Effects of Microstructure on the Incipient Fatigue and Fretting Crack Processes in Al-Cu-Li Alloys

Delacroix, Jessica; Jean-Yves, Buffiere; Fouvry, S.; Daniélou, Armelle

doi:10.1520/stp49290s

Cited by 3 publications

(5 citation statements)

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“…This qualitative observation which has been consistently made on the different samples observed in 3D could account for the better resistance of the UA treatment and could be a result of the microstructure induced by the heat treatment. Similar observations have been conducted during fatigue tests of samples with a central hole on the same materials/heat treatments : the UA microstructure induced a more tortuous crack path (with the crack following crystallographic directions) than for the T8 microstructure [4]. In UA temper, the slip mode is probably more crystallographic in fatigue but also in fretting conditions.…”

Section: D Observation Of Fretting Crackssupporting

confidence: 70%

“…After heat treatment, a mixture of semi-coherent T 1 and coherent δ ′ precipitates has been observed by transmission electron microscopy [4] in the 2196 alloy in the T8 condition while δ ′ are predominant in the UA condition. In the 2050 alloy a majority of T 1 precipitates has been found in the T8 condition while no significant precipitation could be observed in the UA condition.…”

Section: %C Umentioning

confidence: 99%

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Influence of Microstructure on the Fretting Resistance of Al‐Cu‐Li Alloys

Delacroix¹,

Cazottes²,

Daniélou³

et al. 2012

ICAA13: 13th International Conference on Aluminum Alloys

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The resistance of two Al-Cu-Li alloys (2050 and 2196) to fretting has been investigated. For each material two heat treatments have been studied (T8 and low temperature ageing).Fretting tests with a cylinder-plane configuration have been performed in the partial slip regime. The results obtained show that the low temperature temper gives a better resistance to fretting crack initiation and propagation than the T8 temper for both alloys. The 3D shape of the fretting cracks has been observed by high resolution synchrotron X-ray tomography. Multiple initiation sites were observed below the contact. In their early stages of development, the fretting cracks grow approximately radially within the material leading to thumb nail cracks which eventually merge laterally. The difference in fretting resistance is analysed with respect to the 3D fracture surface of the fretting cracks in relation with the alloys precipitation state.

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Section: D Observation Of Fretting Crackssupporting

confidence: 70%

Section: %C Umentioning

confidence: 99%

Influence of Microstructure on the Fretting Resistance of Al‐Cu‐Li Alloys

Delacroix¹,

Cazottes²,

Daniélou³

et al. 2012

ICAA13: 13th International Conference on Aluminum Alloys

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show abstract

“…For the experimental conditions investigated, the two alloys in the UA conditions exhibit a better resistance to fretting damage which is attributed to a more tortuous crack path observed in 3D below the contact. This higher tortuosity can be linked to a microstructure which promotes planar slip (shearable precipitates), as observed on larger fatigue samples [4].…”

Section: Discussionmentioning

confidence: 78%

“…In the 2050 alloy a majority of T 1 precipitates has been found in the T8 condition while no significant precipitation could be observed in the UA condition. Both alloys exhibit a classical rolling texture with a low fraction of recrystallised grains in the 2050 alloy [4]. Those grains have a classical pancake shape with a very large dimension along the rolling direction (L).…”

Section: %C Umentioning

confidence: 99%

Influence of microstructure on the fretting resistance of Al-Cu-Li alloys

et al. 2012

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“…The lateral width of the cylinder pad was about 8 mm, allowing plane strain conditions to be assumed along the median axis of the fretting scar. Preliminary tests determined the friction coefficient at the sliding transition m t ¼ 0.85 [4] wherever the applied fretting stressing, a crack arrest condition would be systematically achieved. Fig.…”

Section: Plain Fretting Experimentsmentioning

confidence: 99%