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On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys E. Acar, H. Tobe, H. E. Karaca, I. Chumlyakov

Contributor(s): Tobe, H | Karaca, Haluk E | Chumlyakov, Yuri I | Acar, EMaterial type: ArticleArticleSubject(s): эффект памяти формы | мартенситные превращенияGenre/Form: статьи в журналах Online resources: Click here to access online In: Materials science and engineering A Vol. 725. P. 51-56Abstract: The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [ 17]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.
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The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [ 17]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.

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