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- Title
Shape Memory effect and Superelasticity in the [001] Single crystals of a FeNiCoAlTa Alloy with γ-α′-Thermoelastic Martensitic Transformations.
- Authors
Chumlyakov, Yu.; Kireeva, I.; Kretinina, I.; Keinikh, K.; Kuts, O.; Kirillov, V.; Karaman, I.; Maier, H.
- Abstract
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)(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.
- Subjects
SHAPE memory effect; SINGLE crystals; THERMOELASTICITY; MARTENSITIC structure; PRECIPITATION (Chemistry)
- Publication
Russian Physics Journal, 2013, Vol 56, Issue 8, p920
- ISSN
1064-8887
- Publication type
Article
- DOI
10.1007/s11182-013-0119-0