Nanoindentation of a Pseudoelastic NiTiFe Shape Memory Alloy (bibtex)

by J. Pfetzing-Micklich, M.F.-X. Wagner, R. Zarnetta, J. Frenzel, G. Eggeler, A.E. Markaki, J. Wheeler, T.W. Clyne

Abstract:
Nanoindentation is a suitable tool for characterizing the local mechanical properties of shape memory alloys (SMA) and to study their pseudoelastic behavior. There is a special interest in indenting with different indenter tips (as not all tips are associated with strain states that predominantly induce the martensitic transformation) and in indenting at different temperatures, where different phases are present. In this study, we perform nanoindentation on a ternary NiTiFe SMA with different indenter tips and at various testing temperatures. For nanoindentation with spherical tips, load–displacement hystereses clearly indicate pseudoelastic behavior, where as indentation with Berkovich tips results in more pronounced plastic deformation. Testing at different temperatures is associated with different volume fractions of austenite, martensite, and R-phase. The corresponding nanoindentation responses differ considerably in terms of pseudoelastic behavior. Best pseudoelastic recovery is found at testing temperatures close to the R-phase start temperature, even though this temperature is below the austenite finish temperature, which is a well-known lower temperature bound for full recovery in macroscopic tests. Our results are discussed considering micromechanical aspects and the interaction between stress-induced phase transformation and dislocation plasticity.
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Reference:
Pfetzing-Micklich, J., Wagner, M.F.-X., Zarnetta, R., Frenzel, J., Eggeler, G., Markaki, A.E., Wheeler, J., Clyne, T.W.: Nanoindentation of a Pseudoelastic NiTiFe Shape Memory Alloy, Advanced Engineering Materials 12, 13-19, 2010.
Bibtex Entry:
@Article{Pfetzing-Micklich2010,
  Title                    = {{Nanoindentation of a Pseudoelastic {NiTiFe} Shape Memory Alloy}},
  Author                   = {Pfetzing-Micklich, J. and Wagner, M.F.-X. and Zarnetta, R. and Frenzel, J. and Eggeler, G. and Markaki, A.E. and Wheeler, J. and Clyne, T.W.},
  Journal                  = {Advanced Engineering Materials},
  Year                     = {2010},
  Number                   = {1-2},
  Pages                    = {13--19},
  Volume                   = {12},

  Abstract                 = {Nanoindentation is a suitable tool for characterizing the local mechanical properties of shape memory alloys (SMA) and to study their pseudoelastic behavior. There is a special interest in indenting with different indenter tips (as not all tips are associated with strain states that predominantly induce the martensitic transformation) and in indenting at different temperatures, where different phases are present. In this study, we perform nanoindentation on a ternary NiTiFe SMA with different indenter tips and at various testing temperatures. For nanoindentation with spherical tips, load–displacement hystereses clearly indicate pseudoelastic behavior, where as indentation with Berkovich tips results in more pronounced plastic deformation. Testing at different temperatures is associated with different volume fractions of austenite, martensite, and R-phase. The corresponding nanoindentation responses differ considerably in terms of pseudoelastic behavior. Best pseudoelastic recovery is found at testing temperatures close to the R-phase start temperature, even though this temperature is below the austenite finish temperature, which is a well-known lower temperature bound for full recovery in macroscopic tests. Our results are discussed considering micromechanical aspects and the interaction between stress-induced phase transformation and dislocation plasticity.},
  Annote                   = {Erneut ver\"{o}ffentlicht im AEM-Sonderband “Best of MSE 2012”, S63-S69},
  Doi                      = {10.1002/adem.200900266},
  ISSN                     = {14381656},
  Url                      = {http://doi.wiley.com/10.1002/adem.200900266}
}
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