title: Isothermal age-hardening behaviour in a Au-1.6 wt% Ti alloy.
abstract: This study describes research with a view to developing a new age-hardenable, high-carat dental gold alloy with better biocompatibility by addition of a small quantity of titanium to gold. The relationship between isothermal age-hardening and phase transformation of the Au-1.6 wt% Ti alloy was investigated by means of hardness testing, X-ray diffraction study, scanning electron microscopic observation and energy dispersive spectroscopy. The hardening in the initial stage of ageing seemed to be attributable to the continuous precipitation of the Au4Ti ordered phase in the supersaturated alpha solid solution matrix. The overaging with softening was attributed mainly to the formation of precipitates at the grain boundaries, which grew to bright lamellae and seemed to be composed of the Au4Ti phase.
authors.affiliation: Department of Dental Materials, College of Dentistry, Pusan University, Korea.
authors.forename: H I
authors.initials: HI
authors.lastname: Kim
authors.forename: H J
authors.initials: HJ
authors.lastname: Seol
authors.forename: D H
authors.initials: DH
authors.lastname: Bae
authors.forename: J Y
authors.initials: JY
authors.lastname: Shim
authors.forename: Y
authors.initials: Y
authors.lastname: Takada
authors.forename: O
authors.initials: O
authors.lastname: Okuno
mesh_terms: D003460:Crystallization; D004055:Differential Thermal Analysis; D004577:Electron Probe Microanalysis; D006047:Gold Alloys / Q000737:chemistry*; D006244:Hardness; D006245:Hardness Tests; D006358:Hot Temperature; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D006047:Gold Alloys; D014025:Titanium