TY - JOUR
T1 - Impact of ruthenium on microstructure and corrosion behavior of β-type Ti-Nb-Ru alloys for biomedical applications
AU - Biesiekierski, Arne
AU - Ping, D. H.
AU - Yamabe-Mitarai, Y.
AU - Wen, Cuie
N1 - Funding Information:
The authors acknowledge financial support for this research by the Australian Research Council (ARC) through the ARC Discovery Project DP110101974 .
PY - 2014/7
Y1 - 2014/7
N2 - Corrosion behavior and microstructure of as-cast metastable β-type Ti-20Nb- xRu (x= 0, 0.5, 1.0, 1.5. at.%) 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 (Ecorr), 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 (Einc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.
AB - Corrosion behavior and microstructure of as-cast metastable β-type Ti-20Nb- xRu (x= 0, 0.5, 1.0, 1.5. at.%) 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 (Ecorr), 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 (Einc). The present result suggests Ru addition can confer a greater resistance to corrosion in β-Ti alloys.
KW - Biomaterials
KW - Corrosion
KW - Microstructure
KW - Transmission electron microscopy
KW - β-Titanium alloys
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U2 - 10.1016/j.matdes.2014.02.058
DO - 10.1016/j.matdes.2014.02.058
M3 - Article
AN - SCOPUS:84897863319
SN - 0264-1275
VL - 59
SP - 303
EP - 309
JO - International Journal of Materials in Engineering Applications
JF - International Journal of Materials in Engineering Applications
ER -