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Neutron diffraction phase analysis during thermal cycling of a Ni-rich NiTi shape memory alloy using the Rietveld method

Scripta Materialia 46(7): 543-548

Autoren/Herausgeber: Sitepu H
Schmahl WW
Allafi JK
Eggeler G
Dlouhy A
Toebbens DM
Tovar M
Erschienen: 2002

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. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.