Martensite stabilization in shape memory alloys: Experimental evidence for short-range ordering

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Peter M. Kadletz
  • Philipp Krooß
  • Yuri I. Chumlyakov
  • Matthias J. Gutmann
  • Wolfgang W. Schmahl
  • Hans J. Maier
  • Thomas Niendorf

Organisationseinheiten

Externe Organisationen

  • Ludwig-Maximilians-Universität München (LMU)
  • Technische Universität Bergakademie Freiberg
  • Tomsk State University
  • Rutherford Appleton Laboratory (RAL)
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Details

OriginalspracheEnglisch
Seiten (von - bis)16-19
Seitenumfang4
FachzeitschriftMaterials letters
Jahrgang159
PublikationsstatusVeröffentlicht - 14 Juni 2015

Abstract

Thermal stabilization of martensite in shape memory alloys is known to strongly affect functional properties due to changes in transformation temperatures. As martensite stabilization in many alloys proceeds in an uncontrollable fashion, it has been treated as a detrimental mechanism in the past. In a recent study it was found that martensite stabilization can be controlled by aging of stress-induced martensite, allowing development of a new class of high-temperature shape memory alloys. Symmetry-conforming adaptation of short-range order during thermal treatment has been stated to be the mechanism responsible for this phenomenon. However, direct experimental evidence for changes in short-range ordering has not been presented. The current study has been conducted in order to fill this gap. A Co-Ni-Ga shape memory alloy has been studied by neutron diffraction in different conditions, i.e. as-grown austenite, quenched martensite, heat-treated austenite and stabilized stress-induced martensite. The results obtained unequivocally reveal that martensite stabilization is triggered by a chemical disordering mechanism. Thus, the concept of symmetry-conforming short-range order proposed 1997 by Ren and Otsuka has finally found experimental verification for a Co-Ni-Ga alloy.

ASJC Scopus Sachgebiete

Zitieren

Martensite stabilization in shape memory alloys: Experimental evidence for short-range ordering. / Kadletz, Peter M.; Krooß, Philipp; Chumlyakov, Yuri I. et al.
in: Materials letters, Jahrgang 159, 14.06.2015, S. 16-19.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Kadletz, P. M., Krooß, P., Chumlyakov, Y. I., Gutmann, M. J., Schmahl, W. W., Maier, H. J., & Niendorf, T. (2015). Martensite stabilization in shape memory alloys: Experimental evidence for short-range ordering. Materials letters, 159, 16-19. https://doi.org/10.1016/j.matlet.2015.06.048
Kadletz PM, Krooß P, Chumlyakov YI, Gutmann MJ, Schmahl WW, Maier HJ et al. Martensite stabilization in shape memory alloys: Experimental evidence for short-range ordering. Materials letters. 2015 Jun 14;159:16-19. doi: 10.1016/j.matlet.2015.06.048
Kadletz, Peter M. ; Krooß, Philipp ; Chumlyakov, Yuri I. et al. / Martensite stabilization in shape memory alloys : Experimental evidence for short-range ordering. in: Materials letters. 2015 ; Jahrgang 159. S. 16-19.
Download
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AU - Krooß, Philipp

AU - Chumlyakov, Yuri I.

AU - Gutmann, Matthias J.

AU - Schmahl, Wolfgang W.

AU - Maier, Hans J.

AU - Niendorf, Thomas

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N2 - Thermal stabilization of martensite in shape memory alloys is known to strongly affect functional properties due to changes in transformation temperatures. As martensite stabilization in many alloys proceeds in an uncontrollable fashion, it has been treated as a detrimental mechanism in the past. In a recent study it was found that martensite stabilization can be controlled by aging of stress-induced martensite, allowing development of a new class of high-temperature shape memory alloys. Symmetry-conforming adaptation of short-range order during thermal treatment has been stated to be the mechanism responsible for this phenomenon. However, direct experimental evidence for changes in short-range ordering has not been presented. The current study has been conducted in order to fill this gap. A Co-Ni-Ga shape memory alloy has been studied by neutron diffraction in different conditions, i.e. as-grown austenite, quenched martensite, heat-treated austenite and stabilized stress-induced martensite. The results obtained unequivocally reveal that martensite stabilization is triggered by a chemical disordering mechanism. Thus, the concept of symmetry-conforming short-range order proposed 1997 by Ren and Otsuka has finally found experimental verification for a Co-Ni-Ga alloy.

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