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J Dent Res 52(1): 151-156, 1973
© 1973 International and American Associations for Dental Research
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A New Dental Superalloy System: III. Microstructure and Phase Transformations

HAMDI MOHAMMED 1, KAMAL ASGAR 1, and W. C. Bigelow 1

1 University of Michigan, Ann Arbor, Michigan 48104, USA

A microstructural study was conducted on 15 cobalt-chromium-nickel alloys of the basic composition 40 Co-30 Ni-30 Cr. The alloys were strengthened by the addition of tantalum and tantalum-rich regions were found at the interdendritic spaces. The increase in Ta concentration caused a decrease in the concentration of the beta phase and an increase in the amounts of the agr phase. Excessive amounts of Ta resulted in formation of the sgr phase. The failure of the alloy occurred as a result of the interconnection of sgr regions.

Submitted on May 14, 1972






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