Suppression of abnormal grain growth in friction-stir welded Al–Cu–Mg alloy by lowering of welding temperature

The effect of welding temperature on thermal stability of friction-stir welded (FSWed) 2519 aluminum alloy was investigated. A lowering of the welding temperature below the particle dissolution threshold was shown to be a very effective way for suppression of abnormal grain growth during post-weld solution treatment. This effect was attributed to a prevention of the welded material from precipitation of fine dispersoids during subsequent...