The study deals with metastable Al-Cu (0-53% Cu) and Al-Si (0-40% Si)
systems and includes experimental plotting of vertical sections of con
centration-structure diagrams parallel to Cph (average content of allo
ying elements in phases) and K (alloying element content in alloy) axe
s at a constant rate of cooling (10(2) K/s) on solidification.