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Precipitation processes in near-equiatomic TiNi shape memory alloys

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Abstract

Metallographic studies have been made of precipitation processes in Ti-50 pct Ni and Ti-52 pct Ni (at. pct) shape memory alloys. The eutectoid and peritectoid reactions previously reported for near-equiatomic and Ni-rich TiNi alloys were not observed for either composition. In the Ti-52Ni alloy, diffusional transformations take place, similar to those in supersaturated alloys. The precipitation sequence can be written asβ 0 → Ti11Ni14 → Ti2Ni3 → TiNi3. The solidus line of the TiNi phase in the Ti-52Ni alloy lies at 812 ± 22 °C. Morphological characteristics of the various precipitate phases are described in detail.

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Authors and Affiliations

  1. Department of Metallurgy, Kumamoto University, Kumamoto, Japan

    M. Nishida

  2. Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois, 61801, Urbana, IL

    C. M. Wayman

  3. Research Institute of Mineral Dressing and Metallurgy, Tohoku University, Sendai, Japan

    T. Honma

Authors
  1. M. Nishida
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  2. C. M. Wayman
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  3. T. Honma
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M. NISHIDA, formerly with the University of Illinois

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Nishida, M., Wayman, C.M. & Honma, T. Precipitation processes in near-equiatomic TiNi shape memory alloys. Metall Trans A 17, 1505–1515 (1986). https://doi.org/10.1007/BF02650086

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  • DOI: https://doi.org/10.1007/BF02650086

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