The effect of minor additions of titanium, beryllium, gallium, rhenium and niobium on the aluminum grain size after heating and straining

Conclusions

• 1. In consequence of recrystallyzation at 500°C a coarse crystalline structure appears in sheet aluminum after a preceding 7–15% deformation.

• 2. Addition of 0.2% Ti totallly prevents the formation of coarse crystalline structure in aluminum annealed at 500°C even if previously strained up to 15%. At 0.1% Ti a coarse crystalline structure appears in aluminum strained by 15%, and at 0.05% Ti after 7% deformation.

• 3. Addition of 0.05–0.5% Be, 0.05–0.2% Nb, or 0.1–5% Ga fails to produce any noticeable effect on the size of grain after a preceding 1.5–15% deformation.

• 4. At 0.2% Re content a coarse crystalline structure is observable in aluminum only upon 15% deformation preceding the high-temperature heating, whereas smaller additions of rhenium (0.05–0.01%) fail to produce a positive influence.