Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Effect of nanostructure on the Ti Grade2 properties

Halina Garbacz

nr katalogowy: 52793

Titanium is the metal of choice for the fabrication of dental and orthopedic implants due to its excellent biocompatibility and high corrosion resistance to physiological environment. However, commercially pure titanium exhibit low strength and wear resistance, which is related to low hardness. Mechanical properties of the bulk material can be ameliorated by several hardening mechanisms, e.g. solid solution (alloying), dispersion strengthening, grain refinement. Ti6Al4V represents one of the most common α+β alloys [1]. However, its drawback could arise from the alloying elements with toxic effects. Vanadium ions are classified as toxic [2], inhibit enzymes or can interact with intercellular components [3]. To overcome these concerns, the toxic V was substituted by inert Nb to create the alloy Ti6Al7Nb [4] similar to or with even slightly better properties than Ti6Al4V. High strength of metallic implants without using alloying elements can be achieved by grain refinement of titanium as the Hall-Petch relation predicts, what was experimentally proven [5÷7]. Severe plastic deformation (SPD) processing aims to get microstructural refinement to a level not achievable with traditional processing [8÷10]. Hydrostatic extrusion is one of the SPD methods, which allows to obtain a significant grain refinement, down to the nanometric scale. This method is developed in collaboration between the Warsaw University of Technology and Institute of High Pressure Physics, Polish Academy of Sciences in Warsaw. In comparison to the standard SPD methods, the hydrostatic extrusion (HE), as a method of grain refinement, usually requires a significant smaller total strain [11]. A number of commercially pure metals and alloys have been processed by HE at ambient temperature to evaluate the potential of this method for achieving grain size refinement. For pure metals, the highest degree of grain size refinement was achieved in the case of titan[...]

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2010-3

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