| Load Dependence of Nanohardness in Nitrogen Ion Implanted Ti6AI4V Alloy and Fractal Characterization |
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| 作者姓名： | LUO Yong GE Shi-rong |
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| 作者单位： | [1]Institute of Trlbology and Rehability Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008, China [2]School of Mechanical and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008, China |
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| 基金项目： | Projects 2007CB607605 supported by the Major State Basic Research and Development Program of China; 50535050, 50225519, 50405042 by the National Natural Science Foundation of China and 2005B032 by the Science Foundation of China University of Mining and Technology. |
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| 摘 要： | Three different nitrogen ion doses were implanted into a Ti6A14V alloy to improve its mechanical surface properties for the application of artificial joints. The titanium nitride phase and nitrogen element distribution profile were characterized with X-ray photoelectron spectroscopy （XPS）. Nano-indentation tests were carried out on the surface of the Ti6A14V alloy and implanted samples on a large scale of applied loads. The XPS analysis results indicate that nitrogen diffuses into the titanium alloy and forms a hard TiN layer on the Ti6A14V alloy. The nanohardness results reveal that nitrogen ion implantation effectively enhances the surface hardness of Ti6A14V. In addition, the nanohardness clearly reveals load dependence over a large segment of the applied loads. Thus a concept of nanohardness fractal dimension is first proposed and the dual fractal model can effectively describe nonlinear deformation in indentation areas on the Ti6A14V surface. The fractal dimension shows a decreased trend in two regions of applied loads, indicating a decrease of the self-similarity complexity in surface indentation owing to an increase in nanohardness after nitrogen ion implantation.
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| 关 键 词： | Ti6AI4V合金 氮离子植入 纳米技术 硬度 |
| 收稿时间： | 19 October 2006 |
| 修稿时间： | 2006-10-19 |
Load Dependence of Nanohardness in Nitrogen Ion Implanted Ti6AI4V Alloy and Fractal Characterization |
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| LUO Yong GE Shi-rong.Load Dependence of Nanohardness in Nitrogen Ion Implanted Ti6AI4V Alloy and Fractal Characterization[J].Journal of China University of Mining and Technology,2007,17(3):363-367. |
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| Authors: | LUO Yong GE Shi-rong |
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| Affiliation: | 1. Institute of Tribology and Reliability Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;2. School of Mechanical and Electrical Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China |
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| Abstract: | Three different nitrogen ion doses were implanted into a Ti6Al4V alloy to improve its mechanical surface properties for the application of artificial joints. The titanium nitride phase and nitrogen element distribution profile were characterized with X-ray photoelectron spectroscopy (XPS). Nano-indentation tests were carried out on the surface of the Ti6Al4V alloy and implanted samples on a large scale of applied loads. The XPS analysis results indicate that nitrogen diffuses into the titanium alloy and forms a hard TiN layer on the Ti6Al4V alloy. The nanohardness results reveal that nitrogen ion implantation effectively enhances the surface hardness of Ti6Al4V. In addition, the nanohardness clearly reveals load dependence over a large segment of the applied loads. Thus a concept of nanohardness fractal dimension is first proposed and the dual fractal model can effectively describe nonlinear deformation in indentation areas on the Ti6Al4V surface. The fractal dimension shows a decreased trend in two regions of applied loads, indicating a decrease of the self-similarity complexity in surface indentation owing to an increase in nanohardness after nitrogen ion implantation. |
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| Keywords: | nanohardness nano-indentation ion implantation |
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