Microstructure Evolution during Friction Stir Welding of Aluminum Alloy AA2219

Arora, K S and Pandey, S and Schaper, M and Kumar, Rajneesh (2010) Microstructure Evolution during Friction Stir Welding of Aluminum Alloy AA2219. Journal of Materials Science & Technology, 26 (8). pp. 747-753.

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The characterization of microstructure evolution in friction stir welded aluminum alloy was carried out by optical microscopy (OM) and transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The weld nugget consisted of very fine equiaxed grains and experienced dissolution of nearly half of metastable precipitates into the matrix during welding. Thermomechanically affected zone (TMAZ) also experienced dissolution of precipitates but to a lesser extent whereas coarsening of precipitates was observed in heat affected zone (HAZ). Grain boundary misorientation measurements using EBSD indicated continuous dynamic recrystallization as the underlying mechanism for the fine equiaxed nugget grains. The yield and tensile strength of the weld decreased with comparison to base material. But due to the decrease of grain size and the dissolution of second phase precipitates, an increased Charpy energy value was observed in the weld nugget.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/S1005-0302(10)60118-1
Uncontrolled Keywords:Friction stir welding; AA2219; Precipitates; Vickers hardness; Tensile testing; Charpy impact energy
ID Code:2005
Deposited On:04 Nov 2010 10:51
Last Modified:13 Dec 2011 15:56

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