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

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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.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16844, Tehran, Iran

    Majid Belbasi & Mohammad T. Salehi

  2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran

    Seyed Ali Asghar Akbari Mousavi

Authors
  1. Majid Belbasi
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  2. Mohammad T. Salehi
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  3. Seyed Ali Asghar Akbari Mousavi
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Correspondence to Majid Belbasi.

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Belbasi, M., Salehi, M.T. & Mousavi, S.A.A.A. Hot Deformation Behavior of NiTiHf Shape Memory Alloy Under Hot Compression Test. J. of Materi Eng and Perform 21, 2594–2599 (2012). https://doi.org/10.1007/s11665-012-0275-3

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  • DOI: https://doi.org/10.1007/s11665-012-0275-3

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