Journal of Materials Engineering and Performance

, Volume 21, Issue 12, pp 2594–2599 | Cite as

Hot Deformation Behavior of NiTiHf Shape Memory Alloy Under Hot Compression Test

  • Majid Belbasi
  • Mohammad T. Salehi
  • Seyed Ali Asghar Akbari Mousavi


In this study, the hot deformation behavior of Ni49Ti36Hf15 alloy was investigated. Compression tests were carried out at temperatures ranging from 800 to 1100 °C and at the strain rates of 0.001–1/s. The peak stress decreases with increasing deformation temperature and decreasing strain rate, a behavior which can be described by plotting the Zener-Hollomon parameter as a function of stress. It was realized that dynamic recrystallization (DRX) was responsible for flow softening. Most of the samples exhibited typical DRX stress-strain curves with a single peak stress followed by a gradual fall down stress. Microstructure evolution showed that new recrystallized grains formed in the vicinity of grain boundaries. The hyperbolic-sine-type constitutive model of Ni49Ti36Hf15 alloy was obtained to provide basic data for determining reasonable hot-forming process. The activation energy for hot deformation of the Ni49Ti36Hf15 alloy was close to 410 kJ/mol.


casting intermetallics rolling 


  1. 1.
    X.L. Meng, Y.F. Zheng, Z. Wang, and L.C. Zhao, Effect of Aging on the Phase Transformation and Mechanical Behavior of Ti36Ni49Hf15 High Temperature Shape Memory Alloy, Scr Mater, 2000, 42, p 341–348CrossRefGoogle Scholar
  2. 2.
    X.L. Meng, Y.F. Zheng, Z. Wang, W. Cai, and L.C. Zhao, Phase Transformation and Precipitation in Aged Ti-Ni-Hf High-Temperature Shape Memory Alloys, Mater. Sci. Eng., A, 2006, 438(440), p 666–670Google Scholar
  3. 3.
    G.S. Firstov, J.V. Humbeeck, and Y.N. Koval, High-Temperature Shape Memory Alloys: Some Recent Developments, Mater. Sci. Eng., A, 2004, 378, p 2–10CrossRefGoogle Scholar
  4. 4.
    P.L. Potapov, A.V. Shelyakov, A.A. Gulyaev, E.L. Svistunova, N.M. Matveeva, and D. Hodgson, Effect of Hf on the Structure of Ni-Ti Martensitic Alloys, Mater. Lett., 1997, 32, p 247–250CrossRefGoogle Scholar
  5. 5.
    X.L. Meng, W. Cai, L.M. Wang, Y.F. Zheng, L.C. Zhao, and L.M. Zhou, Microstructure of Stress-Induced Martensite in a Ti-Ni-Hf High Temperature Shape Memory Alloy, Scr Mater, 2001, 45, p 1177–1182CrossRefGoogle Scholar
  6. 6.
    W. Cai, X.L. Meng, and L.C. Zhao, Recent Development of TiNi-Based Shape Memory Alloys, Curr. Opin. Solid State Mater. Sci., 2005, 9, p 296–302CrossRefGoogle Scholar
  7. 7.
    Y.Q. Wang, Y.F. Zheng, and L.C. Zhao, The Tensile Behavior of Ti36Ni49Hf15High Temperature Shape Memory Alloy, Scr Mater, 1999, 40, p 1327–1331CrossRefGoogle Scholar
  8. 8.
    C. Craig Wojcik, Properties and Heat Treatment of High Transition Temperature Ni-Ti-Hf Alloys, Mater. Eng. Perform., 2009, 18, p 511–516CrossRefGoogle Scholar
  9. 9.
    X.L. Meng, W. Cai, Y.D. Fu, Q.F. Li, J.X. Zhang, and L.C. Zhao, Shape-Memory Behaviors in an Aged Ni-Rich TiNiHf High Temperature Shape-Memory Alloy, Intermetallics, 2008, 16, p 698–705CrossRefGoogle Scholar
  10. 10.
    P.E. Thoma and J.J. Boehm, Effect of Composition on the Amount of Second Phase and Transformation Temperatures of NixTi90-xHf10 Shape Memory Alloys, Mater. Sci. Eng., A, 1999, 273, p 385–389CrossRefGoogle Scholar
  11. 11.
    Y. Tong, F. Chen, B. Tian, and Y. Zheng, Microstructure and Martensitic Transformation of Ti49Ni51-xHfx High Temperature Shape Memory Alloys, Mater. Lett., 2009, 63, p 1869–1871CrossRefGoogle Scholar
  12. 12.
    S. Besseghini, E. Villa, and A. Tuissi, Ni-Ti-Hf Shape Memory Alloy: Effect of Aging and Thermal Cycling, Mater. Sci. Eng., A, 1999, 273, p 390–394CrossRefGoogle Scholar
  13. 13.
    S. Han, W. Zou, S. Jin, Z. Zhang, and D. Yang, The Studies of the Martensite Transformations in a Ti36Ni49Hf15 Alloy, Scr Mater, 1995, 32, p 1441–1446CrossRefGoogle Scholar
  14. 14.
    K. Dehghani and A.A. Khamei, Hot Deformation Behavior of 60Nitinol (Ni60 wt%-Ti40 wt%) Alloy Experimental and Computational Studies, Mater. Sci. Eng., A, 2010, 527, p 684–690CrossRefGoogle Scholar
  15. 15.
    E.I. Poliak and J.J. Jonas, Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation, ISIJ Int., 2003, 43, p 684–691CrossRefGoogle Scholar
  16. 16.
    T. Sakai and J.J. Jonas, Dynamic Recrystallization: Mechanical and Microstructural Considerations, Acta Metall., 1984, 32, p 189–209CrossRefGoogle Scholar
  17. 17.
    M.J. Luton and C.M. Sellars, Dynamic Recrystallization in Nickel and Nickel-Iron Alloys During Hot Temperature Deformation, Acta Metall., 1969, 17, p 1033–1043CrossRefGoogle Scholar
  18. 18.
    X. He, Zh Yu, and X. Lai, A Method to Predict Flow Stress Considering Dynamic Recrystallization During Hot Deformation, Mater. Sci., 2008, 44, p 760–764CrossRefGoogle Scholar
  19. 19.
    H.J. Mcqueen and N.D. Ryan, Constitutive Analysis in Hot Working, Mater. Sci. Eng., A, 2002, 322, p 43–63CrossRefGoogle Scholar
  20. 20.
    Y.C. Lin, M.S. Chen, and J. Zhong, Constitutive Modeling for Elevated Temperature Flow Behavior of 42CrMo Steel, Mater. Sci., 2008, 42, p 470–477Google Scholar
  21. 21.
    D. Samantary and S. Mandal, Constitutive Analysis to Predict High Temperature Flow Stress in Modified 9Cr-1Mo Steel, Mater. Des., 2010, 31, p 981–984CrossRefGoogle Scholar

Copyright information

© ASM International 2012

Authors and Affiliations

  • Majid Belbasi
    • 1
  • Mohammad T. Salehi
    • 1
  • Seyed Ali Asghar Akbari Mousavi
    • 2
  1. 1.School of Metallurgy and Materials EngineeringIran University of Science and TechnologyTehranIran
  2. 2.School of Metallurgy and Materials Engineering, College of EngineeringUniversity of TehranTehranIran

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