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Titanium alloys are prominent as dental and orthopedic materials because of their high strength-to-weight ratio, lower elastic modulus, excellent corrosion resistance and apparent biocompatibility. Based on microstructures that can be produced by alloying, titanium alloys are grouped as alpha, alpha-beta and beta alloys. Alpha titanium and alpha-beta alloys have been used for dental and orthopedic purposes. Beta titanium alloys are being considered as candidate materials for implant applications because of their ease of formability, increased strength and lower elastic modulus, in spite of increased cost. Studies show the presence of the omega phase in the beta alloy, Ti-15Mo-2.8Nb, in the unaged condition. Comparison of corrosion behavior of this alloy with the alloy Ti-6Al-4V shows the two alloys have comparable corrosion resistance in simulated physiological solution. A review and data are presented along with a discussion of the influence of composition, heat treatment and microstructure on mechanical properties and corrosion behavior of titanium alloys, in general, and of beta alloys, in particular.
titanium, titanium alloys, beta titanium alloys, heat treatment, mechanical properties, microstructures, corrosion, implant metals
Metallurgist, Naval Research Laboratory, Washington DC,
Metallurgist, National Institute of Standards and Technology, Gaithersburg, MD