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Microstructure change and segregation distribution in dental 32 Ni-23 Cu-25 Mn casting alloy. (Part 1) Effect of air-vent system.

In low-melting 32 Ni-23 Cu-25 Mn alloy, the structure change and the segregation distribution were investigated in optical microscopy. The use of air-vent system to casting specimen had a notable effect to morphology and grain-size distribution, but the segregation showed the same tendency as the air-cooled specimen without air-vent system, except Cu segregated in B-grain less than in C-grain.