Abstract
In dental nonprecious cast alloys, microstructure of Ni-base cast alloys and the effect of additional elements were discussed in this article, Part 1.As a result, intermetallic compound of NiMn formed between interdendritic regions of Ni-Mn binary alloys and the secondary arm length of dendritite structure distributed in the range of 30 to 50 μm.In case of Ni-Cu-Mn ternary alloy which was substituted by Cu atom in binary alloy, both eutectic αCu-Mn and intermetallic compound NiMn were found between interdendritic regions.When additional elements of Ag, Sn and Al were added to the Ni-Cu-Mn alloys, the formations of eutectic Ag-Cu and intermetallic compounds as Ni3Sn and Mn3Sn were observed for the Ni-Cu-Mn alloys which were respectively composing of Ag and Sn atoms.On the contrary, the Ni-Cu-Mn ternary alloys Al atoms constituted single dendrite structure which had intermetallic compound Ni3Al partly.Namely, it was clarified that the Ni-Cu-Mn alloys which substituted Sn and Al atoms had small-sized dendrite structure with secondary arm length of about 2.5 to 5.0 μm which was less than those of Ni-Mn and Ni-Cu-Mn alloys.
