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Microstructural evolution in a Ti – Ta high-temperature shape memory alloy during creep

  • Ramona Rynko , Axel Marquardt , Alexander Paulsen , Jan Frenzel , Christoph Somsen and Gunther Eggeler
Published/Copyright: April 23, 2015
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 106 Issue 4

Abstract

Alloys based on the titanium–tantalum system are considered for application as high-temperature shape memory alloys due to their martensite start temperatures, which can surpass 200 °C. In the present work we study the evolution of microstructure and the influence of creep on the phase transformation behavior of a Ti70Ta30 (at.%) high-temperature shape memory alloy. Creep tests were performed in a temperature range from 470 to 530 °C at stresses between 90 and 150 MPa. The activation energy for creep was found to be 307 kJ mol−1 and the stress exponent n was determined as 3.7. Scanning and transmission electron microscopy investigations were carried out to characterize the microstructure before and after creep. It was found that the microstructural evolution during creep suppresses subsequent martensitic phase transformations.

Keywords: Ti – Ta; High-temperature shape memory alloy (HT-SMA); Martensitic transformation; Creep
* Correspondence address, Ramona Rynko, M. Sc., Lehrstuhl Werkstoffwissenschaft, Institut für Werkstoffe, Fakultät für Maschinenbau, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Germany, Tel.: +49(0)234-32-27898, E-mail:

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Received: 2014-09-04
Accepted: 2014-11-06
Published Online: 2015-04-23
Published in Print: 2015-04-14

© 2015, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111189
Keywords for this article
Ti – Ta; High-temperature shape memory alloy (HT-SMA); Martensitic transformation; Creep

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Microstructural evolution in a Ti – Ta high-temperature shape memory alloy during creep
  5. Microstructural changes in quasicrystalline Al–Mn–Be–Cu alloy after various heat treatments
  6. Sulfur solubility of liquid and solid Fe–Cr alloys: A thermodynamic analysis
  7. Thermophysical properties of solid phase ruthenium measured by the pulse calorimetry technique over a wide temperature range
  8. Electrochemical characteristics of nanocrystalline and amorphous Mg–Y–Ni-based Mg2Ni-type alloys prepared by mechanical milling
  9. Metallurgical characteristics and machining performance of nanostructured TNN-coated tungsten carbide tool
  10. Ultrasonic cavitation erosion of a duplex treated 16MnCr5 steel
  11. Electrocapacitance of hybrid film based on graphene oxide reduced by ascorbic acid
  12. Influence of fabrication parameters on the nanostructure of Si-NWs under HF/Fe(NO3)3 etching system
  13. Template assisted synthesis of poly(3-hexylthiophene) nanorods and nanotubes: growth mechanism and corresponding band gap
  14. Short Communications
  15. Fabrication and microstructure of nano-SiC/Ni composite coatings on diamond surface via electro-co-deposition
  16. A comparative study on the friction and wear properties of semi-solid cast A356 alloy
  17. People
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  19. DGM News
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