THERMOMECHANICAL BEHAVIOR OF TINI WIRES DURING THERMAL CYCLING UNDER STRESS

The effect of thermal cycling was investigated in TiNi thin wires whic h were submitted to a constant stress. At first, the strain evolution of the martensitic and austenitic phases is studied. The influences of the number of thermal cycles and of the applied stress are determined . The second purpose of this paper is the transformation evolution of the TiNi alloy. The measurement df the transformation temperatures and enthlapies after working was carried out by differential scanning cal orimeter. The effects of the stress and of the annealed temperature ar e described.