Effect of semisolid microstructure on solidified phase content in 1xxx Al alloys

Abstract Melt-spun high purity Al–0.3 wt% Fe–0.1 wt% Si alloys, containing V and Al–5Ti–1B grain refiner, were melted at 2 K/min from 635°C to different temperatures above the solidus in a differential scanning calorimeter (DSC). Quenched and slow cooled (at 2 K/min) microstructures were examined using scanning electron microscopy (SEM). Melting was observed in a hot-stage reflected light microscope. Al–Fe4Al13 melted first, forming cell boundary liquid films. Rapid coarsening occurred at