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The Effect of Deformation Heating on Restoration and Constitutive Equation of a Wrought Equi-Atomic NiTi Alloy

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Abstract

In this study, a set of constitutive equation corrected for deformation heating is proposed for a near equi-atomic NiTi shape memory alloy using isothermal hot compression tests in temperature range of 700 to 1000 °C and strain rate of 0.001 to 1 s−1. In order to determine the temperature rise due to deformation heating, Abaqus simulation was employed and varied thermal properties were considered in the simulation. The results of hot compression tests showed that at low pre-set temperatures and high strain rates the flow curves exhibit a softening, while after correction of deformation heating the softening is vanished. Using the corrected flow curves, the power-law constitutive equation of the alloy was established and the variation of constitutive constants with strain was determined. Moreover, it was found that deformation heating introduces an average relative error of about 9.5% at temperature of 800 °C and strain rate of 0.1 s−1. The very good agreement between the fitted flow stress (by constitutive equation) and the measured ones indicates the accuracy of the constitutive equation in analyzing the hot deformation behavior of equi-atomic NiTi alloy.

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Acknowledgments

The authors would like to thank the Sharif University of Technology, Tehran, Iran for the financial support and provision of the research facilities used in this study.

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Authors and Affiliations

  1. Department of Metallurgy, Saveh-Branch, Islamic Azad University, Saveh, Iran

    A. Ahadi & I. S. Sarraf

  2. Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, Tehran, Iran

    A. Ahadi, A. Karimi Taheri & I. S. Sarraf

  3. Department of Mechanical and Aerospace Engineering, Science and Research-Branch, Islamic Azad University, Tehran, Iran

    K. Karimi Taheri

  4. KNT University, Tehran, Iran

    S. M. Abbasi

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  1. A. Ahadi
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  2. A. Karimi Taheri
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  3. K. Karimi Taheri
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  4. I. S. Sarraf
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  5. S. M. Abbasi
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Correspondence to A. Karimi Taheri.

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Ahadi, A., Karimi Taheri, A., Karimi Taheri, K. et al. The Effect of Deformation Heating on Restoration and Constitutive Equation of a Wrought Equi-Atomic NiTi Alloy. J. of Materi Eng and Perform 21, 516–523 (2012). https://doi.org/10.1007/s11665-011-9936-x

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  • DOI: https://doi.org/10.1007/s11665-011-9936-x

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