Analysis of corrosion fatigue for commercially pure titanium using nitrogen ion implantation
The objective of this research is to determine the corrosion fatigue behaviours for commercially pure titanium (CpTi) using nitrogen ion implantation. A series of studies was conducted to obtain the mechanical properties, corrosion resistance and fatigue and corrosion fatigue behaviours and to...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1217/1/24p%20NURDIN%20ALI.pdf http://eprints.uthm.edu.my/1217/2/NURDIN%20ALI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1217/3/NURDIN%20ALI%20WATERMARK.pdf http://eprints.uthm.edu.my/1217/ |
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| Summary: | The objective of this research is to determine the corrosion fatigue behaviours for
commercially pure titanium (CpTi) using nitrogen ion implantation. A series of
studies was conducted to obtain the mechanical properties, corrosion resistance and
fatigue and corrosion fatigue behaviours and to develop model prediction of
corrosion fatigue life of nitrogen ion implanted CpTi (Nii-Ti). Initially, nine
specimens of CpTi were implanted nitrogen ion with the energy of 80, 100 and 115
keV and dose of 0.5x1017, 1.0x1017 and 2.0x1017ions/cm2
to characterize its surface
properties and to obtain corrosion resistance. The result shows that energy of 100
keV and dose of 2.0x1017ions/cm2 was the optimal implanted parameter. In the
second study, fatigue and corrosion fatigue test were performed to investigate the
fatigue and corrosion fatigue behaviours. The fatigue specimens were implanted with
the energy of 100 keV and dose of 2.0x1017ions/cm2
. The fatigue tests were carried
out for Nii-Ti specimens in saline solution and for CpTi and Nii-Ti specimens in
laboratory air by means of axial loading condition at stress level between 240 and
320 MPa. The results were nitrogen ion implantation improved slightly the fatigue
life of CpTi and Nii-Ti with the fatigue strength of 250 MPa and 260 MPa,
respectively. Finally, the prediction of corrosion fatigue life was developed based on
corrosion pit growth law. The stress amplitudes of 250, 260 and 280 MPa were
selected to measure penetration rate of specimens at various elapsed times using
electrochemical method in saline solution, then established the empirical model. The
result shows that the expression fits the experimental data well. In conclusion, the
effects of nitrogen ion implantation on surface properties and adhesion strength of
nitride layers improved the fatigue and corrosion fatigue life of Nii-Ti. |
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