Orientation relationships and morphology of S phase in friction stir welded Al–Cu–Mg alloy
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It is generally believed that S phase has lath-morphology. Both lath and rod-shaped S phase were observed in the present study and a closer observation of the selected area diffraction patterns (SADPs) revealed an interesting difference in their orientation relationship with the matrix. A modified orientation relationship has been recently discovered and related to the S phase morpholgy. Although at this time, the effect of the orientation relationship and morphology of S phase on the mechanical properties of Al–Cu–Mg alloys is not understood, it is worthwhile to investigate this observation for increasing the understanding of S phase precipitation and growth. Although there have been several investigations relating to the microstructure of friction stir welds in Al–Cu–Mg alloys [1, 2, 3, 4], precipitation and growth of S phase in these welds have not been adequately addressed.
KeywordsHRTEM Orientation Relationship Heat Affected Zone Heat Affected Zone Friction Stir Welding
The authors would like to thank Dr. Libor Kovarik for the useful discussions.
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