Ti6Al7Nb alaşımının yorulma davranışı

Cıngı, Mehmet; ÇımenoĞlu, Hüseyin
April 2010
ITU Journal Series D: Engineering;Apr2010, Vol. 9 Issue 2, p163
Academic Journal
Extended abstract Musculoskeletal system diseases cost in the countries around the globe a significant amount of money annually. The occurrence of bone fractures has also increased due to an increase of the number of traffic accidents and the increase of life expectancy almost twice as compared with past centuries. It is expected that one-third of European citizens will be soon over the age of 60. Hence, healthcare costs will be an increasing burden for society. Therefore, the need for economically feasible biomaterials for fracture healing will increase. For decades, researchers have focused on devoloping a viable and cost effective alternative materials for the dental applications instead of nickelchromium and cobalt-chromium alloys which have been popular for the denture frameworks since 1970s. Usage of alloys containing nickel was limited due to doubts related with biological safety. Titanium, which eliminates persisting doubts as to biological safety of alloys containing nickel, was introduced in the 1970s. Titanium alloys are attractive materials for many engineering applications, which require excellent combination of mechanical properties, corrosion resistance and biocompatibility along with a low weight. Their excellent corrosion resistance and biocompatibility are assumed to be due to the formation of a dense and stable TiO2 layer, which rebuilds spontaneously after being damaged, even in solutions with low oxygen contents. Unfortunately, in applications where contacting motion of counterparts is maintained, titanium and its alloys have limited usage owing to their poor tribological performance. Poor wear resistances of titanium and its alloys can be enhanced by surface modification techniques. Among the surface modification techniques, thermal oxidation is one of the simplest and cheapest process and appears as it is very promising way to produce hard surfaces on titanium and its alloys. Surface modifications like surface roughening, oxidation or coating techniques also often improve the bioadhesion and the corrosion behaviors of titanium implants. Although many types of titanium alloys are commercially available, since when compared with commercially pure titanium Ti6Al4V alloys have superior physical and mechanical properties and almost same of nickel-chromium and cobalt-chromium alloys, alfa/beta alloy Ti6Al4V is the most commonly used in the biomedical applications. Sometimes usage of Ti6Al4V alloy can be problematic due to the toxicity of vanadium in the body. In order to eliminate this negative effect of vanadium, in the 1980s new vanadium-free alloy containing niboium Ti6Al7Nb was devoloped. …


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