Using single crystals of a Fe – 28% Ni – 17% Co – 11.5% Al – 25% Ta (аt.%) alloy, oriented for tensile loading along the [001] direction, the shape-memory (SME) and superelasticity (SE) effects caused by reversible thermoelastic martensitic transformations (MTs) from a high-temperature fcc-phase into a bctmartensite are investigated. It is demonstrated that the conditions necessary for the thermoelastic MTs to occur are achieved by aging at 973 K within the time interval (t) from 0.5 to 7.0 hours, which is accompanied by precipitation of the γ′-phase particles, (FeNiCo)3(AlTa), whose d < 8–12 nm. When the size of the γ′-precipitates becomes as large as d ≥ 8–12 nm, the MT becomes partially reversible. The physical causes underlying the kinetics of thermoelstic reversible fcc-bct MTs are discussed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 66–74, August, 2013.
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Chumlyakov, Y.I., Kireeva, I.V., Kretinina, I.V. et al. Shape Memory effect and Superelasticity in the [001] Single crystals of a FeNiCoAlTa Alloy with γ–α′-Thermoelastic Martensitic Transformations. Russ Phys J 56, 920–929 (2013). https://doi.org/10.1007/s11182-013-0119-0
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DOI: https://doi.org/10.1007/s11182-013-0119-0