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Effects of Heat Treatments on Mechanical Strength of laser-welded Equi-atomic AuCu-6at%Ga Alloy

Department of Fixed Prosthodontics, Nagasaki University, School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan

J. Liu

Department of Fixed Prosthodontics, Nagasaki University, School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan

M. Atsuta

Department of Fixed Prosthodontics, Nagasaki University, School of Dentistry, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan, w-ikuya{at}net.nagasaki-u.ac.jp

There is little information available on the mechanical strengthening of laser-welded gold alloys to achieve reliable dental prostheses. This study examined the hypothesis that heat treatments increase the mechanical strength of a laser-welded equi-atomic AuCu-6at%Ga alloy with age "hardenability" at intra-oral temperature. Cut cast gold alloy plates were laser-welded. The specimens were given one of three heat treatments: (1) solution treatment, (2) high-temperature aging after solution treatment, and (3) simulated intra-oral aging after solution treatment. As-cast and uncut specimens were also prepared. Tensile testing was conducted, and the breaking stress and yield strength were recorded. The yield strength values of all the heat-treated specimens nearly reached the values of the corresponding heat-treated control specimens. The results of this study indicated that, for high mechanical strength to be achieved, the laser-welded alloy tested should be aged at a high temperature or be intraorally aged after being laser-welded.

Key Words: gold alloy • laser welding • joint strength • penetration depth.

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Journal of Dental Research, Vol. 80, No. 9, 1813-1817 (2001)
DOI: 10.1177/00220345010800090801


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