Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 662, Issue -, Pages 136-143Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.03.063
Keywords
Al-Mg-Si alloys; Friction-stir welding; Precipitation strengthening; Postweld heat treatment
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Funding
- Ministry of Education and Science, Russia [14.578.21.0097, RFMEFI57814X0097]
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In this work, a simple but effective approach for improvement of strength of friction-stir welded 6061-T6 aluminum alloys was elaborated. It involves friction-stir welding (FSW) at relatively high tool rotational speed and welding speed followed by standard post-weld aging. The selected combination of FSW parameters provides high welding temperature as well as rapid cooling rate. This leads to complete dissolution of strengthening precipitates in stir zone but hinders their coarsening in heat-affected zone. In turn, this enables to avoid the formation of softened region during subsequent aging and thus substantially enhances strength and improves ductility. (C) 2016 Elsevier B.V. All rights reserved.
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