The strength of friction stir welded and friction stir processed aluminium alloys

Local strength of friction stir (FS) welds and FS processed aluminium alloys in heat-treatable aluminium alloys is dominated by precipitation hardening. Strengthening due to stored dislocations is generally limited to 40 MPa, and grain size strengthening is generally less than 10 MPa. Local crystall...

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Bibliographic Details
Published in:	Scripta materialia Vol. 58; no. 5; pp. 377 - 382
Main Authors:	Starink, M.J., Deschamps, A., Wang, S.C.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-03-2008 Elsevier
Subjects:	Aluminium alloys Aluminum base alloys Chemical and Process Engineering Chemical Sciences Engineering Sciences Friction stir welding Heat treatment Material chemistry Phase transformations Recrystallized microstructure Strength Strengthening Surface layer Texture Transmission electron microscopy (TEM) Welded joints Yield strength Yield strength Aluminium alloys Phase transformations Transmission electron microscopy (TEM) Recrystallized microstructure Transmission electron microscopy TEM
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Summary:	Local strength of friction stir (FS) welds and FS processed aluminium alloys in heat-treatable aluminium alloys is dominated by precipitation hardening. Strengthening due to stored dislocations is generally limited to 40 MPa, and grain size strengthening is generally less than 10 MPa. Local crystallographic texture can cause yield strength variation on the order of 5%. Published models for strengthening of FS welds make a range of simplifying assumption which can cause uncertainties in the predictions of up to 50 MPa. Possible improvements are explored.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1359-6462 1872-8456
DOI:	10.1016/j.scriptamat.2007.09.061