Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Malte Vollmer
  • Philipp Krooß
  • Christian Segel
  • Anja Weidner
  • Alexander Paulsen
  • Jan Frenzel
  • Mirko Schaper
  • Gunther Eggeler
  • Hans Jürgen Maier
  • Thomas Niendorf

Research Organisations

External Research Organisations

  • TU Bergakademie Freiberg - University of Resources
  • Ruhr-Universität Bochum
  • Paderborn University
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Details

Original languageEnglish
Pages (from-to)288-295
Number of pages8
JournalJournal of alloys and compounds
Volume633
Publication statusPublished - 7 Feb 2015

Abstract

Due to its transformation behavior, Co-Ni-Ga represents a very promising high temperature shape memory alloy (HT SMA) for applications at elevated temperatures. Co-Ni-Ga single crystals show a fully reversible pseudoelastic shape change up to temperatures of 400 °C. Unfortunately, polycrystalline Co-Ni-Ga suffers from brittleness and early fracture mainly due to intergranular constraints. In the current study, different thermo-mechanical processing routes produced various microstructures which differ in grain size and texture. A bicrystalline bamboo-like grain structure results in the highest reversible transformation strains and excellent cyclic stability. Moreover, solution-annealed and hot-rolled conditions also showed cyclic stability. Using in situ high-resolution electron microscopy, the elementary processes, which govern the microstructural evolution during pseudoelastic cycling were investigated and the mechanisms that govern structural and functional degradation were identified. The observations documented in the present work suggest that the formation of the ductile γ-phase on and near grain boundaries as well as the activation of multiple martensite variants at grain boundaries are beneficial for improved cyclic performance of polycrystalline Co-Ni-Ga HT SMAs.

Keywords

    Crack formation, In situ testing, Martensitic transformation, Microstructure, Superelasticity

ASJC Scopus subject areas

Cite this

Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys. / Vollmer, Malte; Krooß, Philipp; Segel, Christian et al.
In: Journal of alloys and compounds, Vol. 633, 07.02.2015, p. 288-295.

Research output: Contribution to journalArticleResearchpeer review

Vollmer, M, Krooß, P, Segel, C, Weidner, A, Paulsen, A, Frenzel, J, Schaper, M, Eggeler, G, Maier, HJ & Niendorf, T 2015, 'Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys', Journal of alloys and compounds, vol. 633, pp. 288-295. https://doi.org/10.1016/j.jallcom.2015.01.282
Vollmer, M., Krooß, P., Segel, C., Weidner, A., Paulsen, A., Frenzel, J., Schaper, M., Eggeler, G., Maier, H. J., & Niendorf, T. (2015). Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys. Journal of alloys and compounds, 633, 288-295. https://doi.org/10.1016/j.jallcom.2015.01.282
Vollmer M, Krooß P, Segel C, Weidner A, Paulsen A, Frenzel J et al. Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys. Journal of alloys and compounds. 2015 Feb 7;633:288-295. doi: 10.1016/j.jallcom.2015.01.282
Vollmer, Malte ; Krooß, Philipp ; Segel, Christian et al. / Damage evolution in pseudoelastic polycrystalline Co-Ni-Ga high-temperature shape memory alloys. In: Journal of alloys and compounds. 2015 ; Vol. 633. pp. 288-295.
Download
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AU - Vollmer, Malte

AU - Krooß, Philipp

AU - Segel, Christian

AU - Weidner, Anja

AU - Paulsen, Alexander

AU - Frenzel, Jan

AU - Schaper, Mirko

AU - Eggeler, Gunther

AU - Maier, Hans Jürgen

AU - Niendorf, Thomas

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PY - 2015/2/7

Y1 - 2015/2/7

N2 - Due to its transformation behavior, Co-Ni-Ga represents a very promising high temperature shape memory alloy (HT SMA) for applications at elevated temperatures. Co-Ni-Ga single crystals show a fully reversible pseudoelastic shape change up to temperatures of 400 °C. Unfortunately, polycrystalline Co-Ni-Ga suffers from brittleness and early fracture mainly due to intergranular constraints. In the current study, different thermo-mechanical processing routes produced various microstructures which differ in grain size and texture. A bicrystalline bamboo-like grain structure results in the highest reversible transformation strains and excellent cyclic stability. Moreover, solution-annealed and hot-rolled conditions also showed cyclic stability. Using in situ high-resolution electron microscopy, the elementary processes, which govern the microstructural evolution during pseudoelastic cycling were investigated and the mechanisms that govern structural and functional degradation were identified. The observations documented in the present work suggest that the formation of the ductile γ-phase on and near grain boundaries as well as the activation of multiple martensite variants at grain boundaries are beneficial for improved cyclic performance of polycrystalline Co-Ni-Ga HT SMAs.

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