Abstract
Microstructure evolution in friction stir welds produced in artificially aged Al–4Cu–1Li–0·36Mg–0·14Zr–0·28Ag alloy over a range of process parameters was studied using transmission electron microscopy. Process parameters did not have a major effect on the weld microstructure and mechanical properties. The stir zone exhibited an appreciable decrease in hardness relative to the unaffected base metal due to dissolution of T1 and θ′ precipitates. The heat affected zone exhibited almost complete dissolution of θ′ precipitates and partial dissolution of T1 precipitates. The effect of process conditions on T1 precipitate density in the heat affected zone was studied and it was found that dissolution was experienced at lower tool rotation speed to traverse rate ratios, while welds produced at higher tool rotation speed to traverse rate ratios experienced both dissolution and growth of T1 precipitates. The results obtained on this thin sheet aluminium alloy were compared to those of friction stir welds produced in thicker sections of the same alloy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
