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Special Features of Functional Properties of Heterophase High-Strength Ni50.2Ti37.3Hf12.5 Polycrystals and Single Crystals

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Russian Physics Journal Aims and scope

Stress-induced B2–B19' martensitic transformations (MTs) in Ni50.2Ti37.3Hf12.5 (at.%) alloy aged at 773 K, 3 h are studied. Single crystals have lower (by 100 K) transformation temperatures (TTs) in comparison with polycrystals. Aging of single crystals results in precipitation of H- and H'-phase particles with sizes up to 15 nm thereby leading to significant strengthening of the B2 phase with σcr(B2) = 1540 MPa and manifestation of superelasticity (SE) in a temperature interval of 90 K. Low strength properties of the B2 phase with σcr(B2) = 950 MPa in polycrystals are caused by precipitation of only H-phase particles. This leads to the absence of SE. Additional martensite aging of polycrystals enhances the strength properties of the B2 phase by a factor of 1.5 up to 1450 MPa, thereby leading to the appearance of the high-temperature SE in a wide temperature interval of 110 K. This state is characterized by enhanced TTs, reduced temperature intervals of stress-induced MT, and maximal reversible strain value up to 2.0%.

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Authors and Affiliations

  1. V. D. Kuznetsov Physical-Technical Institute at Tomsk State University, Tomsk, Russia

    A. I. Tagiltsev, N. Yu. Surikov, E. Yu. Panchenko & Yu. I. Chumlyakov

  2. Texas A&M University, College Station, USA

    I. Karaman

Authors
  1. A. I. Tagiltsev
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  2. N. Yu. Surikov
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  3. E. Yu. Panchenko
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  4. Yu. I. Chumlyakov
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  5. I. Karaman
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Correspondence to A. I. Tagiltsev.

Additional information

Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 131–137, March, 2019.

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Tagiltsev, A.I., Surikov, N.Y., Panchenko, E.Y. et al. Special Features of Functional Properties of Heterophase High-Strength Ni50.2Ti37.3Hf12.5 Polycrystals and Single Crystals. Russ Phys J 62, 534–540 (2019). https://doi.org/10.1007/s11182-019-01742-8

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  • DOI: https://doi.org/10.1007/s11182-019-01742-8

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