Cryogenic Immersion Time Influence on Thermal and Mechanical Properties of a Ni48-Ti52 Shape Memory Alloy

  • Bartholomeu Ferreira da Cruz Filho
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Smart Memory Alloys (SMA) have great potential for application in various engineering and medicine fields. In applications in which these materials are used as actuators, there is a need for improvement of their properties such as resistance to thermomechanical fatigue and structural fatigue. This work investigates the potential of cryogenic treatment to change properties of SMA. Deep cryogenic treatment has been used for decades to enhance material properties in steels, such as the wear resistance increase in tool steels and fatigue life in ferrous materials. The objective of this study is to investigate the influence of deep cryogenic treatment on mechanical properties (elastic modulus, damping, and stiffness) and thermal properties (phase transformation temperatures and latent heat processing) of Ni48-Ti52 alloy. In this study, an experimental comparative analysis of these properties was carried out before and after the cryogenic treatment at −196 °C using different immersion times. The test samples were prepared and referred to as NiTi_CR (CPs as received), NiTi_TC12, NiTi_TC18, and NiTi_TC24 (CPs cryogenically treated by immersion −196 °C for 12, 18, and 24 h, respectively). The heating and cooling rate used was 18 °C/h. These thermal properties were measured by Differential Scanning Calorimetry and the mechanical properties by Impulse Excitation. Microstructural analysis was based on optical and electronic microscopy scanning and X-ray diffraction. The results showed that cryogenic treatment affects all the properties investigated, with emphasis on reducing the latent heat of transformation and increasing the damping factor. Microstructural analysis indicates that these changes may be associated with changes in grain size and precipitates.


Criogeonic treatment NiTi alloys Ni48-Ti52 alloy Martensitic transformations 


  1. 1.
    Mariante GR (1999) Efeito do tratamento Criogênico nas propriedades mecânicas do aço rápido AISI M2, In: Dissertação de mestrado—PPGEM-UFRJGoogle Scholar
  2. 2.
    Surberg CH, Stratton P, Lingenhöle K (2008) The effect of some heat treatment parameters on the dimensional stability of AISI D2. Cryogenics 48:42–47CrossRefGoogle Scholar
  3. 3.
    Yen PL (1997). Formation of fine eta carbide in special cryogenic and tempering process key to improve properties of alloy steels. Ind Heat 14:40–44Google Scholar
  4. 4.
    Gobbi SJ (2009) Influência do tratamento criogênico na resistência ao desgaste do aço para Trabalho a frio AISI D2. Dissertação de Mestrado em Ciência Mecânicas, Publicação ENM.DM 132/09. Departamento de Engenharia Mecânica, Universidade de Brasília, Brasília, DF, 96pGoogle Scholar
  5. 5.
    Ashiuchi ES (2009) Influência do tratamento criogênico na fadiga sob condições de fretting no AL 7050-T7451. Dissertação de Mestrado em Ciências Mecânicas, Departamento de Engenharia Mecânica, Universidade de Brasília, Brasília, DF, 95pGoogle Scholar
  6. 6.
    Moreira et al (2009) Influência do tratamento criogênico na usinabilidade do aço rolamento ABNT 52100 temperadoCrossRefGoogle Scholar
  7. 7.
    Otsuka KE, Wayman CM (1998). Shape memory materials. Cambridge University Press, Cambridge, UKGoogle Scholar
  8. 8.
    Cai W, Lu XL, Zhao LC (2005) Damping behavior of TiNi-based shape memory alloys. Mater Sci Eng A 394:78–82CrossRefGoogle Scholar
  9. 9.
    Silva NJ et al (2011) Comparative study of dynamic properties a NiTi alloy with shape memory and classical structural materials. Matérial (Rio J.), Rio de janeiro 16(4)Google Scholar
  10. 10.
    Van Humbeeck J (2003) Damping capacity of thermoelastic martensite in shape memory alloys. J Alloy Compd 355:58–64CrossRefGoogle Scholar
  11. 11.
    Dieter GE (1988) Mechanical metallurgy. SI metric edn. McGraw-Hill Book Company, London, p 620Google Scholar
  12. 12.
    Cross WB, Kriotis AH, Ans Stimler FJ Nitinol characteization Study for NASA—langley Research Center under Contract NAS 1-7522 to define the structural and recovery proprieties of several Nitinol compositions possessing different transition temperature. The study was essentially a 19-month program conducted from July 1967 through January 1969Google Scholar
  13. 13.
    Saburi T (1998) Ti-Ni shape memory alloys. In: Otsuk K, Waymann CM Shape memory materials. Cambridge University Press, pp 49–46Google Scholar
  14. 14.
    Ishida A, Sato A, Miyazaki S (1997) Microstructure of Ti-Rich Ti-Ni thin films. In: Proceedings of the second international conference on shape memory and superelastic technologies, SMST-97. p 161Google Scholar
  15. 15.
    Nishiyama Z (1978) Martensitic transformation. In: Morris EF, Meshii M, Wayman CM (eds) Academic PressGoogle Scholar
  16. 16.
    Guimarães JRC, Rios PR (2010) Martensite start temperature and the austenite grain-size. J Mater Sci 45(4):1074–1077CrossRefGoogle Scholar
  17. 17.
    Yang H-S, Bhadeshia HKDH (2009) Austenite grain size and the martensite-start temperature. Scripta Mater 60:493–495CrossRefGoogle Scholar

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© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Bartholomeu Ferreira da Cruz Filho
    • 1
  1. 1.BrasiliaBrazil

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