Structure and properties of alloys of the Al−Mn system quenched from the liquid state

Conclusions

• 1. An increase in cooling rate during granule crystallization for the alloy system Al−Mn to 10⁵ deg/sec makes it possible to move the boundary for anomalous supersaturation of manganese solid solution in aluminum in the direction of greater manganese concentration. Thus, at a cooling rate of 10⁴ deg/sec in a solid solution there is 5% Mn, and at a cooling rate of 10⁵ deg/sec, there is 61% Mn.

• 2. The possibility of further increasing solid solution supersaturation provides an additional strengthening effect during its decomposition and an increase in strength properties for semifinished products made at room and elevated temperature. However, the maximum strengthening during decomposition moves in the direction of lower heating temperature, and solid solution decomposition proceeds more rapidly. Therefore, in order to obtain the maximum properties for semifinished products granule deformation should be carried out at the lowest possible temperature.