Microstructure change and segregation distribution in dental 32 Ni-23 Cu-25 Mn casting alloy. (Part II) Effect of chill-metal system.

Abstract

When chill-metal was used to disk-like casting specimens in low-melting Ni-Cu-Mn alloy, the following results were obtained in comparison with air-vent system: dendritic A-grain changed spherically, and the amount of B-grain increased. In case of grain-size distribution, C-grain changed to a very small-scale, but the others (A- and B-grains) showed the same change as air-vent system. In addition, the segregation distribution of Ni, Cu, Mn, Cr and Ge in individual grains was found, similarly to air-vent system.