Peculiarities of Physico-Chemical Interaction Between Aluminum and Some Transition Metals

The main peculiar feature of transition metals (TM) in Aluminum (Al)-based alloys is the formation of supersaturated solid solutions during solidification. The high structural and phase stability of binary Al-TM alloys, which is probably connected with the very low diffusion coefficients of the elements in Al, makes the alloys promising for investigation. Wrought Al alloys are clearly divided into two groups: thermally non-hardening alloys and thermally hardening alloys, example, those subjected to quenching and aging accompanied by precipitation hardening. Manganese (Mn) and Al form a eutectic phase diagram with the invariant equilibrium temperature of 665°C and the limit solubility 1.8" Mn. Chromium (Cr) and Al form a peritectic phase diagram with the three-phase equilibrium temperature of 661°C and the CrAl₃ phase in equilibrium with the Al-based solid solution. Zirconium (Zr) and Al form a peritectic diagram with the invariant equilibrium temperature of 663°C, the ZrAl₃ phase with a tetragonal crystal lattice being in equilibrium with the Al solid solution.