Microstructural and Mechanical Characteristics of Aluminum Alloy AA5754 Friction Stir Spot Welds

作者：Mahmoud T S^*; Khalifa T A

来源：Journal of Materials Engineering and Performance, 2014, 23(3): 898-905.

DOI：10.1007/s11665-013-0828-0

• aluminum alloys
• friction stir spot welding
• mechanical properties
• microstructure

In the present investigation, friction stir spot welding on annealed aluminum alloy AA5754 sheets was performed. The influences of the tool rotational speed and tool stirring (dwell) time on the weld structure and static strength of welds were evaluated. The results revealed that the width of the completely metallurgical-bonded region increases with the increasing tool rotational speed and/or the dwell time up to certain levels. Increasing such parameters beyond these levels slightly reduces the width of the bonding region. The stirred zone exhibited higher microhardness than that of the base material. The tensile-shear force was found to increase with the increasing tool rotational speed and/or dwell time up to a certain level (9s). Higher tool rotational speeds and/or prolonged dwell times slightly reduce(s) the tensile-shear force.

• 出版日期2014-3