On the Influence of Thermomechanical Treatments on Shape Memory Alloys
- D. Treppmann
- E. Hornbogen
DOIAbstract
Thermomechanical treatments (TMT) are used to modify the microstructure of austenite or martensite by introducing lattice defects and / or particles of a second phase. The temperature range extends between T ≥ Md (pure ausforming) and T ≤ Mf (pure marforming). In the intermediate range (Mf<T<Md) a more complex behaviour is found. TMT are discussed in a systematic manner using NiTi-based and Cu-based alloys as examples. Transformation behaviour and mechanical properties of TM-treated alloys are compared with undeformed ones. The following effects can be observed for thermal transformation cycles : (a1) lowering or raising of transformation temperatures, (a2) widening or decreasing of hysteresis, (a3) induction of multiple step transformation...
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