This article is cited in 25 papers

Orientation and temperature dependence of superelasticity caused by reversible $\gamma$–$\alpha'$ martensitic transformations in FeNiCoAlTa single crystals

I. V. Kireeva^a, Yu. I. Chumlyakov^a, V. A. Kirillov^a, I. Karaman^b, E. Cesari<sup>c

a</sup> Siberian Physical-Technical Institute of the Tomsk State University
^b Department of Mechanical Engineering, Texas A&M University, TX 77843, USA
^c Universitat de les Illes Balears, Departament de Fisica, E-07122 Palma de Mallorca, Spain

Abstract: Reversible thermoelastic $\gamma$–$\alpha'$ martensite transformations (MTs) have been studied in Fe–28%Ni–17%Co–11.5%Al–2.5%Ta (at.%) single crystals under cooling/heating and loading conditions. It is established that the precipitation of dispersed $\gamma'$ phase particles with an average size of $d\le$ 5 nm leads to thermoelastic $\gamma$–$\alpha'$ MTs with a small temperature hysteresis ($\Delta T$ = 20 K). The [001] oriented crystals favor the attaining of maximum superelasticity (SE) $\varepsilon_{SE}$ = 6.8%, minimum mechanical hysteresis $\Delta\sigma$ = 130 MPa, and large SE temperature interval $\Delta T_{SE}$ = 130 K. In contrast, in the $[\bar{1}11]$ oriented crystals, small values of $\varepsilon_{SE}$ = 2.0%, high values of $\Delta\sigma$ = 350–400 MPa and narrow SE interval $\Delta T_{SE}$ = 55 K are found.

Received: 12.01.2011

 English version: Technical Physics Letters, 2011, 37:5, 487–490

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