USING OF ULTRASONIC METHODS FOR DETERMINATION OF THE ELASTIC MODULI ON THE Ti-Ni BASED ALLOYS

I. Szurman, R. Kocich, M. Kursa, VŠB – Technical University of Ostrava, Faculty of Metallurgy and Material Engineering, Ostrava – Poruba, Czech Republic The presented work is focused on the determination of elastic constants of selected alloys of the systems Ni-Ti and Ni-Ti-Cu with use of ultrasonic methods. Sample preparation was carried out using VIM in graphite crucible in combination with pouring into graphite mould. The prepared samples were appropriately heattreated, polished into the desired shape and subjected to measurement of density and then to ultrasonic measurements. In addition to conventional methods, such as mechanical tests, also less known methods are applied. Among the specifi c methods we can mention dynamic mechanical analysis, dynamic super microhardness measurement, electro acoustic resonance or ultrasonic test.The group of thus tested materials includes also Ti alloys.