Thermally reversible deformation of a TiNi alloy after the end of the thermal and electrical processes induced by the B2 ? R martensitic transformations

摘要

The dilatometric measurements of a TiNi-based alloy during thermal cycling through the temperature range of the B2 ? martensitic transformations performed simultaneously with electrical resistance measurements and supplemented with differential scanning calorimetry analysis demonstrate two-stage deformation. At the first stage, thermally reversible forming is accompanied by the thermal effects and the change in the electrical resistance, which are characteristic of these transformations. At the second stage, deformation proceeds in the absence of thermal effects at an unchanged electrical resistance. This behavior is explained using the well-known two stages in the B2 ? transformation.