Experimental Mechanics

, Volume 47, Issue 1, pp 133–142 | Cite as

Nanoindentation and Microindentation of CuAlNi Shape Memory Alloy

  • W. C. CroneEmail author
  • H. Brock
  • A. Creuziger


Nanoindentation and microindentation studies were conducted within individual grains of a CuAlNi shape memory alloy. Linear surface features were observed near the indentations after unloading, many of which were responsive to heating. Crystallographic orientation information was obtained from electron backscattering diffraction in order to compare the orientation of observed surface features to predicted austenite–martensite interfaces, slip planes, and possible fracture planes in this alloy. Most of the features observed can be attributed to austenite–martensite interfaces, which remain in the material after unloading due to the constraints of the plastic deformation created by indentation. Due to the temperature dependence of the transformation stress in shape memory alloys, these stress-induced martensites are observed to diminish with heating and to reappear with cooling. Plastic deformation is observed in the form of pile-up near the indentation.


Nanoindentation Microindentation AFM Shape memory alloy CuAlNi 


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  1. 1.
    Oliver WC, Pharr GM (1992) An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J Mater Res 7:1564–1583, June.Google Scholar
  2. 2.
    Moyne S, Poilane C, Kitamura K, Miyazaki S, Delobelle P, Lexcellent C (1999) Analysis of the thermomechanical behavior of Ti–Ni shape memory alloy thin films by bulging and nanoindentation procedures. Mater Sci Eng A 275:727–732, December.CrossRefGoogle Scholar
  3. 3.
    Shaw GA, Stone DS, Johnson AD, Ellis AB, Crone WC (2003) The shape memory effect in nanoindentation of nickel–titanium thin films. Appl Phys Lett 83(2):257–259.CrossRefGoogle Scholar
  4. 4.
    Ni WY, Cheng Y-T, Grummon DS (2003) Microscopic superelastic behavior of a nickel–titanium alloy under complex loading conditions. Appl Phys Lett 82:2811–2813, April.CrossRefGoogle Scholar
  5. 5.
    Ma X-G, Komvopoulos K (2003) Nanoscale pseudoelastic behavior of indented titanium–nickel films. Appl Phys Lett 83:3773–3775, November.CrossRefGoogle Scholar
  6. 6.
    Liu C, Sun Q, Zhao Y, Yu T (2002) Depth dependence of nanohardness in a CuAlNi single crystal shape memory alloy. Int J of Nonlinear Sci & Numer Simul 3(3–4):535–538.Google Scholar
  7. 7.
    Liu C, Zhao Y, Sun Q, Yu T, Cao Z (2005) Characteristic of microscopic shape memory effect in a CuAlNi alloy by nanoindentation. J Mater Sci 40:1501–1504.CrossRefGoogle Scholar
  8. 8.
    Liu C, Zhao Y, Yu T (2005) Measurement of microscopic deformation in a CuAlNi single crystal alloy by nanoindentation with a heating stage. Mater Des 26:465–468.Google Scholar
  9. 9.
    Ni W, Cheng Y, Grummon D (2002) Recovery of microindents in a nickel–titanium shape-memory alloy: a “self-healing” effect. Appl Phys Lett 80:3310.CrossRefGoogle Scholar
  10. 10.
    Gall K, Juntunen K, Maier HJ, Sehitoglu H, Chumlyakov YI (2001) Instrumented micro-indentation of NiTi shape-memory alloys. Acta Mater 49:3205–3217, September.CrossRefGoogle Scholar
  11. 11.
    Gall K, Dunn ML, Liu Y, Labossiere P, Sehitoglu H, Chumlyakov YI (2002) Micro and macro deformation of single crystal NiTi. J Eng Mater Technol 124:238–245.CrossRefGoogle Scholar
  12. 12.
    Hane KF, Shield TW (1998) Symmetry and microstructure in martensites. Philos Mag A 78:1215–1252.CrossRefGoogle Scholar
  13. 13.
    Hane KF, Shield TW (2000) Microstructure in the cubic to trigonal transition. Mater Sci Eng A291:147–159.Google Scholar
  14. 14.
    Hane KF, Shield TW (2000) Microstructure in a cubic to orthorhombic transition. J Elast 59:267–318.zbMATHCrossRefGoogle Scholar
  15. 15.
    Hane KF, Shield TW (1999) Microstructe in the cubic to monoclinic transition in titanium–nickel shape memory alloys. Acta Metall 47:2603–2617.Google Scholar
  16. 16.
    Hane KF (1998) Microstructures in thermoelastic martensites. PhD thesis, University of Minnesota.Google Scholar
  17. 17.
    Bhattacharya K (2003) Microstructure of martensite. Oxford University Press.Google Scholar
  18. 18.
    James RD, Hane KF (2000) Martensitic transformations and shape-memory materials. Acta Mater 48:197–222.CrossRefGoogle Scholar
  19. 19.
    Vasko GM, Leo PH, Shield TW (2002) Prediction and observation of crack tip microstructure in shape memory CuAlNi single crystals. J Mech Phys Solids 50:1843–1867.zbMATHCrossRefGoogle Scholar
  20. 20.
    Shield TW (2005) “ctm-0.0.1” University of Minnesota, personal communication.Google Scholar
  21. 21.
    Shield TW (1995) Orientation dependence of the pseudoelastic behavior of single crystals of CuAlNi in tension. J Mech Phys Solids 43:869–895.CrossRefGoogle Scholar
  22. 22.
    Loughran GM, Shield TW, Leo PH (2003) Fracture of shape memory CuAlNi single crystal. Int J Solids Struct 40:271–294.CrossRefGoogle Scholar
  23. 23.
    Otsuka K, Wayman CM (1998) Mechanism of shape memory effect and superelasticity. In: Otsuka K, Wayman CM (eds) Shape Memory Materials. Cambridge University Press.Google Scholar

Copyright information

© Society for Experimental Mechanics 2007

Authors and Affiliations

  1. 1.Department of Engineering PhysicsUniversity of Wisconsin—MadisonMadisonUSA
  2. 2.Materials Science ProgramUniversity of Wisconsin—MadisonMadisonUSA
  3. 3.Engineering Mechanics ProgramUniversity of Wisconsin—MadisonMadisonUSA

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