Journal
MATERIALS & DESIGN
Volume 32, Issue 4, Pages 2021-2027Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2010.11.059
Keywords
Non-ferrous metals and alloys; Welding; Microstructure
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The scope of this investigation is to evaluate the effect of joining parameters on the mechanical properties, microstructural features and material flow of dissimilar aluminium alloys (3 mm-thick AA2024-T3 and AA7075-T6 sheets) joints produced by friction stir welding. Mechanical performance has been investigated in terms of hardness and tensile testing. Material flow using the stop action technique has also been investigated in order to understand the main features of the mixing process. No onion ring formation has been observed; the boundary between both base materials at the stir zone is clearly delineated. i.e., no material mixing is observed. A non-stable rotational flow inside the threads has been identified due to the formation of a cavity on the rear of the pin. Microstructural observation has revealed the development of a recrystallised fine-grained stir zone, with two different grain sizes resulting from the two different base materials. (C) 2010 Elsevier Ltd. All rights reserved.
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