference statements)

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“…Unreasonable process parameters are likely to make defects. The summary of stress amplitude-half of the stress range ∆σ corresponding to 95% survival rate-for N f = 10 [6] with the optimal process parameters is shown in Table 1 [24,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56].…”

Section: Process Parametersmentioning

confidence: 99%

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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The application fields of friction stir welding technology, such as aerospace and transportation, has high safety requirements and fatigue is the dominant failure mode for weldments. It is of great significance to understand the fatigue properties of friction stir welded joints. This paper provides an overview of the fatigue mechanism, influencing factors, crack growth rate, and fatigue life assessment. It is found that the fatigue performance of friction stir welded joints can be affected by welding process parameters, test environment, stress ratio, residual stress, and weld defect. The optimized process parameters can produce high quality weld and increase the weld fatigue life. Laser peening is an effective post weld treatment to decrease fatigue crack growth rate and improve material fatigue life.

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Section: Process Parametersmentioning

confidence: 99%

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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“…Heterogeneous aluminum oxide (Al 2 O 3 ) and aluminum nitride (AlN) layers contributed to the nucleation of superficial cracks. The decrease in fatigue strength is associated to the improvement in the atomic diffusion and to an heterogeneous ceramic layer which, consequently, induce a surface rearrangement reducing micro and nanohardness of treated materials [20].…”

Section: Experiments Longitudinal Transversalmentioning

confidence: 99%

Plasma immersion ion implantation: Influence on the rotating bending fatigue strength of AA 7050-T7451 aluminum alloy

Minto

Oliveira

Voorwald

2017

International Journal of Fatigue

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Failures in structural components due to cyclic loading are associated with the surface damage. The aircraft industry has been searched into the alternative coatings that enhance performance by reducing the environmental impact. Coatings deposited by different surface processes are more or less effective to improve fatigue life of diverse elements. The sulphuric and chromic anodizing methods were applied on AA 7050-T7451 aluminum alloy. The study results were compared with the plasma immersion ion implantation for different experimental parameters. This investigation aims to study plasma immersion ion implantation (PIII) effect on the fatigue life of rotating and bending on AA 7050-T7451 aluminum alloy. Experimental results indicate that the implantation setup of low impact frequency increases the fatigue life and improves the roughness without decrease in the microhardness of base material. The implantation of high impact frequency reduces the fatigue life of base material even more than both anodizing processes.

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“…Jo et al [11] and Park et al [12] investigated the effect of Mn addition to the Al-Zn-Mg alloy on the formation of dispersive particles, affecting the resistance of the alloys to fatigue cracking during cyclic tension-compression. Similarly, Deng et al [13] studied strength properties of friction-welded joints in the 7050 alloy in tension-compression fatigue tests.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

Kowalski

Ozgowicz

Jurczak

et al. 2018

Metals

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Abstract:The present manuscript aims to determine the effect of various deformation levels during low-temperature thermo-mechanical treatment (LTTT) on the microstructure and fatigue strength of Zr-microalloyed Al-Zn-Mg alloy. The fatigue strength of the alloy was studied in high-cycle bending-torsion tests. The determination of the influence of plastic deformation level during LTTT on the microstructure was based on transmission electron microscopy (TEM) observations. The analysis of fracture after the fatigue tests was performed based on fractographic images using scanning electron microscopy (SEM). It was found that the major factor affecting the microstructure of the alloy, and determining the nature of fatigue fracture, is the strain level applied during LTTT.

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Effects of microstructural heterogeneity on very high cycle fatigue properties of 7050-T7451 aluminum alloy friction stir butt welds

Cited by 52 publications

References 29 publications

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Plasma immersion ion implantation: Influence on the rotating bending fatigue strength of AA 7050-T7451 aluminum alloy

Microstructural and Fractographic Analysis of Plastically Deformed Al-Zn-Mg Alloy Subjected to Combined High-Cycle Bending-Torsion Fatigue

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