[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 17:51 No. of hits : 1736448 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 47 (2009), Issue 2

Exfoliation corrosion behavior of friction stir welded AA7136-T76 extrusions
KALEMBA, I., DYMEK, S., HAMILTON, C., WROBEL, M., BLICHARSKI, M.
vol. 47 (2009), no. 2, pp. 101 - 107

Abstract
This research program evaluates the exfoliation corrosion properties of AA7136-T76 extrusions joined through friction stir welding (FSW). AA7136 is an aluminum alloy developed for high strength aerospace applications that also demand corrosion resistance. Extrusions were joined by FSW using a force of 26.7 kN, a welding velocity of 2.1 mm/s and a tool rotation speed of 250 RPM. Corrosion tests were performed in accordance with the requirements of ASTM G 34 and revealed a performance gradient across the weld – the weld center showing the greatest resistance to exfoliation corrosion and the thermo-mechanically affected zone adjacent to the tool shoulder showing the worst resistance to corrosion. Microscopy revealed that corrosion behavior is correlated with the distribution of MgZn2 particles following supersaturation and cooling during FSW. In the weld center, coarse MgZn2 particles were found on grain boundaries and within the grains alike, but near the TMAZ/HAZ boundary, large precipitates occurred on grain boundaries surrounded by precipitate free zones.

Key words
friction stir welding, aluminum, aluminum alloys, microstructure, corrosion

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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