Materials Transactions Online

Materials Transactions, Vol.47 No.09 (2006) pp.2444-2447
© 2006 The Japan Institute of Metals

Fatigue Property of Ti-5Al-13Ta Alloy Dental Castings in 0.9% NaCl Solution

Hisashi Doi1, Takayuki Yoneyama1,2, Equo Kobayashi1 and Takao Hanawa1

1Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo 101-0062, Japan
2Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan

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.

(Received 2006/5/18; Accepted 2006/7/21; Published 2006/9/15)

Keywords: titanium-5aluminium-13tantalum alloy, titanium alloy, dental casting, fatigue property, corrosion fatigue property

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