CALPHAD-informed phase-field modeling of grain boundary microchemistry and precipitation in high strength Al-Zn-Mg-Cu alloys
CALPHAD-informed phase field modeling, scanning transmission electron microscopy and atom probe tomography have been used to study the segregation, precipitation, and solute distribution in high strength Aluminium alloys (7xxx).
High strength Aluminium alloys (7xxx series) are important materials for a sustainable future, enabling weight reduction of electrical (and conventional) vehicles.
At the internal interfaces their advantage, i.e. their complex precipitation system, turns into a disadvantage, leaving large precipitation free zones around the grain boundaries. This creates high mechanical contrast and galvanic elements, obviously undesirable features.
In a recent collaboration we studied the segregation, precipitation, and solute distribution in these systems using CALPHAD-informed phase-field modeling, scanning transmission electron microscopy and atom probe tomography.