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.

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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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Supplementary files

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2. Fig. 1. DSC curves of single crystals of Ti50.2Ni49.8 alloy after quenching.

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3. Fig. 2. Stress-strain curves of quenched single crystals of Ti50.2Ni49.8 alloy under compression at 203 K.

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4. Fig. 3. DSC curves of single crystals of Ti50.2Ni49.8 alloy after marforming: (a) – orientation [001]B2, deformation 6.75% at 203 K; (b) – B2, deformation 9.45% at 203 K.

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5. Fig. 4. Temperature range of superelasticity of Ti50.2Ni49.8 alloy single crystals after marforming under compression: (a) – orientation [001]B2; (b) – B2. The inset shows the change in mechanical hysteresis depending on the test temperature at maximum reversible deformation in the third cycle.

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6. Fig. 5. Dependence of superelastic behavior on the number of cycles for single crystals of Ti50.2Ni49.8 alloy after marforming under compression at 323 K: (a), (b) – orientation [001]B2; (c), (d) – B2; (a), (c) – stress–strain curves; (b), (d) – critical stresses σcr and mechanical hysteresis Δσ. Each subsequent 10 cycles are shifted relative to the previous ones by strain.

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7. Fig. 6. Temperature dependence of axial stresses σ0.1 of the B2-phase for single crystals of Ti50.2Ni49.8 alloy after quenching and marforming under compression.

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8. Fig. 7. Microstructure of single crystals of Ti50.2Ni49.8 alloy after marforming: (a) – R-phase; (b) – [001]B2 orientation, (012)twins in B19′-martensite; (c) – B2 orientation, B19′-martensite does not contain (012)twins.

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