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Journal of Materials Engineering and Performance

, Volume 21, Issue 12, pp 2594–2599 | Cite as

Hot Deformation Behavior of NiTiHf Shape Memory Alloy Under Hot Compression Test

  • Majid Belbasi
  • Mohammad T. Salehi
  • Seyed Ali Asghar Akbari Mousavi
Article

Abstract

In this study, the hot deformation behavior of Ni49Ti36Hf15 alloy was investigated. Compression tests were carried out at temperatures ranging from 800 to 1100 °C and at the strain rates of 0.001–1/s. The peak stress decreases with increasing deformation temperature and decreasing strain rate, a behavior which can be described by plotting the Zener-Hollomon parameter as a function of stress. It was realized that dynamic recrystallization (DRX) was responsible for flow softening. Most of the samples exhibited typical DRX stress-strain curves with a single peak stress followed by a gradual fall down stress. Microstructure evolution showed that new recrystallized grains formed in the vicinity of grain boundaries. The hyperbolic-sine-type constitutive model of Ni49Ti36Hf15 alloy was obtained to provide basic data for determining reasonable hot-forming process. The activation energy for hot deformation of the Ni49Ti36Hf15 alloy was close to 410 kJ/mol.

Keywords

casting intermetallics rolling 

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Majid Belbasi
    • 1
  • Mohammad T. Salehi
    • 1
  • Seyed Ali Asghar Akbari Mousavi
    • 2
  1. 1.School of Metallurgy and Materials EngineeringIran University of Science and TechnologyTehranIran
  2. 2.School of Metallurgy and Materials Engineering, College of EngineeringUniversity of TehranTehranIran

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