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Impact of ruthenium on microstructure and corrosion behavior of β-type Ti–Nb–Ru alloys for biomedical applications
https://orcid.org/0000-0001-8008-3536
Highlights Ti–20Nb–xRu alloys (x =0.0, 0.5, 1.0, 1.5at.%) were investigated. Microstructure, hardness and corrosion properties are presented. Ru addition increases noble nature of alloys. Ru stabilizes the BCC β phase and reduces precipitation of the ω phase. Elemental segregation of Ti and Nb also decreases with increasing Ru addition.
Abstract Corrosion behavior and microstructure of as-cast metastable β-type Ti–20Nb–xRu (x =0, 0.5, 1.0, 1.5at.%) have been investigated using linear polarization and transmission electron microscopy (TEM), respectively. Ruthenium (Ru) was confirmed to be a β-phase stabilizer as a titanium (Ti) alloying element which served to suppress both ω precipitation and elemental segregation; the prominence and degree of elemental segregation between the Nb-rich primary dendrites and the interdendritic areas rapidly decreased with minor Ru addition, yielding a more homogenous microstructure overall. Additionally, even minimal Ru additions significantly altered the corrosion potential (E corr), yielding a 0.3V shift in the noble direction over the Ru-free controls, along with a comparable shift in the potential at which the initial passive region begins to fail (E inc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.
Impact of ruthenium on microstructure and corrosion behavior of β-type Ti–Nb–Ru alloys for biomedical applications
https://orcid.org/0000-0001-8008-3536
Highlights Ti–20Nb–xRu alloys (x =0.0, 0.5, 1.0, 1.5at.%) were investigated. Microstructure, hardness and corrosion properties are presented. Ru addition increases noble nature of alloys. Ru stabilizes the BCC β phase and reduces precipitation of the ω phase. Elemental segregation of Ti and Nb also decreases with increasing Ru addition.
Abstract Corrosion behavior and microstructure of as-cast metastable β-type Ti–20Nb–xRu (x =0, 0.5, 1.0, 1.5at.%) have been investigated using linear polarization and transmission electron microscopy (TEM), respectively. Ruthenium (Ru) was confirmed to be a β-phase stabilizer as a titanium (Ti) alloying element which served to suppress both ω precipitation and elemental segregation; the prominence and degree of elemental segregation between the Nb-rich primary dendrites and the interdendritic areas rapidly decreased with minor Ru addition, yielding a more homogenous microstructure overall. Additionally, even minimal Ru additions significantly altered the corrosion potential (E corr), yielding a 0.3V shift in the noble direction over the Ru-free controls, along with a comparable shift in the potential at which the initial passive region begins to fail (E inc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.
Impact of ruthenium on microstructure and corrosion behavior of β-type Ti–Nb–Ru alloys for biomedical applications
https://orcid.org/0000-0001-8008-3536
Highlights Ti–20Nb–xRu alloys (x =0.0, 0.5, 1.0, 1.5at.%) were investigated. Microstructure, hardness and corrosion properties are presented. Ru addition increases noble nature of alloys. Ru stabilizes the BCC β phase and reduces precipitation of the ω phase. Elemental segregation of Ti and Nb also decreases with increasing Ru addition.
Abstract Corrosion behavior and microstructure of as-cast metastable β-type Ti–20Nb–xRu (x =0, 0.5, 1.0, 1.5at.%) have been investigated using linear polarization and transmission electron microscopy (TEM), respectively. Ruthenium (Ru) was confirmed to be a β-phase stabilizer as a titanium (Ti) alloying element which served to suppress both ω precipitation and elemental segregation; the prominence and degree of elemental segregation between the Nb-rich primary dendrites and the interdendritic areas rapidly decreased with minor Ru addition, yielding a more homogenous microstructure overall. Additionally, even minimal Ru additions significantly altered the corrosion potential (E corr), yielding a 0.3V shift in the noble direction over the Ru-free controls, along with a comparable shift in the potential at which the initial passive region begins to fail (E inc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.
Impact of ruthenium on microstructure and corrosion behavior of β-type Ti–Nb–Ru alloys for biomedical applications
Biesiekierski, Arne (author) / Ping, D.H. (author) / Yamabe-Mitarai, Y. (author) / Wen, Cuie (author)
2014-02-27
7 pages
Article (Journal)
Electronic Resource
English
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