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The influence of Ti on the sequence of phase precipitation in rapidly solidified Cu-Fe-Ti alloys

Precipitation sequence and microstructure decomposition during heating of rapidly solidified Cu-Fe and Cu-Fe-Ti alloys have been investigated by the combination of four point electrical resistance measurement method, optical microscopy and scanning electron microscopy (SEM). Rapidly solidified samples, in the form of thin ribbons, were prepared by the single roll melt spun technique and heated in the protective atmosphere with constant heating rate to 800 °C. Sequence of the phase precipitation during heating were successfully followed by the in-situ electrical resistance measurement method. After recording the electrical resistivity temperature dependency in the entire temperature interval, separate samples were heated to various temperatures, slowly cooled and analyzed by scanning (SEM) electron microscopy. It was found that titanium reacts with iron and forms intermetalic phase TiFe. The microstructure transformation starts at a higher temperature than for binary Cu-Fe alloys and take place in a narrow temperature interval.

rapid solidification ; Cu alloys ; precipitation ; electrical resistance measurement

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