<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Intergranular corrosion sensitivity is studied for the friction stir weld nugget of aluminum alloy 2050-T8. The weld nugget consists of fine equiaxed grains having average sizes from 4 to 20 μm, the grain size increases with decreasing of the distance from the weld surface. The weld nugget contains a particular microstructure called "onion rings" due to crystallographic orientations. The effect of the "onion rings" on stress corrosion cracks initiation is studied for stress corrosion cracking tests at a strain rate of 2.10-6 s-1. EBSD cartographies allow showing that the initiation site of the biggest cracks is located at boundaries between the texture bands. Corrosion and stress corrosion tests in 1.0 M NaCl are performed in order to show stress effect on intergranular corrosion. Pitting corrosion is observed during corrosion tests, whereas intergranular cracks appear during stress corrosion tests. The medium crack length is 20 μm and 168 cracks per mm2 can be located. In these severe laboratory conditions, the order of magnitude of long crack growth rate is 5.10-8 m.s-1.</abstract>

Intergranular corrosion sensitivity is studied for the friction stir weld nugget of aluminum alloy 2050-T8. The weld nugget consists of fine equiaxed grains having average sizes from 4 to 20 μm, the grain size increases with decreasing of the distance from the weld surface. The weld nugget contains a particular microstructure called "onion rings" due to crystallographic orientations. The effect of the "onion rings" on stress corrosion cracks initiation is studied for stress corrosion cracking tests at a strain rate of 2.10-6 s-1. EBSD cartographies allow showing that the initiation site of the biggest cracks is located at boundaries between the texture bands. Corrosion and stress corrosion tests in 1.0 M NaCl are performed in order to show stress effect on intergranular corrosion. Pitting corrosion is observed during corrosion tests, whereas intergranular cracks appear during stress corrosion tests. The medium crack length is 20 μm and 168 cracks per mm2 can be located. In these severe laboratory conditions, the order of magnitude of long crack growth rate is 5.10-8 m.s-1.

Intergranular stress corrosion cracking of friction stir welded nugget on a 2050-T8 aluminum alloy

Université de Bordeaux, I2M-Dumas, UMR 5295, 351 cours de la Libération 33405 TALENCE CEDEX FRANCE

Art et Métier ParisTech, I2M-Dumas, UMR 5295, Esplanade des Arts et Métiers 33405 Talence Cedex FRANCE

CNRS, I2M-Dumas, UMR 5295, 351 cours de la Libération 33405 TALENCE CEDEX France

Advances in Materials Science

Intergranular corrosion sensitivity is studied for the friction stir weld nugget of aluminum alloy 2050-T8. The weld nugget consists of fine equiaxed grains...

Intergranular stress corrosion cracking of friction stir welded nugget on a 2050-T8 aluminum alloy

Published Online: Nov 16, 2011

Page range: 43 - 50

DOI: https://doi.org/10.2478/v10077-011-0016-6

Keywords
Aluminum alloy, intergranular stress corrosion cracking, Friction Stir Welding

This content is open access.

Intergranular stress corrosion cracking of friction stir welded nugget on a 2050-T8 aluminum alloy

Published Online: Nov 16, 2011

Page range: 43 - 50

DOI: https://doi.org/10.2478/v10077-011-0016-6

KeywordsAluminum alloy, intergranular stress corrosion cracking, Friction Stir Welding

This content is open access.

Keywords
Aluminum alloy, intergranular stress corrosion cracking, Friction Stir Welding