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Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy

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Abstract

In this article, the effect of aging on the microstructure and shape memory effect (SME) of a hot-rolled Ni49Ti36Hf15 alloy is studied. The alloy was prepared by vacuum induction melting (VIM) and homogenized at 1000 °C for 2 h. The homogenized alloy was then undergone 45% hot rolling at 850 °C and aging at temperatures of 500 and 600 °C for 2 h. Optical microscopy (OM) and scanning electron microscopy (SEM) conducted on the hot-rolled samples revealed that hot rolling improves microstructure, deformation, and recoverable strains such that the alloy recovers 3.10 of 3.23 and 5.61 of 6.25 strain in the homogenized and hot-rolled state, respectively. Aging, however, adversely affects the formability and SME of the alloy, which stems from the embrittling effect of the newly formed precipitates during the aging process.

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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

    Mahdi Moshref Javadi, Majid Belbasi & Mohammad T. Salehi

  2. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, 14778-93855, Iran

    M. Reza Afshar

Authors
  1. Mahdi Moshref Javadi
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  2. Majid Belbasi
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  3. Mohammad T. Salehi
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  4. M. Reza Afshar
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Corresponding author

Correspondence to Mohammad T. Salehi.

Additional information

This article is an invited paper selected from presentations at Shape Memory and Superelastic Technologies 2010, held May 16-20, 2010, in Pacific Grove, California, and has been expanded from the original presentation.

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Javadi, M.M., Belbasi, M., Salehi, M.T. et al. Effect of Aging on the Microstructure and Shape Memory Effect of a Hot-Rolled NiTiHf Alloy. J. of Materi Eng and Perform 20, 618–622 (2011). https://doi.org/10.1007/s11665-011-9885-4

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  • DOI: https://doi.org/10.1007/s11665-011-9885-4

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