Investigation of the temperature limits of polymorphous transformation in $\mathrm{Zr}-1\%\mathrm{Nb}$ alloy under different thermal conditions

The method of pulsed resistive heating is used to investigate the structural transformation in low-alloy zirconium. The dependence of the transformation temperature on the direction of the process is revealed: in the cooling stage, the transformation occurs at lower temperatures than in the case of heating the sample. Experiments are performed which involve the interruption of heating in the region of two-phase state. A delay of return to the low-temperature phase is revealed, which leads to a temperature drop immediately after the heating current is switched off, irrespective of the completion of the process of structural transformation.