Characterization of titanium and its delayed fracture in vivo
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- ASAOKA Kenzo
- Department of Biomaterials & Bioengineering, The University of Tokushima Graduate School Institute of Health Biosciences
Bibliographic Information
- Other Title
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- チタンのキャラクタリゼーションと生体内での遅れ破壊
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Description
Delayed fracture of medical Ti devices was studied by micro-mechanics. Effects of oxygen and hydrogen on the characterization of titanium were discussed in terms of macro and microscopic aspects. Hydrogen can have a major effect on the microstructure and properties of Ti. When the hydrogen concentration exceeds the terminal hydrogen solubility, a titanium hydride phase (TiH₂) can begin to form. Transformation from α-Ti to the hydride phase results in a volume expansion. Hydrides are formed along the grain boundary deeply in the surface. Micro-cracks are formed on the hydrides when an external force is applied. The cracks are developed and accelerate by the mechanism of stress-corrosion cracking related to hydrogen. Experimentally, we confirmed this by fatigue tests of pure Ti and by delayed fracture tests under sustained tensile loading in fluoride ion solutions. The results indicate that stress-corrosion cracking is an effective factor in delayed fracture of Ti.
Journal
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- The Journal of the Japanese Society for Dental Materials and Devices
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The Journal of the Japanese Society for Dental Materials and Devices 26 (4), 334-339, 2007
The Japanese Society for Dental Materials and Devices
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Keywords
Details 詳細情報について
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- CRID
- 1390001204211712256
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- NII Article ID
- 110006368653
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- NII Book ID
- AN00127279
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- ISSN
- 21884188
- 02865858
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed