In heterophase Ti50.0–xNi50.0+x (х = 0.8–1.0 at.%) single crystals after aging at 823 K for 1.5 h at the heating/cooling rate (15 ± 1) K/min and stepwise aging at 823 K for 1.5 h plus aging at 573–623 K for 1 h, multi-stage martensitic transformations are observed: there are three peaks of heat release in the DSC (differential scanning calorimetry) curves. The first peak is associated with a B2–R-transformation and increased electrical resistance ρ and the other two correspond to the development of an R–B19′-martensitic transformation occurring in two stages, and are followed by a two-stage drop of electrical resistance in the ρ(T) plot. The high-temperature stage of the R–B19′-martensitic transition is associated with transformations under the action of local stress fields in the vicinity of disperse Ti3Ni4 particles measuring ~400 nm, while the low-temperature stage is associated with transformations in the spaces between large particles containing fine disperse β′-phase particles isostructural with respect to the matrix, measuring 3–5 nm, which are formed during slow cooling from 823 K or in the course of low-temperature aging at 573–623 K.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 100–108, August, 2014.
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Panchenko, E.Y., Chumlyakov, Y.I. & Maier, H. Features of Multistage Thermoelastic B2–R–B19′ Martensitic Transformations in Heterophase Single Crystals of Ti–Ni Alloys. Russ Phys J 57, 1116–1125 (2014). https://doi.org/10.1007/s11182-014-0352-1
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DOI: https://doi.org/10.1007/s11182-014-0352-1