Difference in Age-hardening Mechanism in Dental Gold Alloys
- 1 March 1982
- journal article
- other
- Published by SAGE Publications in Journal of Dental Research
- Vol. 61 (3) , 473-479
- https://doi.org/10.1177/00220345820610030601
Abstract
TEM and SAED studies were conducted to clarify a difference in age-hardening mechanism with changes of gold content in Au-Cu-Ag ternary alloys, 18K, 16K, and 14K gold alloys, for which the ratio of copper to silver remained at 65 to 35 in weight. Age-hardening in the 18K alloy was attributed to the formation of the AuCu I type ordered platelets on the matrix {100}. In the 16K and 14K alloys, a periodic antiphase domain structure of the AuCu II type ordered phase made a major contribution to age-hardening. An alternating coarse lamellar structure was formed by the mechanism of discontinuous precipitation in the 16K alloy, while a modulated structure by spinodal decomposition was observed in the 14K alloy.Keywords
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