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On the Oxidation Behavior and Its Influence on the Martensitic Transformation of Ti–Ta High-Temperature Shape Memory Alloys

  • Dennis LangenkämperEmail author
  • Alexander Paulsen
  • Christoph Somsen
  • Jan Frenzel
  • Gunther Eggeler
SPECIAL ISSUE: HTSMA 2018, INVITED PAPER
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Abstract

In the present work, the influence of oxidation on the martensitic transformation in Ti–Ta high-temperature shape memory alloys is investigated. Thermogravimetric analysis in combination with microstructural investigations by scanning electron microscopy and transmission electron microscopy were performed after oxidation at 850 °C and at temperatures in the application regime of 450 °C and 330 °C for 100 h, respectively. At 850 °C, internal oxidation results in the formation of a mixed layered scale of TiO2 and β-Ta2O5, associated with decomposition into Ta-rich bcc β-phase and Ti-rich hexagonal α-phase in the alloy. This leads to a suppression of the martensitic phase transformation. In addition, energy dispersive X-ray analysis suggests an oxygen stabilization of the α-phase. At 450 °C, a slow decomposition into Ta-rich β-phase and Ti-rich α-phase is observed. After oxidation at 330 °C, the austenitic matrix shows strong precipitation of the ω-phase that suppresses the martensitic transformation on cooling.

Keywords

HTSMA Ti–Ta Oxidation TEM Martensite Austenite 

Notes

Acknowledgements

Financial support by Deutsche Forschungsgemeinschaft within the Research Unit Program 1766 “Hochtemperatur-Formgedächtnislegierungen” (Project Nos.: 200999873, TP1 and TP2) is gratefully acknowledged.

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Dennis Langenkämper
    • 1
    Email author
  • Alexander Paulsen
    • 1
  • Christoph Somsen
    • 1
  • Jan Frenzel
    • 1
  • Gunther Eggeler
    • 1
  1. 1.Institut für WerkstoffeRuhr-Universität BochumBochumGermany

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