Isothermal Age-hardening Behaviour in a Multi-purpose Dental Casting Gold Alloy

概要

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The isothermal age-hardening behaviour of a multi-purpose dental casting gold alloy was investigated by means of hardness testing, X-ray diffraction study, scanning electron microscopic observations and energy dispersive spectroscopy. By ageing of the solution-treated specimen at 4OO∼50O℃, two phases of the Au-rich α_1 phase with an f.c.c. structure and the α_2 phase with an ordered f.c.c. structure based on Pt_3In were transformed into three phases of the α_1 phase, the α_2 phase and the β phase with an ordered f.c.t. structure based on PtZn. Hardening was attributed to the fine nodular precipitation resulting from the formation of the β phase in the α_1 matrix. Softening was due to the coarsening of the fine nodular precipitates as the result of consumption of the α_2 phase.
日本歯科理工学会の論文