2006 Volume 47 Issue 9 Pages 2444-2447
The purpose of this study was to evaluate the fatigue property of Ti-5Al-13Ta alloy castings for dental application since dental prostheses are used under repetitive stress condition. Dumbbell-shaped cast specimens were prepared with a centrifugal casting machine and a magnesia-based mold material. Fatigue test was performed at 310 K in 0.9% NaCl solution under repetitive loading condition with the maximum cycles at 107. As a result, fatigue limit of Ti-5Al-13Ta alloy castings in NaCl solution was about 220 MPa, which was higher than those of CP-Ti, Ti-6Al-4V and Ti-6Al-7Nb alloys, previously reported. Clear striation was observed at the crack propagation area on the fracture surface. The ratio of fatigue limit to UTS was suggested to be 30% for Ti-5Al-13Ta alloy castings; this value was higher than those for Ti-6Al-4V and Ti-6Al-7Nb alloys. It was concluded that Ti-5Al-13Ta alloy castings showed good fatigue property in 0.9% NaCl solution as an α+β high-strength titanium alloy for dental prostheses.