Sitepu, H.; Schmahl, Wolfgang W.; Khalil-Allafi, Jafar; Eggeler, Gunther; Dlouhy, A.; Többens, D. M.; Tovar, M.
Neutron diffraction phase analysis during thermal cycling of a Ni-rich NiTi shape memory alloy using the Rietveld method.
In: Scripta Materialia, Vol. 46, No. 7: pp. 543-548
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Martensitic transformations in an aged Ni-rich NiTi shape memory alloy are analysed using neutron diffraction and electron microscopy. The material shows a two step transformation on cooling from B2. After the first release of latent heat on cooling two martensitic phases (R-phase and B19(′)) are present. This is due to a heterogeneous microstructure after solution annealing and ageing.