Change in Mechanical Properties of Biomechanical Ti-12Cr Subjected to Heat Treatment and Surface Modification Processing
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- Niwa Kentaro
- Graduate School of Science and Technology, Meijo University
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- Akahori Toshikazu
- Faculty of Science and Technology, Meijo University
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- Niinomi Mitsuo
- Faculty of Science and Technology, Meijo University
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- Hattori Tomokazu
- Faculty of Science and Technology, Meijo University
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- Nakai Masaaki
- Faculty of Science and Technology, Kinki University
Bibliographic Information
- Other Title
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- 熱処理および表面改質処理を施した生体用Ti-12Cr合金の力学的特性変化
- ネツ ショリ オヨビ ヒョウメン カイシツ ショリ オ ホドコシタ セイタイヨウ Ti-12Cr ゴウキン ノ リキガクテキ トクセイ ヘンカ
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Abstract
In recent years, metallic biomaterial applications have demanded a relatively low elastic modulus of around 30 GPa that is nearly equal to that of bone. However, in the case of spinal fixture applications, metallic materials with a relatively high Young's modulus are required to suppress spring -back by elastic and plastic deformation during implantation. Therefore, Young's modulus control by stress-induced transformation in a newly developed biomedical β-type Ti-12Cr alloy, has been proposed by the present authors. However, the relationship between the microstructure and mechanical properties of Ti-12Cr has not been fully investigated up till now.<br> Therefore, changes in the mechanical properties of Ti-12Cr were investigated through heat treatment and the fine particle bombarding process (FPB), which is a surface modification process used in this study. Peak aging of Ti-12Cr heated at 673 K showed for around 2.4 ks.<br> The Vickers hardness of Ti-12Cr in the peak aging condition (PA) at 673 K was around 90% (HV 524) higher than that (HV 294) in the solutionized condition (ST). Meanwhile, both the 0.2% proof stress and tensile strength of Ti-12Cr in the PA at 673 K were also around 50% higher those in the ST. However, the ductility of Ti-12Cr in the PA at each temperature reduced significantly. Therefore, a solo-solution treatment was judged to be the optimal heat treatment for Ti-12Cr with an excellent combination of strength and ductility. The Vickers hardness and Young's modulus of as-solutionized Ti-12Cr subjected to FPB increased by around 40% and 70%, respectively, at the very edge of the specimen surface, as compared to those of the unprocessed sample. Furthermore, the fatigue strength of Ti-12Cr subjected to FPB increased by around 70 MPa. The bone contact ratio of Ti-12Cr rose slightly with an increase in the implantation period from 24 to 52 weeks.<br>
Journal
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- Journal of the Japan Institute of Metals and Materials
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Journal of the Japan Institute of Metals and Materials 80 (12), 764-771, 2016
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001206482015744
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- NII Article ID
- 130005284306
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- NII Book ID
- AN00187860
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- ISSN
- 18806880
- 24337501
- 00214876
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- NDL BIB ID
- 027773218
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed