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B2 ⇒ B19′ ⇒ B2T Martensitic Transformation as a Mechanism of Plastic Deformation of NiTi

  • P. ŠittnerEmail author
  • L. Heller
  • P. Sedlák
  • Y. Chen
  • O. Tyc
  • O. Molnárová
  • L. Kadeřávek
  • H. Seiner
SMST2019
  • 53 Downloads

Abstract

Deformation of superelastic NiTi wire with tailored microstructure was investigated in tensile loading–unloading tests up to the end of the stress plateau in wide temperature range from room temperature up to 200 °C. Lattice defects left in the microstructure of deformed wires were investigated by transmission electron microscopy. Tensile deformation is localized up to the highest test temperatures, even if practically no martensite phase exists in the wire at the end of the stress plateau. In tensile tests at elevated temperatures around 100 °C, at which the upper plateau stress approaches the yield stress for plastic deformation of martensite, upper plateau strains become unusually long, transformation strains become unrecoverable and deformation bands containing {114} austenite twins appear in the microstructure of deformed wires. These observations were rationalized by assuming activity of B2 ⇒ B19′ ⇒ B2T martensitic transformation into the austenite twins representing a new mechanism of plastic deformation of NiTi, additional to the dislocation slip in austenite and/or martensite. It is claimed that this transformation becomes activated in any thermomechanical load in which the oriented B19′ martensite is exposed to high stress at high temperatures, as e.g., during shape setting or actuator cycling at high applied stress.

Keywords

Materials Stress-induced martensitic transformation Superelasticity Twinning 

Notes

Acknowledgements

Ms. Y. Chen acknowledges the support of her Ph.D. work from Nanjing University of Aeronautics and Astronautics, China as well as from the Functional Materials Department, Institute of Physics of the ASCR, Prague, Czech Republic. Support of the research from Czech Science Foundation (CSF) projects 18-03834S (P. Šittner), 17-00393 J (L. Heller) is acknowledged. MEYS of the Czech Republic is acknowledged for the support of infrastructure projects FUNBIO-SAFMAT (LM2015088), LNSM (LM2015087), SOLID 21 (CZ.02.1.01/0.0/0.0/16_019/0000760) and European Spallation Source—participation of the Czech Republic – OP (CZ.02.1.01/0.0/0.0/16_013/0001794). National Natural Science Foundation of China (No. 11872207) is acknowledged.

References

  1. 1.
    Otsuka K, Ren X (2005) Physical metallurgy of Ti–Ni-based shape memory alloys. Prog Mater Sci 50:511–678.  https://doi.org/10.1016/j.pmatsci.2004.10.001 CrossRefGoogle Scholar
  2. 2.
    Chowdhury P, Sehitoglu H (2017) A revisit to atomistic rationale for slip in shape memory alloys. Prog Mater Sci 8:51–42.  https://doi.org/10.1016/j.pmatsci.2016.10.002 CrossRefGoogle Scholar
  3. 3.
    Heller L, Seiner H, Šittner P, Sedlák P, Tyc O, Kadeřávek L (2018) On the plastic deformation accompanying cyclic martensitic transformation in thermomechanically loaded NiTi. Int J Plast 111:53–71.  https://doi.org/10.1016/j.ijplas.2018.07.007 CrossRefGoogle Scholar
  4. 4.
    Heller L, Šittner P, Sedlák P, Seiner H, Tyc O, Kadeřávek L, Sedmák P, Vronka M (2019) Beyond the strain recoverability of martensitic transformation in NiTi. Int J Plast 116:232–264.  https://doi.org/10.1016/j.ijplas.2019.01.007 CrossRefGoogle Scholar
  5. 5.
    Šittner P, Sedlák P, Seiner H, Sedmák P, Pilch J, Delville R, Heller L, Kadeřávek L (2018) On the coupling between martensitic transformation and plasticity in NiTi: experiments and continuum based modelling. Prog Mater Sci 98:249–298.  https://doi.org/10.1016/j.pmatsci.2018.07.003 CrossRefGoogle Scholar
  6. 6.
    Chen Y, Tyc O, Kadeřávek L, Molnárová O, Heller L, Šittner P (2019) Temperature and microstructure dependence of localized tensile deformation of superelastic NiTi wires. Mater Des.  https://doi.org/10.1016/j.matdes.2019.107797 CrossRefGoogle Scholar
  7. 7.
    Tyumentsev AN, Surikova NS, Litovchenko IY, Pinzhin YP, Korotaev AD, Lysenko OV (2004) Mechanism of deformation and crystal lattice reorientation in strain localization bands and deformation twins of the B2 phase of titanium nickelide. Acta Mater 52:2067–2074.  https://doi.org/10.1016/J.ACTAMAT.2004.01.001 CrossRefGoogle Scholar
  8. 8.
    Karaman I, Kulkarni AV, Luo ZP (2005) Transformation behaviour and unusual twinning in a NiTi shape memory alloy ausformed using equal channel angular extrusion. Philos Mag 85:1729–1745.  https://doi.org/10.1080/14786430412331331961 CrossRefGoogle Scholar
  9. 9.
    Karaman I, Yapici GG, Chumlyakov YI, Kireeva IV (2005) Deformation twinning in difficult-to-work alloys during severe plastic deformation. Mater Sci Eng, A 410–411:243–247.  https://doi.org/10.1016/j.msea.2005.08.021 CrossRefGoogle Scholar
  10. 10.
    Moberly WJ, Proft JL, Duerig TW, Sinclair R (1990) Deformation, twinning and thermo-mechanical strengthening of Ti50Ni47Fe3. Acta Metall. Mater. 38:2601–2612.  https://doi.org/10.1016/0956-7151(90)90272-I CrossRefGoogle Scholar
  11. 11.
    Surikova NS, Tyumentsev AN, Evtushenko OV (2009) Stress-induced martensitic transformations in [001] crystals of titanium nickelide and its relation to mechanical twinning in the B2-phase. Russ. Phys. J. 52:612–621.  https://doi.org/10.1007/s11182-009-9271-y CrossRefGoogle Scholar
  12. 12.
    Nishida M, Tanaka K, Li S, Kohshima M, Miura S, Asai M (2003) Microstructure modifications by tensile deformation in Ti-Ni-Fe alloy. J. Phys. IV France 112:803.  https://doi.org/10.1051/jp4:20031003 CrossRefGoogle Scholar
  13. 13.
    Ii S, Yamauchi K, Maruhashi Y, Nishida M (2003) Direct evidence of correlation between{2 0 1̄}B19′ and {1 1 4}B2 deformation twins in Ti–Ni shape memory alloy. Scr Mater 49:723–727.  https://doi.org/10.1016/S1359-6462(03)00356-7 CrossRefGoogle Scholar
  14. 14.
    Nishida M, Matsuda M, Fujimoto T, Tanaka K, Kakisaka A, Nakashima H (2006) Crystallography of deformation twin boundaries in a B2 type Ti–Ni alloy. Mater Sci Eng A 438–440:495–499.  https://doi.org/10.1016/j.msea.2006.03.111 CrossRefGoogle Scholar
  15. 15.
    Ezaz T, Sehitoglu H, Abuzaid W, Maier HJ (2012) Higher order twin modes in martensitic NiTi—The (20–1) case. Mater Sci Eng A 558:422–430.  https://doi.org/10.1016/J.MSEA.2012.08.022 CrossRefGoogle Scholar
  16. 16.
    Ezaz T, Sehitoglu H, Maier HJ (2012) Energetics of (114) twinning in B2 NiTi under coupled shear and shuffle. Acta Mater 60:339–348.  https://doi.org/10.1016/j.actamat.2011.09.032 CrossRefGoogle Scholar
  17. 17.
    Gao Y (2019) Symmetry and pathway analyses of the twinning 1 modes in Ni-Ti shape memory alloys. Materialia 6:100320.  https://doi.org/10.1016/j.mtla.2019.100320 CrossRefGoogle Scholar
  18. 18.
    Gao Y, Casalena L, Bowers M, Noebe RD, Mills MJ, Wang Y (2017) An origin of functional fatigue of shape memory alloys. Acta Mater 126:389–400.  https://doi.org/10.1016/J.ACTAMAT.2017.01.001 CrossRefGoogle Scholar
  19. 19.
    Bowers ML, Gao Y, Yang L, Gaydosh DJ, De Graef M, Noebe RD, Wang Y, Mills MJ (2015) Austenite grain refinement during load-biased thermal cycling of a Ni49.9Ti50.1 shape memory alloy. Acta Mater 91:318–329.  https://doi.org/10.1016/j.actamat.2015.03.017 CrossRefGoogle Scholar
  20. 20.
    Chen Y, Tyc O, Molnárová O, Heller L, Šittner P (2019) Tensile deformation of superelastic NiTi wires in wide temperature and microstructure ranges. Shape Mem Superelast 5:42–62.  https://doi.org/10.1007/s40830-018-00205-2 CrossRefGoogle Scholar
  21. 21.
    Chen Y, Tyc O, Kadeřávek L, Molnárová O, Heller L, Šittner P (2019) Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals. Acta Mater 180:243–259.  https://doi.org/10.1016/j.actamat.2019.09.012 CrossRefGoogle Scholar
  22. 22.
    Sedmák P, Pilch J, Heller L, Kopeček J, Wright J, Sedlák P, Frost M (2016) Grain-resolved analysis of localized deformation in nickel-titanium wire under tensile load. Science 353:559–562.  https://doi.org/10.1126/science.aad6700 CrossRefGoogle Scholar
  23. 23.
    Šittner P, Molnárová O, Kadeřávek L, Tyc O, Heller YL (2019) Deformation twinning in martensite affecting functional behavior of NiTi shape memory alloys. Acta Mater.  https://doi.org/10.1016/j.mtla.2019.100506 CrossRefGoogle Scholar
  24. 24.
    Ezaz T, Sehitoglu H, Maier HJ (2011) Energetics of twinning in martensitic NiTi. Acta Mater 59:5893–5904.  https://doi.org/10.1016/j.actamat.2011.05.063 CrossRefGoogle Scholar
  25. 25.
    Bhattacharya K (2003) Microstructure of martensite: why it forms and how it gives rise to the shape-memory effect. Oxford University Press, OxfordGoogle Scholar
  26. 26.
    Delville R, Malard B, Pilch J, Sittner P, Schryvers D (2011) Transmission electron microscopy investigation of dislocation slip during superelastic cycling of Ni–Ti wires. Int J Plast 27:282–297.  https://doi.org/10.1016/J.IJPLAS.2010.05.005 CrossRefGoogle Scholar
  27. 27.
    Bowers ML, Chen X, De Graef M, Anderson PM, Mills MJ (2014) Characterization and modeling of defects generated in pseudoelastically deformed NiTi microcrystals. Scripta Mater 78–79:69–72.  https://doi.org/10.1016/j.scriptamat.2014.02.001 CrossRefGoogle Scholar
  28. 28.
    Paranjape HM, Bowers ML, Mills MJ, Anderson PM (2017) Mechanisms for phase transformation induced slip in shape memory alloy micro-crystals. Acta Mater 132:444–454.  https://doi.org/10.1016/j.actamat.2017.04.066 CrossRefGoogle Scholar
  29. 29.
    Eggeler G, Hornbogen E, Yawny A, Heckmann A, Wagner M (2004) Structural and functional fatigue of NiTi shape memory alloys. Mater Sci Eng A 378:24–33CrossRefGoogle Scholar
  30. 30.
    Zhang Y, Moumni Z, You Y, Zhang W, Zhu J, Anlas G (2019) Multiscale TRIP-based investigation of low-cycle fatigue of polycrystalline NiTi shape memory alloys. Int J Plast 115:307–329.  https://doi.org/10.1016/j.ijplas.2018.12.003 CrossRefGoogle Scholar
  31. 31.
    Atli KC, Franco BE, Karaman I, Gaydosh D, Noebe RD (2013) Influence of crystallographic compatibility on residual strain of TiNi based shape memory alloys during thermo-mechanical cycling. Mater Sci Eng A 574:9–16CrossRefGoogle Scholar
  32. 32.
    Tyc O, Heller L, Vronka M, Šittner P (2019) The effect of temperature on superelastic fatigue of NiTi wires. Int J Fatig 31(4):751–758Google Scholar
  33. 33.
    Sedlák P, Frost M, Benesova B, Ben Zineb T, Sittner P (2012) Thermomechanical model for NiTi-based shape memory alloys including R-phase and material anisotropy under multi-axial loadings. Int J Plast 39:132–151.  https://doi.org/10.1016/j.ijplas.2012.06.008 CrossRefGoogle Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  • P. Šittner
    • 1
    • 3
    Email author
  • L. Heller
    • 1
    • 3
  • P. Sedlák
    • 1
    • 5
  • Y. Chen
    • 2
  • O. Tyc
    • 3
    • 4
  • O. Molnárová
    • 3
  • L. Kadeřávek
    • 3
    • 4
  • H. Seiner
    • 5
  1. 1.Nuclear Physics Institute of the CASHusinec, ŘežCzech Republic
  2. 2.State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjingChina
  3. 3.Institute of Physics of the CASPragueCzech Republic
  4. 4.Faculty of Nuclear Sciences and Physical EngineeringCTU PraguePrague 2Czech Republic
  5. 5.Institute of Thermomechanics of the CASPragueCzech Republic

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