Transformation Behavior in a Thermomechanically Cycled TiNiCu Alloy

摘要

The effect of thermomechanical cycling under 150 MPa on the transformation behavior in a TiNi_(40)Cu_(10) (at pct) alloy annealed at different temperatures was investigated using electrical resistivity measurements and differential scanning dalorimetry (DSC). It was found that thermomechanical cycling to failure could increase or decrease the transformation temperature for specimens annealed below or above the recrystallization temperature, respectively, but there was no obvious change of the transformation temperature for specimens annealed at the recrystallization temperature. The DSC and electrical -resistance experiments show that the B2 mutually impiles B 19 and B 19 mutually impiles B 19' two-stage transformations occurred n cold-worked and thermomechanically cycled specimens and that the electrical-resistance change due to the B2 -> B 19 transformation is larger than that of annealed specimens.