Is it possible that iron based precipitates in combination to al and si may form in al-mg-si alloys (specially in AA 6061-T6) as a result of some mechanical processing like welding or forming.The question why arises is that most of the literature regarding the formation of 2nd phase particles in Al-Mg-Si alloys like AA 6061-6 reported to observe mostly Mg2si particles. But few of my samples of friction stir welded AA 6061-T6 is showing 10-16 % of iron including al ,mg, and si (mg very less) under EDS analysis in BSE mode.
Iron % is not more than 1% in AA 6061-t6 but you got 10 to 16% then chances are very less to get prescipitates in welding or forming
Iron is a very common impurity in aluminum alloys, which can come from the melting and casting process. So in Al–Si–Fe system there are Fe-rich precipitates that you can found: Al3Fe, Al13Fe4, Al8Fe2Si, Al12Fe3Si2, Al5FeSi, Al4FeSi2 and Al3FeSi.
I recommend you read the literature bellow:
P. Skjerpe, Metall. Mater. Trans. A, 18A (1987), pp. 189-200
M.V. Kral, H.R. McIntyre, M.J. Smillie, Scr. Mater., 51 (2004), pp. 215-219
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