Precipitation hardening in a dental low-gold alloy.
Age-hardening characteristics in a dental low-gold alloy composed of 40.0 wt% Au-35.0 wt% Ag-7.9 wt% Pd-7.0 wt% Cu-5.0 wt% In-3.5 wt% Zn-1.5 wt% Sn, were investigated by means of the hardness test, XRD study, SEM observations and EPMA. The following results were obtained. The age-hardening was characterized by a precipitation of Cu-rich alpha2 phase in the a phase. The softening that occurred following prolonged ageing was due to the heterogeneous formation of the fine nodular precipitates composed of the Ag-rich alpha1 phase and the Cu-rich alpha2 phase at the grain boundaries of the a phase.
Kim
Hyung-Il
HI
Department of Dental Materials, College of Dentistry, Pusan National University, 1-10 Ami-dong, Seo-gu, Pusan 602-739, Korea.
Park
Young-Hwan
YH
Lee
Hee-Kyung
HK
Seol
Hyo-Joung
HJ
Shiraishi
Takanobu
T
Hisatsune
Kunihiro
K
D055598:Chemical Phenomena; D011232:Chemical Precipitation; D002627:Chemistry, Physical; D003734:Dental Casting Investment / Q000737:chemistry*; D006047:Gold Alloys / Q000737:chemistry*; D006244:Hardness; D008422:Materials Testing; D008669:Metallurgy; D013997:Time Factors; D014961:X-Ray Diffraction
D003734:Dental Casting Investment; D006047:Gold Alloys