Isothermal Martensitic Transformations in an Aged Ni-Rich Ti–Ni Alloy Containing Coherent Ti3Ni4 Particles

Hiroshi Akamine; Yohei Soejima; Tadaaki Nakamura; Farjami Sahar; Takashi Fukuda; Tomoyuki Kakeshita; Minoru Nishida

doi:10.2320/matertrans.MT-MJ2019004

Special Issue on New Aspects of Martensitic Transformations II

Isothermal Martensitic Transformations in an Aged Ni-Rich Ti–Ni Alloy Containing Coherent Ti₃Ni₄ Particles

Hiroshi Akamine, Yohei Soejima, Tadaaki Nakamura, Farjami Sahar, Takashi Fukuda, Tomoyuki Kakeshita, Minoru Nishida

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Keywords: shape memory alloys, titanium–nickel alloy, scanning electron microscopy, martensitic phase transformation, precipitation

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2020 Volume 61 Issue 1 Pages 37-41

DOI https://doi.org/10.2320/matertrans.MT-MJ2019004

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Abstract

The time dependence nature of B2 (ordered cubic) to R (trigonal) and R to B19′ (monoclinic) martensitic transformations in an aged Ni-rich Ti–Ni alloy was investigated by electrical resistivity measurements. Both B2 to R and R to B19′ transformations exhibit time dependence nature in the aged alloy containing coherent lenticular Ti₃Ni₄ precipitates with an average diameter of about 110 nm. However, the successive B2-R-B19′ isothermal transformation is not detected by electrical resistivity measurements. The isothermal R-B19′ transformation is visualized by in situ scanning electron microscopy (SEM) observations.

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