Orientation dependence of cyclic stability of superelasticity of Ti50.2Ni49.8 alloy single crystals under compression

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Abstract

The effect of marforming (low-temperature compression deformation of В19′-martensite at 203 K and subsequent annealing at 713 K for 0.5 h) on superelasticity (SE), temperature range of SE, and cyclic stability of superelastic behavior 323 K are studied on [001]В2 and [112]В2 single crystals of the Ti50.2Ni49.8 (at %) alloy under compression. It is shown that marforming leads to an increase in the offset yield strength σ0.1 of the high-temperature В2-phase and to the development of SE, which was not observed in quenched crystals. The orientation dependence of the SE temperature range and the cyclic stability of superelastic behavior, which is determined by the orientation dependence of the σ0.1 stresses of the В2-phase, is established. The maximum SE temperature range is 87 K, and the cyclic stability of superelastic behavior at a temperature of 323 K is sound in the [001]В2 orientation with a high σ0.1 stress level of the В2-phase.

About the authors

I. V. Kireeva

Siberian Physical-Technical Institute, National Research Tomsk State University

Author for correspondence.
Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

Yu. I. Chumlyakov

Siberian Physical-Technical Institute, National Research Tomsk State University

Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

A. V. Vyrodova

Siberian Physical-Technical Institute, National Research Tomsk State University

Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

A. A. Saraeva

Siberian Physical-Technical Institute, National Research Tomsk State University

Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

Z. V. Pobedennaya

Siberian Physical-Technical Institute, National Research Tomsk State University

Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

E. C. Marchenko

Siberian Physical-Technical Institute, National Research Tomsk State University

Email: kireeva@spti.tsu.ru
Russian Federation, Tomsk, 634050

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