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Superelasticity in high strength heterophase single crystals of Ni51.0Ti36.5Hf12.5 alloy E. Y. Panchenko, Y. I. Chumlyakov, N. Y. Surikov [et.al.]

Contributor(s): Panchenko, Elena Yu | Surikov, N. Yu | Maier, Hans Jürgen | Gerstein, G | Sehitoglu, Huseyin | Chumlyakov, Yuri IMaterial type: ArticleArticleSubject(s): сплавы | сверхэластичность | мартенситные превращения | монокристаллы | титан | никель | гафнийGenre/Form: статьи в журналах Online resources: Click here to access online In: Technical physics letters Vol. 41, № 8. P. 797-800Abstract: The effect of precipitated disperse H-phase particles on the thermoelastic B2–B19′ martensitic transformation (MT) under compressive load has been studied on [001]-, [236]-, and [223]-oriented single crystals of Ni51.0Ti36.5Hf12.5 (at %) alloy in the initial (as-grown) state. It is established that, in Ni51.0Ti36.5Hf12.5 single crystals containing disperse H-phase particles with dimensions within 125–150 nm at a volume fraction of ~30%, neither the critical stresses of martensite formation nor superelasticity strain depend on the orientation. Fully reversible B2–B19′ MTs in Ni51.0Ti36.5Hf12.5 single crystals have been observed in tests at external axial stresses up to 1700 MPa and temperatures up to Tt ~ 373 K.
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The effect of precipitated disperse H-phase particles on the thermoelastic B2–B19′ martensitic transformation (MT) under compressive load has been studied on [001]-, [236]-, and [223]-oriented single crystals of Ni51.0Ti36.5Hf12.5 (at %) alloy in the initial (as-grown) state. It is established that, in Ni51.0Ti36.5Hf12.5 single crystals containing disperse H-phase particles with dimensions within 125–150 nm at a volume fraction of ~30%, neither the critical stresses of martensite formation nor superelasticity strain depend on the orientation. Fully reversible B2–B19′ MTs in Ni51.0Ti36.5Hf12.5 single crystals have been observed in tests at external axial stresses up to 1700 MPa and temperatures up to Tt ~ 373 K.

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