Effect of Large Particles in Central Band of Al–4%Mn–1%Si High-Speed Twin-Roll Cast Strip on Elongation of Cold-Rolled and Annealed Sheets

Mn-containing (2 and 4 mass%) Al–Mn-based alloys were fabricated by high-speed twin-roll casting (HSTRC). Al–4 mass%Mn–1 mass%Si strips contained coarse particles in the central band of cast strips. Microstructure chemical analyses revealed that primarily Al6(MnFe) β-Al(MnFe)Si. These formed during solidification process residual liquid, which slowly cooled after strip exited roll gap HSTRC. However, blowing compressed air onto surface as it rapidly reducing number size large region. The cold-rolled annealed sheets from exhibited a refined homogenous microstructure. Consequently, both strength elongation improved.