In-situ diffraction investigations of superelastic NiTi shape memory alloys with neutron and synchrotron x-ray radiation were used to examine the evolution of the phase state of the material as a function of stress and strain, respectively. The results suggest that the transition from austenite to martensite is not complete even at the end of the superelastic plateau, and that significant load transfer to residual austenite takes place.Keywords: Neutron diffraction, x-ray diffraction, evolution of phase state, residual austenite Der Phasenanteil in superelastischen NiTi Formgedächtnislegie-rungen als Funktion von Spannung und Dehnung wurde mittels Neutronen-und Röntgen-Diffraktometrie in-situ untersucht. Die Ergebnisse deuten darauf hin, dass die Umwandlung von Austenit zu Martensit selbst am Ende des superelastischen Plateaus nicht vollständig abgeschlossen ist, und dass ein deutlicher Lasttransfer auf den residuellen Austenit stattfindet.
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