Abstract
The complex precipitation mechanisms related to the age-hardening of Cu-free Au-Ag-Pt-Zn-In alloy for multipurpose dental use was studied by means of hardness test, X-ray diffraction (XRD) studies, field emission scanning electron microscopic (FE-SEM) observations, energy dispersive spectrometer (EDS) analysis, and electron probe microanalysis (EPMA). The early diffusion and then clustering of the In-concentrated phase in the grain interior, together with the early diffusion and then ordering of the PtZn phase in the grain boundary, introduced the internal strains in the Au-Ag-rich α1 matrix, resulting in the hardening process. As the Au-Ag-rich α ’1 and PtZn β lamellarforming grain boundary reaction progressed, the phase boundaries between the solute-depleted face-centered cubic (FCC) α ’1 matrix and the face-centered tetragonal (FCT) PtZn β precipitate reduced, resulting in softening. In the particlelike structures composed of the major Pt-Au-rich α2 phase and the minor Pt-Zn-rich α3 phase, the separation of In and Zn progressed producing the In-increased Pt-Au-rich α ’2 phase and the Zn-increased PtZn α3′ phase with aging time without restraining the softening. The miscibility limit by complex systems of Au-Pt, Ag-Pt, Au-In and In-Zn resulted in the phase transformation and related microstructural changes.
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Mi-Gyoung Park Ph.D. is currently working on research of dental gold and alternative alloys at Catholic University of Pusan in South Korea.
Yong Hoon Kwon is associate professor of Department of Dental Materials at Pusan National University in South Korea, Ph.D. in 1997.
Hyung-Il Kim is chairman of Department of Dental Materials at Pusan National University in South Korea, Ph.D. in 1989. On the editorial board of Dental Materials Journal (International Journal published by the Japanese Society for Dental Materials and Devices). Hyo-Joung Seol* is assistant professor of Department of Dental Materials at Pusan National University in South Korea, Ph.D. in 2003. Her research focused on characterization of the agehardening mechanism of dental alloys.
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Park, JH., Cho, MH., Park, MG. et al. Age-hardening by grain interior and grain boundary precipitation in an Au-Ag-Pt-Zn-In alloy for multipurpose dental use. Gold Bull 43, 316–323 (2010). https://doi.org/10.1007/BF03215001
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DOI: https://doi.org/10.1007/BF03215001