Shape Memory effect and Superelasticity in the [001] Single crystals of a FeNiCoAlTa Alloy with γ–α′-Thermoelastic Martensitic Transformations Academic Article uri icon

abstract

  • Using single crystals of a Fe - 28% Ni - 17% Co - 11.5% Al - 25% Ta (a{cyrillic}t.%) 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. © 2013 Springer Science+Business Media New York.

author list (cited authors)

  • Chumlyakov, Y. I., Kireeva, I. V., Kretinina, I. V., Keinikh, K. S., Kuts, O. A., Kirillov, V. A., Karaman, I., & Maier, H.

citation count

  • 15

publication date

  • December 2013