Anomalous hardening of Al-8Ca eutectic alloy due to a non-equilibrium phase state transition under laser irradiation

摘要

The relationship between the change in the structure and the hardening effect of an Al-8%Ca eutectic aluminum alloy under laser irradiation was studied. Laser surface processing of the as-cast alloy was carried out at a laser power of 370 W and a beam velocity of 750 mm/s. It is shown that laser irradiation leads to a 4-fold increase in the microhardness of the alloy (up to 3.6 GPa) due to the creation of a supersaturated solid solution of calcium in aluminum and a multiple increase in the dislocation density.