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Microstructure and Mechanical Behavior of a TiNi Alloy during Multiple Martensitic Transformations and Annealing

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Russian Metallurgy (Metally) Aims and scope

Abstract—The effect of preliminary thermal cycling and annealing performed in the range of aging temperatures on the microstructure and mechanical behavior of a TiNi alloy is considered. The structure in the initial state consists of almost dislocation-free austenite grains. Equal-channel angular pressing results in an ultra-fine grained (UFG) structure consisting of equiaxed grains with an average size of 400 nm in the Ti49Ni51 alloy. The maximum number of thermal cycles is n = 100. The yield strength decreases when the number of thermal cycles increases to n = 100, which can be attributed to a saturation effect. The significant decrease in the yield strength at n = 100 can be associated with a high density of defects and aging particles, which cause the fracture of samples at lower tensile strength values, making dislocation motion difficult. Thermal cycling and subsequent annealing at 400°C do not change the grain size. The results of tensile tests show that thermal cycling (n = 100) and subsequent aging increase the tensile strength and yield strength in the UFG state.

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ACKNOWLEDGMENTS

The tensile tests were performed at the Nanotech Testing Center for Collective Use, Ufa State Aviation Technical University.

Funding

This work was supported by the Russian Science Foundation, project no. 20-72-00075.

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Authors and Affiliations

  1. Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre, Russian Academy of Sciences, Ufa, Russia

    A. A. Churakova

  2. Ufa State Aviation Technical University, Ufa, Russia

    A. A. Churakova & E. M. Kayumova

  3. Ufa State Petroleum Technological University, Ufa, Russia

    E. M. Kayumova

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  1. A. A. Churakova
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  2. E. M. Kayumova
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Correspondence to A. A. Churakova.

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The authors declare that they have no conflicts of interest.

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Translated by T. Gapontseva

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Churakova, A.A., Kayumova, E.M. Microstructure and Mechanical Behavior of a TiNi Alloy during Multiple Martensitic Transformations and Annealing. Russ. Metall. 2022, 727–734 (2022). https://doi.org/10.1134/S0036029522070035

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