Influences of 2.5wt% Mn addition on the microstructure and mechanical properties of Cu-Al-Ni shape memory alloys

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Abstract

The influences of 2.5wt% Mn addition on the microstructure and mechanical properties of the Cu-11.9wt%Al-3.8wt%Ni shape memory alloy (SMA) were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), and differential scanning calorimeter (DSC). The experimental results show that Mn addition influences considerably the austenite-martensite transformation temperatures and the kind of martensite in the Cu-Al-Ni alloy. The martensitic transformation changes from a mixed xed β1→β′1+γ′1 transformation to a single β1→β′1 martensite transformation together with a decrease in transformation temperatures. In addition, the observations reveal that the grain size of the Cu-Al-Ni alloy can be controlled with the addition of 2.5wt% Mn and thus its mechanical properties can be enhanced. The Cu-Al-Ni-Mn alloy exhibits better mechanical properties with the high ultimate compression strength and ductility of 952 MPa and 15%, respectively. These improvements are attributed to a decrease in grain size. However, the hardness decreases from Hv 230 to Hv 140 with the Mn addition.

Keywords

Cu-Al-Ni shape memory alloys martensitic transformations grain size mechanical properties 
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References

  1. [1]
    J.I. Perez-Landazabal, V. Recarte, V. Sanches-Alarcos, M.L. No, and S.J. Juan, Study of the stability and decomposition process of the β phase in Cu-Al-Ni shape memory alloys, Mater. Sci. Eng. A, 438–440(2006), p.734.Google Scholar
  2. [2]
    G. Zak, A.C. Kneissl, and G. Zatulskij, Shape memory effect in cryogenic Cu-Al-Mn alloys, Scripta Mater., 34(1996), p.363.CrossRefGoogle Scholar
  3. [3]
    K. Otsuka and C.M. Wayman, Shape Memory Materials, Cambridge University Press, Cambridge, 1998, p.98.Google Scholar
  4. [4]
    S. Miyazaki and K. Otsuka, Development of shape memory alloys, ISIJ Int., 29(1989), p.353.CrossRefGoogle Scholar
  5. [5]
    T. Saburi and C.M. Wayman, Crystallographic similarities in shape memory martensites, Acta Metall., 27(1979), p.979.CrossRefGoogle Scholar
  6. [6]
    S. Sugimoto, H. Sakamoto, T. Hara and H. Tsuchiya, The effect of grain constraint, heat treatment and compositional change on the behavior of martensitic transformations in alloys with the composition near Cu-13Al-4Ni-1Zn (mass%), J. Phys. IV, 5(1995), p.925.Google Scholar
  7. [7]
    V. Recarte, R.B. Perez-Saez, E.H. Bocanegra, M.L. No, and J. San Juan, Influence of Al and Ni concentration on the martensitic transformation in Cu-Al-Ni shape-memory alloys, Metall. Mater. Trans. A, 33(2002), p.2581.CrossRefGoogle Scholar
  8. [8]
    U. Sarı and İ. Aksoy, Electron microscopy study of 2H and 18R martensites in Cu-11.92wt% Al-3.78wt% Ni shape memory alloy, J. Alloys Compd., 417(2006), p.138.CrossRefGoogle Scholar
  9. [9]
    Z.G. Wei, H.Y. Peng, D.Z. Yang, C.Y. Chung, and J.K.L. Lai, Reverse transformations in CuAlNiMnTi alloy at elevated temperatures, Acta Mater., 44(1996), p.1189.CrossRefGoogle Scholar
  10. [10]
    Y. Sutou, T. Omori, K. Yamauchi, N. Ono, R. Kainuma, and K. Ishida, Effect of grain size and texture on pseudoelasticity in Cu-Al-Mn-based shape memory wire, Acta Mater., 53(2005), p.4121.CrossRefGoogle Scholar
  11. [11]
    M.A. Morris, Influence of boron additions on ductility and microstructure of shape memory Cu-Al-Ni alloys, Scripta. Metall. Mater., 25(1991), p.2541.CrossRefGoogle Scholar
  12. [12]
    M.A. Morris, High temperature properties of ductile Cu-Al-Ni shape memory alloys with boron additions, Acta Metall. Mater., 40(1992), p.1573.CrossRefGoogle Scholar
  13. [13]
    M.A. Morris and T. Lipe, Microstructural influence of Mn additions on thermoelastic and pseudoelastic properties of Cu-Al-Ni alloys, Acta Metall. Mater., 42(1994), p.1583.CrossRefGoogle Scholar
  14. [14]
    U. Sarı and T. Kırındı, Effects of deformation on microstructure and mechanical properties of a Cu-Al-Ni shape memory alloy, Mater. Charact., 59(2008), p.920.CrossRefGoogle Scholar
  15. [15]
    K. Adachi, K. Shoji, and Y. Hamada, Formation of X phases shape memory alloys and origin of grain refinement added with titanium effect in Cu-Al-Ni, ISIJ Int., 29(1989), p.378.CrossRefGoogle Scholar
  16. [16]
    H. Funakubo, Shape Memory Alloys, Translated by J.B. Kennedy, Gordon and Breach Science Publishers, New York, 1987, p.154.Google Scholar
  17. [17]
    J.L.L. Gama, C.C. Dantas, N.F. Quadros, R.A.S. Ferreira, and Y.P. Yadava, Microstructure-mechanical property relationship to copper alloys with shape memory during thermomechanical treatments, Metall. Mater. Trans. A, 37(2006), p.77.CrossRefGoogle Scholar
  18. [18]
    U. Sarı and İ. Aksoy, Micro-structural analysis of self-accommodating martensites in Cu-11.92wt% Al-3.78wt% Ni shape memory alloy, J. Mater. Process. Technol., 195(2008), p.72.CrossRefGoogle Scholar
  19. [19]
    J. Malimanek and N. Zarubova, Calorimetric investigation of the movement of phase interfaces in a Cu-Al-Ni single crystal, Scripta Metall. Mater., 32(1995), p.1347.CrossRefGoogle Scholar
  20. [20]
    N. Suresh and U. Ramamurty, Effect of aging on mechanical behavior of single crystal Cu-Al-Ni shape memory alloys, Mater. Sci. Eng. A, 454–455(2007), p.492.Google Scholar
  21. [21]
    H. Sakamoto and K. Shimizu, Effect of heat treatments on thermally formed martensite phases in monocrystalline Cu-Al-Ni shape memory alloy, ISIJ Int., 29(1989), p.395.CrossRefGoogle Scholar
  22. [22]
    S. Montecinos, A. Cuniberti, and A. Sepulveda, Grain size and pseudoelastic behaviour of a Cu-Al-Be alloy, Mater. Charact., 59(2008), p.117.CrossRefGoogle Scholar

Copyright information

© Journal Publishing Center of University of Science and Technology Beijing and Springer Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Department of Computer Education and Instructional Technology, Faculty of EducationKırıkkale UniversityKırıkkaleTurkey

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