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Development of microstracture on increasing fatigue toughness of dental Ag-Pd-Cu-Au alloy

提高牙科Ag-Pd-Cu-Au合金疲劳韧性的显微组织的开发

基本信息

批准号：
11671965
负责人：
FUKUI Hisao
金额：
$ 2.24万
依托单位：
Aichi-Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11671965/
关键词：
Ag-Pd-Cu-Au alloy microstracture fracture toughness Fatigue 組織制御

项目摘要

A fatigue test was carried out on heat-treated dental Ag-Pd-Cu-Au alloys in air. The effect of microstracture on fatigue characteristics was investigated. In the water quenched alloys, the fatigue strength increasing solutionizing temperature in the low-cycle fatigue region. While the fatigue strength decreased with increasing solutionizing temperature in the high-cycle fatigue region.In aged alloys, the fatigue strength increased due to precipitation strengthening caused by the precipitation of B phase in the low-cycle fatigue region, while the fatigue strength markedly decreased due to the precipitated B phase, which let to a fracture site in the high-cycle fatigue regions.The fracture touness of Ag-Pd-Cu-Au alloy increased with the increasing diameter of precipitated B phase in under aged conditions when volume fraction of precipitated B phase is constant. The fracture toughness increases with increasing width of slip area observed on the side surface of the specimen. The fracture toughness increased with the degree of crack deflection.The fatigue strength of alloy with a large volume fraction of al phase was excellent due to the work hardening of a1 phase in the high-cycle fatigue region. However, the volume fraction of the B phase should be taken into account in order to improve the absolute value of fatigue strength.

对经过热处理的牙科用Ag-Pd-Cu-Au合金进行了空气疲劳试验。研究了微结构对疲劳性能的影响。水淬合金在低周疲劳区溶化温度升高，疲劳强度升高。在高周疲劳区，随着固溶温度的升高，疲劳强度降低。时效合金在低周疲劳区B相的析出强化使其疲劳强度提高，而在高周疲劳区B相的析出使其疲劳强度显著降低。当析出B相体积分数一定时，时效条件下Ag-Pd-Cu-Au合金的断裂韧性随析出B相直径的增大而增大。断裂韧性随试样侧面滑移区宽度的增大而增大。断裂韧性随裂纹偏转程度增大而增大。al相体积分数大的合金由于在高周疲劳区a1相的加工硬化而具有优异的疲劳强度。但为了提高疲劳强度的绝对值，应考虑到B相的体积分数。