Influence of Particles on Short Fatigue Crack Initiation in 2050-T8 and 7050-T74

Erembert Nizery; Jean Yves Buffière; Henry Proudhon; Armelle Daniélou; Samuel Forest

doi:10.4028/www.scientific.net/MSF.794-796.296

Paper Titles

Prediction of Fatigue Life for Light Metals and their Welded Metals
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Effect of Cold Plastic Deformation Prior to Ageing on Creep Resistance of an Al-Cu-Mg-Ag Alloy
p.278

Influence of Processing Route on the Work-Hardening and Ductile Fracture of an AA6060 Aluminium Alloy
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Effect of Electroless Ni-P Plating on the Fatigue Strength of Dilute Al-Si Alloys
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Influence of Particles on Short Fatigue Crack Initiation in 2050-T8 and 7050-T74
p.296

Grain-Size Dependency of Low-Temperature Creep in Ultrafine-Grained Aluminum
p.302

Extrapolation of Creep Curve and Creep Rate by Strain Acceleration Parameter in Al-Mg Solid Solution Alloys
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Analysis of Small Fatigue Crack in Al-Mg-Si Aluminum Alloy
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Modeling of the Influence of Pore Morphology on Damage Behavior of an Aluminum Die Casting Alloy
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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Influence of Particles on Short Fatigue Crack...

Influence of Particles on Short Fatigue Crack Initiation in 2050-T8 and 7050-T74

Abstract:

The mechanisms of fatigue crack initiation due to second phase particles are studied in 2050-T8 and 7050-T74 plate material. The particles in the specimens gauge lengths are imaged using SEM at the initial state. In 7050-T74, Mg₂Si particles are very often cracked before any loading, whereas Al₇Cu₂Fe particles are not. In 2050-T8, the fraction of (Al, Cu, Fe, Mn) particles initially cracked is larger than that of Al₇Cu₂Fe in 7050-alloy, but lower than that of Mg₂Si particles for similar sizes. For (Al, Cu, Fe, Mn) particles, the proportion of cracked particles increases when the modified shape ratio (aspect ratio including orientation versus rolling direction) increases. This effect is present but less pronounced for Mg₂Si particles in 7050-T74. Fatigue cracks initiate at cracked (Al, Cu, Fe, Mn) particles in 2050-T8 alloy, and at both Al₇Cu₂Fe (cracked during cycling) and Mg₂Si in 7050-T74 alloy.

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Materials Science Forum (Volumes 794-796)

Pages:

296-301

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.296

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Online since:

June 2014

Authors:

Erembert Nizery*, Jean Yves Buffière, Henry Proudhon, Armelle Daniélou, Samuel Forest

Keywords:

2050-T8, 7050-T74, Fatigue, Intermetallic Particles, Short Crack

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