Abstract
In this study, TNZT-xSi ((Ti53Nb35Zr7Ta5)100-xSix, x=0, 1.4, 2.3, wt.%) alloys are prepared by powder hot extrusion. The effect of Si addition on microstructure, mechanical properties, corrosion resistance and in vitro apatite formation ability of TNZT-xSi alloys is investigated. The as-extruded TNZT alloy mainly consists of elongated BCC grains. The addition of Si leads to the precipitation of fine (Ti, Zr)2Si (S2) particles from the BCC matrix. With the increase of Si content, the volume fraction of recrystallized grains rises significantly, and the microstructure of extruded alloys tends to transform from elongated to equiaxed grains. It’s indicated that the introduction of S2 particles activates the dynamic recrystallization process during hot extrusion and results in an obvious reduction in the overall grain size. Compared with the TNZT-0Si base alloy, the tensile strength of TNZT-2.3Si alloy is improved from 726MPa to 983MPa, with the elongation declining from 28.0% to 9.5%. The TNZT-xSi alloys exhibit higher corrosion potential (Ecorr) and lower corrosion current density (Icorr) than Ti-6Al-4V alloy in simulated body fluid, due to the formation of more stable oxides such as Nb2O5, ZrO2 and Ta2O5. Furthermore, TNZT-xSi alloys have apatite formation ability superior to Ti-6Al-4V. These results suggest that TNZT-xSi alloys may have the potential as a biomaterial for implant applications.
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