Abstract
The ribbons of the Ti50Ni50-xCux (x=25; 26; 28; 30; 34; 36; 38 at.%) alloy were produced by the melt-spinning technique at a cooling rate of approximately 106 °C/s. The samples were characterized by means of scanning electron microscopy, X-ray diffraction, differential scanning calorimetry. It has been revealed that at the content of copper 25-26 at.% ribbons are in the amorphous-crystalline state, while at the content of copper above 26 at.% ribbons are in the amorphous state. It has been shown, that the alloys with the copper content from 25 to 34 at.%, by heating up to 500°C at the rate of 10°C/min in calorimeter, experience massive or primary crystallization with forming the austenite B2-phase. Also by increasing the copper content there is a evident decrease in temperatures of the crystallization initiation. At a further cooling down to 0°C thermoelastic martensite transformation B2→B19, characteristic temperatures of which decrease with the increase of the copper content, are observed in such alloys. In alloys with the copper content more than 34 at.% the two separated peaks of crystallization, responsible for eutectic crystallization of the two-phase structure (B2+B11), are evident. The cooling of these alloys down to 20°C does not lead to any structural transformations.
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