Abstract
Microstructural investigations with transmission electron microscopy were carried out on quenched Ni-Ti alloys with 52 and 54.5 at% Ni. For the Ni 52 Ti 48 specimen long time exposed diffraction patterns of a single grain show besides the expected reflections of the B2-phase, two sets of extra reflections in different zones. The first type of spots is explained by lattice displacement waves, which are regarded as precursors of the martensitic Ni-Ti phases, B 19' and R-phase, respectively. The second set of reflection with more diffuse intensity than the other reflections is related to Ni 4 Ti 3 precipitates in an early state of formation. For the Ni-richer Ni 54.5 Ti 45.5 alloy only Ni 4 Ti 3 precipitates in an early state of formation are found but no precursors of the B19'- and R-phase.
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