Fatigue crack growth in friction stir welds of 6082-T6 and 6061-T6 aluminium alloys: A comparison

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Moreira, PMGP (Author) FEUP; de Jesus, AMP (Author) Other; Ribeiro, AS (Author) Other; de Castro, PMST (Author) FEUP

Journal

Title: Theoretical and Applied Fracture Mechanics

Vol. 50 No. 2

Pages: 81-91

ISSN: 0167-8442

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 54 Citations

ISI Web of Science

Scopus - 73 Citations

INSPEC

COMPENDEX

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences

Other information

Authenticus ID: P-003-W2W

DOI: 10.1016/j.tafmec.2008.07.007

Abstract (EN): Friction stir welding (FSW) is a solid-state joining process which emerged as an alternative technology to be used in high strength alloys that were difficult to join with conventional techniques. Notwithstanding the widespread interest in the possibilities offered by FSW, data concerning the fatigue behaviour of joints obtained using this process still is scarce. In this work, a comparative study between fatigue crack growth behaviour of friction stir welds of 6082-T6 and 6061-T6 aluminium alloys is carried out. Fatigue crack growth curves were determined for cracks growing in different locations of the weldments, including the base material, the heat affected zone and the welded material. Generally, friction stir material exhibited lower strength and ductility properties than the base material. However, an enhanced crack propagation resistance is observed in the welded material. The 6082-T6 and 6061-T6 base materials exhibit very similar crack propagation behaviours. On the other hand the friction stir 6061-T6 material shows lower crack propagation rates than corresponding 6082-T6 friction stir material. Particular features of the distinct microstructures of the welded and surrounding material are illustrated using scanning electron microscopy.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11