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A study on the pseudoelasticity of low temperature aged and thermomechanically treated Ti-51.5 at.% Ni shape memory alloy

  • Mehrdad Karimzadeh , Mohammad Reza Aboutalebi , Mohammad Taghi Salehi , Seyyed Mahdi Abbasi and Maryam Morakabati
Published/Copyright: December 5, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 12

Abstract

The aim of the present work is to investigate the effects of low temperature aging and thermomechanical treatments on the transformation and deformation behavior of an Ni-rich NiTi alloy. One sample of solution treated Ti-51.5 at.% Ni shape memory alloy was aged at 300°C for 1 hr. The other solution annealed sample, was firstly cold rolled to a reduction of 20% and then aged at 300°C for 1 hr. Applying these treatments, samples showed R-phase transformations in the absence of B19′ phase formation according to differential scanning calorimetry curves. By applying 20% cold reduction in area prior to aging, almost complete recovery of strain was observed and pseudoelasticity improved significantly compared to the conventional aged sample. Results of thermal analysis and tensile tests suggest that the observed pseudoelasticity for the thermomechanically treated sample can be due to stress-induced formation of R-phase. It is proposed that if stress-induced transformation of B19′ phase does not take place, stress-induced transformation of R-phase can extend to higher than 1% strain. Hence, pseudoelastic behavior due to this transformation can be observed.

Keywords: NiTi shape memory alloys; R-phase; Stress-induced transformation; Pseudoelasticity
* Correspondence address, Mehrdad Karimzadeh, Center of Excellence for High Strength Alloys Technology (CEHSAT), Iran University of Science and Technology (IUST), Narmak, Tehran, 1684613114, Iran, Tel.: +989128822146, Fax: +982177240480, E-mail: ,

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Received: 2014-04-18
Accepted: 2014-07-25
Published Online: 2014-12-05
Published in Print: 2014-12-08

© 2014, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111136
Keywords for this article
NiTi shape memory alloys; R-phase; Stress-induced transformation; Pseudoelasticity

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. On the orientation dependence of grain boundary triple line energy in Cu
  5. Hydrogen storage kinetics of as-cast and spun (Mg24Ni10Cu2)100–xNdx (x = 0–20) alloys
  6. Segregation of phosphorus to ferrite grain boundaries during transformation in an Fe–P alloy
  7. A study on the pseudoelasticity of low temperature aged and thermomechanically treated Ti-51.5 at.% Ni shape memory alloy
  8. Experimental determination and thermodynamic calculation of the phase equilibria in the Co–Mn–Ta system
  9. 800°C isothermal section of the Co–Cr–Mo–Si quaternary system
  10. Phase fraction mapping in the as-cast microstructure of extrudable 6xxx aluminum alloys
  11. Effect of thixoforming on morphological changes in iron-bearing intermetallics and mechanical properties of Al–Si–Cu alloys
  12. The superplasticity of friction stir processed Al-5Mg alloy with additions of scandium and zirconium
  13. Short Communications
  14. Anti-corrosion behaviour of VE/GF coatings on mild steel
  15. Intermetallic phase stabilized Al/Pb metallic emulsion
  16. Synthesis of ultrafine powder (W,Ti)C by microwave heating in a stream of argon
  17. Fabrication and properties of porous silicon nitride ceramics via microwave sintering
  18. DGM News
  19. Personal
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