Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation

Schmahl, W.W.; Khalil-Allafi, J.; Hasse, B.; Wagner, M.; Heckmann, A.; Somsen, C.

doi:10.1016/j.msea.2003.11.081

Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation (bibtex)

by W.W. Schmahl, J. Khalil-Allafi, B. Hasse, M. Wagner, A. Heckmann, C. Somsen

Abstract:

Inhomogeneous strain distribution associated with stress induced transformation and shear-band formation in super-elastic NiTi is investigated by diffraction with synchrotron radiation and diffraction imaging. We observe a large displacement of the austenite (1 1 0) diffraction peak as a function of tensile strain. This indicates a significant load transfer on residual austenite grains within the martensite matrix of a Lüders-like shear transformation band. A distinct stress state occurs at the interface between the shear-band and the surrounding austenite.

Reference:

Schmahl, W.W., Khalil-Allafi, J., Hasse, B., Wagner, M., Heckmann, A., Somsen, C.: Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.%Ni) under extensional load with synchrotron radiation, Materials Science and Engineering A 378, 81-85, 2004.

Bibtex Entry:

@Article{Schmahl2004,
  author   = {Schmahl, W.W. and Khalil-Allafi, J. and Hasse, B. and Wagner, M. and Heckmann, A. and Somsen, C.},
  journal  = {Materials Science and Engineering A},
  title    = {{Investigation of the phase evolution in a super-elastic {NiTi} shape memory alloy (50.7 at.%{Ni}) under extensional load with synchrotron radiation}},
  year     = {2004},
  issn     = {09215093},
  number   = {1-2 SPEC. ISS.},
  pages    = {81--85},
  volume   = {378},
  abstract = {Inhomogeneous strain distribution associated with stress induced transformation and shear-band formation in super-elastic NiTi is investigated by diffraction with synchrotron radiation and diffraction imaging. We observe a large displacement of the austenite (1 1 0) diffraction peak as a function of tensile strain. This indicates a significant load transfer on residual austenite grains within the martensite matrix of a L\"{u}ders-like shear transformation band. A distinct stress state occurs at the interface between the shear-band and the surrounding austenite.},
  doi      = {10.1016/j.msea.2003.11.081},
  isbn     = {4923432144},
  keywords = {Diffraction imaging, L\"{u}ders-band, Super-elastic NiTi, Synchrotron radiation},
}