The ordinary and two-way shape memory effects (SMEs) are investigated for [\( \overline{1} \)12] single crystals of Ti–51.3Ni (at.%) alloy aged at 823 K for 1.5 h in free state and under tensile stress of 150 MPa without hydrogen and after saturation by hydrogen. It is established that without hydrogen in [\( \overline{1} \)12] single crystals with one and four variants of Ti3Ni4 particles the maximum magnitude of the ordinary SME is 1.9–2.6% under the external stress σext = 250 MPa. Under σext > 250 MPa, crystals are destroyed. The magnitude of the two-way SME caused by the B2–R–B19' MT equal to 1.1% at σext = 0 is observed in [\( \overline{1} \)12] single crystals with one variant of Ti3Ni4 particles. The physical reason for the observed two-way SME is the internal compressive stresses oriented along the [\( \overline{1} \)12] directions arising from one variant of Ti3Ni4 particles as a result of aging under tensile stress of 150 MPa. It is established that hydrogen does not influence the TR temperature, reduces the plasticity, and suppresses the two-way SME. The suppression of two-way SME in the [\( \overline{1} \)12] single crystals of the Ti–51.3Ni (at.%) alloy with one variant of Ti3Ni4 particles is caused by shielding of stress fields from one variant of Ti3Ni4 particles and multiple nucleation of R- and B19' martensite variants under loading with saturation by hydrogen.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 37–43, October, 2016.
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Kireeva, I.V., Platonova, Y.N. & Chumlyakov, Y.I. Influence of Hydrogen and Number of Particle Variants on Ordinary and Two-Way Shape Memory Effects in Ti–Ni Single Crystals. Russ Phys J 59, 1560–1566 (2017). https://doi.org/10.1007/s11182-017-0944-7
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DOI: https://doi.org/10.1007/s11182-017-0944-7