Abstract
	Intermetallic compound containing approx. 50 at. % Ni and 50 at. % Ti is considered as standard shape memory alloy. The basic requirement to metallurgy of these advanced materials is strict adherence to chemical composition of the alloy, which is the main condition for obtaining of the alloy with the required transformation temperatures. Ni-Ti based alloys are usually melted at the temperature of approx. 1500 °C. For obtaining of wire it is best to use technology of swagging in combination with subsequent drawing. Alloys with shape memory effect have generally several variants of shape memory behaviour. Generally speaking these are pseudo-elasticity, shape memory phenomenon (irreversible), reversible shape memory phenomenon and all-round shape memory effect. It is possible to measure transformation temperatures by deformation methods, by DSC method (differential scanning calorimetry) or DTA method (differential thermal analysis), by resistometric methods. Resistometric method enables simple, precise and rapid evaluation of transformation temperatures. In dependence on constitution of alloys, or additional alloying or heat treatment or mechanical treatment, it is possible to get different types of dependence of electric resistivity on temperature. The dilatometric method utilises either transformation strains or thermal strains; the basic data generated are in the form of curves of dimension against time and temperature. Experimental alloy was prepared in vacuum induction furnace and then forged and heat treated. This article deals with measurement of transformation temperatures of Ni-Ti shape memory alloys by resistometric and dilatometric method and gives their comparison.