Microstructure, local and global mechanical properties of friction stir welds in aluminium alloy 6005A-T6

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 486; no. 1; pp. 85 - 95
• Main Authors: Simar, A., Bréchet, Y., de Meester, B., Denquin, A., Pardoen, T.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.07.2008; Elsevier
• Subjects: Aluminium alloys; Applied sciences; Differential scanning calorimetry (DSC); Elasticity. Plasticity; Exact sciences and technology; Friction stir welding; Joining, thermal cutting: metallurgical aspects; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Precipitation; Tensile test; Transmission electron microscopy (TEM); Welding; Precipitation; Differential scanning calorimetry (DSC); Aluminium alloys; Transmission electron microscopy (TEM); Friction stir welding; Tensile test; Differential scanning calorimetry; Heat treatment; Welding speed; Ductility; Mechanical properties; Aluminium alloy; Precipitation hardening; Tension test; Transmission electron microscopy; Heat affected zone; Microstructure
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.08.041

The effect of the welding speed on the microstructure, local and overall mechanical properties of friction stir welded joints has been investigated in the aluminium alloy 6005A-T6. The fine hardening precipitation within the heat-affected zone has been characterized by differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Post-welding heat treatments have been applied to obtain indications on the level of solid solution supersaturation in the as welded state. The local mechanical behaviour was determined using thin specimens extracted from various regions of the weld. The overall properties were measured on samples cut perpendicular to the weld. Specific attention was devoted to the relationship between the local microstructure and local hardening properties in the weakest region, which govern the overall strength and ductility of the welds.