Fine structure and mechanical properties of the shape-memory Ni$_{50}$Ti$_{32}$Hf$_{18}$ alloy rapidly quenched by spinning

We have reported the results of investigations of the structure and chemical and phase compositions of the amorphous Ni$_{50}$Ti$_{32}$Hf$_{18}$ alloy prepared by rapid quenching from melt by spinning and subjected to heat treatments. The specific features of the fine polycrystalline alloy structure formation depending on the heat-treatment mode have been studied by transmission and scanning electron microscopy, chemical microanalysis, electron diffraction, and X-ray diffraction analysis. According to the data on the temperature behavior of electrical resistivity, critical temperatures of devitrification and subsequent thermoelastic martensitic transformation $B2\to B19'$ have been determined. The mechanical properties in different heat-treatment modes have been investigated.