TY - JOUR

T1 - Shape Memory effect and Superelasticity in the [001] Single crystals of a FeNiCoAlTa Alloy with γ-α′-Thermoelastic Martensitic Transformations

AU - Chumlyakov, Yu I.

AU - Kireeva, I. V.

AU - Kretinina, I. V.

AU - Keinikh, K. S.

AU - Kuts, O. A.

AU - Kirillov, V. A.

AU - Karaman, I.

AU - Maier, H.

N1 - Funding information: 4. It has been found out that the temperature dependence of the stresses of the onset of martensitic transformations under loading is described by the Clapeyron–Clausius equation and ? = d?cr/dT is equal to 3.2– 3.8 MPa/K. This study has been funded using the RFBR grants, Nos. 12-03-00098 and 12-08-91331 NNIO.

PY - 2013/12/12

Y1 - 2013/12/12

N2 - 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.

AB - 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.

KW - nanosized γ′-phase particles

KW - shape memory effect

KW - single crystals of iron-base alloys

KW - superelasticity

KW - thermoelastic martensitic transformations

UR - http://www.scopus.com/inward/record.url?scp=84898796817&partnerID=8YFLogxK

U2 - 10.1007/s11182-013-0119-0

DO - 10.1007/s11182-013-0119-0

M3 - Article

AN - SCOPUS:84898796817

VL - 56

SP - 920

EP - 929

JO - Russian physics journal

JF - Russian physics journal

SN - 1064-8887

IS - 8

ER -