Abstract: A183Y10Ni7 alloy is denucleated within a special inorganic salt on the electromagnetic levitation melting set-up. Large undercoolings up to 78.1℃ are achieved. The crystal nucleation and solidification microstructures of the undercooled melt are examined by the differential scanning calorimetry and common micrography. The experimental results show that the suitably composition of inorganic salt has a good denucleating effect on Al Y Ni alloys under the condition of forced melt convection and makes the microstructures of the alloy get fine apparently. And the refinement effect of the undercooled melt only depends on the undercoolings before the crystal nucleations take place without limitation of melt volume.

Key words: aluminum alloy, denucleation, high undercooling, electromagnetic levitation melting