Fracture micromechanisms in overaged 7000 alloy forgings

Cvijović, Z.; Cvijović, I.; Vratnica, M.

doi:10.1016/j.jallcom.2006.09.061

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…3(B–F) show, the particles predominantly damaged ahead of a crack tip contain a considerable concentration of Al, Fe, Cu and Mn. Almost all these particles were earlier identified as (Cu,Fe,Mn)Al 3 and Al 7 Cu 2 Fe particles (Cvijović et al , 2007) having the lower fracture strength. Since they easily fractured without absorbing much energy, it is apparent that alloys with higher Fe content have more of these detrimental particles and lower resistance to the FCG.…”

Section: Resultsmentioning

confidence: 99%

Fractographic analysis of fatigue damage in 7000aluminium alloys

Cvijović

Vratnica

Geric

2008

Journal of Microscopy

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Summary In this paper, an attempt is made to correlate the fatigue damage in 7000 aluminium alloys with different impurity contents to the microstructural features and to explain their interdependence through fractographic observations. The Paris constants of these alloys in the form of hot‐forged plates subjected to the overaged T73 temper are evaluated and differences in the fatigue crack growth rate described by striation spacing measurements. Scanning electron microscopy analysis of fatigue fracture surfaces revealed that the type and morphological parameters of coarse intermetallic particles play a critical role in fatigue crack growth behaviour. The elemental distribution determined by means of energy‐dispersive spectroscopy analysis showed that the fractured particles accelerating the crack advances are larger particles of Fe‐rich phases. The fatigue crack growth rate increases considerably with increasing amounts of these particles. The smaller η, S and Mg2Si particles contribute beneficially to fatigue life.

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Section: Resultsmentioning

confidence: 99%

Fractographic analysis of fatigue damage in 7000aluminium alloys

Cvijović

Vratnica

Geric

2008

Journal of Microscopy

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“…The area fractions of brittle (coarse voiding at IM particles, A Ap ) and ductile fracture regions (intergranular, A Ai , and transgranular, A At ) were also determined by image analysis. A more detailed description of this part of the experiment can be found elsewhere [22,24,27,28].…”

Section: Methodsmentioning

confidence: 99%

In-situ observation of the fracture process in Al–Zn–Mg–Cu alloys

Vratnica

2012

International Journal of Materials Research

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In-situ observation of the fracture process in Al-Zn-Mg-Cu alloys In order to investigate the fracture behaviour of highly-alloyed Al -Zn -Mg -Cu alloys as a function of alloy purity, in-situ observations using scanning electron microscopy were performed during tensile testing. The observations were used to verify proposed fracture mechanisms in conjunction with microstructural and fractographic analyses along with fracture toughness tests. It was found that the fracture process is complex. The nucleation, growth, and coalescence of voids precede ductile fracture of the alloys. The decohesion and fracture of intermetallic particles (generally >1 lm in diameter) appears to be the initial event in the fracture process, while mechanism and propagation rate of fracture depend on the alloy chemistry. A tortuous crack path and reduced crack propagation rate in the least pure alloy can be closely related to a strong interaction of the crack front with intermetallic particles.

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Room-temperature low-cycle fatigue and fracture behaviour of asymmetrically rolled high-strength 7050 aluminium alloy plates

Hou

Xiao

et al. 2021

International Journal of Fatigue

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Fracture micromechanisms in overaged 7000 alloy forgings

Cited by 7 publications

References 21 publications

Fractographic analysis of fatigue damage in 7000aluminium alloys

Fractographic analysis of fatigue damage in 7000aluminium alloys

In-situ observation of the fracture process in Al–Zn–Mg–Cu alloys

Room-temperature low-cycle fatigue and fracture behaviour of asymmetrically rolled high-strength 7050 aluminium alloy plates

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