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Microstructural characteristics and hardness of as cast Co-Cr-Ti dental alloys

Influence of adding titanium on the microstructure and hardness of as-cast cobalt- chromium base alloys have been investigated. Twelve samples of Co-Cr-Ti alloys were prepared by arc-melting technique under argon atmosphere. Using optical metallography and scanning electron microanalyser has been established that all samples have similar two-phases dendritic solidification microstructure, typical for commercial dental alloys. This microstructure consists of dendritic and interdendritic phases with the similar chemical compositions. Hardness of alloys increases close proportionally with titanium and chromium content. Microhardness of interdendritic region for representative sample is twice as high comparing with that of dendrite. A reason for this could be the difference in the crystal structure of the phases. According to the obtained results, among twelve samples of Co-Cr-Ti alloys with satisfactory microstructure, only samples 4, 5 and 6 have appropriate hardness and could be eventually applied as dental materials.

Co-Cr-Ti alloys; dental as-cast alloys; microstructure; hardness

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