Castability and Mechanical Properties of Ti-6 Al-7 Nb Alloy Dental-cast

Abstract

To collect basic data for application of Ti-6Al-7Nb alloy in dentistry, castability and mechanical properties were investigated using specimens made by usual dental casting technique. Good castability was seen when the specimen was made using a magnesia mold and a centrifugal casting machine. The alloy of Ti-6Al-7Nb showed a little bit lower strength and approximately 1.4 times greater elongation as compared with the strength and elasticity of Ti-6Al-4V alloy on tensile tests. Microstructure of the Ti-6Al-7Nb alloy exhibited a refined two-phase structure consising of an acicular alpha phase in prior-beta grains. It is considered that the strength of the of the alloy is due to this refined structure. From these results, it was concluded the alloy would be useful in conventional dental casting technique for titanium alloys.