“…Strength improvement is mainly provided through the formation of Al3Sc nano-scale dispersoid particles [8,9]. These dispersoids form during elevated temperature heat treatments, typically 300-400 °C, are very fine and uniformly distributed and provide strength through four main mechanisms: 1) Solid solution strengthening, 2) precipitation hardening, 3) grain structure control though inhibiting recrystallization, 4) potentially assisting nucleation of other strengthening phases [10,11]. While Al3Sc dispersoids are stable up to temperatures of 300 o C, the high temperature coarsening resistance of Sc can be further improved though the addition of Zirconium (Zr).…”