Microstructure‐texture‐fracture toughness property correlation in annealed Al‐6Mg alloy with minor scandium and zirconium additions

Abstract

The effect of minor addition of scandium and zirconium on the fracture toughness (FT) behaviour of aluminium‐6 wt% magnesium alloy is studied. Texture measurement and transmission electron microscopy have revealed that the evolution of texture in cast alloys after annealing is decided by the morphology and character of the precipitates. It is further demonstrated that the said minor addition influences the FT behaviour of Al‐6Mg alloy by manipulating in‐plane anisotropy as decided by the precipitate morphology. Textural situation in annealed state has also been related to the FT behaviour.

Precipitation and Softening Behaviour of Cast, Cold Rolled and Hot Rolling Prior to Cold Rolled Al-6mg Alloy Annealed at High Temperature

“…9) fine dispersoids with different morphologies. The Chinese script like intermetallics is reportedly ά-AlFeSi phase; the elongated needle shaped particles are β-AlFeSi and or AlFe phase having monoclinic crystal structure of low symmetry 10 . These crystals show specific habit and act as local stress raisers.…”