Abstract
The evolution of microstructure in the bulk of a massive Ti49Ni51 single crystal has been studied above the start temperature of martensitic transformations (MT) B2→R and B2→B19' (TR and Ms, correspondingly). The intermediate shear of a first type (ISS-1) forms as a result of the second kind phase transformation. It is characterized by the appearance of transverse atomic displacement waves with incommensurate wave vectors Q 1 =(1/3±δ) 2π/a and q 1 =(1/3±δ) 2π/a in the parent crystal lattice within the temperature range 55 degrees before TR. ISS-1 becomes a commensurate phase at cooling and 25 degrees before TR. The stretched diffuse extra-reflections of (1/2±δ) type appear on (110)* B2 neutron diffraction patterns before the beginning of MT B2→B19' (Ms = 180 K) at cooling of samples below 420 K. It is caused by the development of a short-range order and the long-range order of transverse atomic displacement waves with incommensurate wave vectors (q 2 =(1/2±δ 2π/a. In this case atomic displacement waves with q' 1 and q 1 are also developing but it is observed at more lower temperatures
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