A kind of fine equiaxed smooth grains,which is different from equiaxed dendrites in both morphology and formation mechamism,was observed in 8090 Al-Li alloy welds.

• 8090铝锂合金焊缝中存在一种细小的等轴光滑晶，其形态和形成机制与等轴树枝晶不同。