On the high cyclic stability of the tensile two-way shape memory effect in stress-induced martensite aged Co35Ni35Al30 single crystals A. S. Eftifeeva, E. Y. Panchenko, Y. I. Chumlyakov [et al.]
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ArticleContent type: Текст Media type: электронный Subject(s): мартенситное превращение | мартенситное старение | стабилизация мартенсита | двусторонний эффект памяти формы | циклическая стабильностьGenre/Form: статьи в журналах Online resources: Click here to access online
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Materials science and engineering A Vol. 799. P. 140166 (1-9)Abstract: A stable tensile two-way shape memory effect with a strain of (+7.0 ±0.3) % along the [001]B2-direction upon stress-induced martensite ageing was obtained for single crystals of an Co35Ni35Al30 ferromagnetic alloy. Stress- induced martensite ageing at 398 K for 1.0 h under a compressive stress of 500 MPa along the [110]B2-direction led to the stabilization of L10-martensite variant, which contributes to sample elongation along the [001]B2- direction during stress-free cooling and reversible recovery upon subsequent heating. The tensile two-way shape memory effect was observed to be stable during stress-free thermal cycling through the phase transformation range. The characteristics of the two-way shape memory effect (reversible strain, martensitic transformation temperatures, and thermal hysteresis) did not change during 100 thermal cycles. The characteristics of the tensile two-way shape memory effect remain unchanged even after superelasticity cycling under a compressive stress of 1025 MPa applied along the [001]B2-direction at a temperature of 423 K, which is close to the stress-induced martensite ageing temperature.
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A stable tensile two-way shape memory effect with a strain of (+7.0 ±0.3) % along the [001]B2-direction upon stress-induced martensite ageing was obtained for single crystals of an Co35Ni35Al30 ferromagnetic alloy. Stress- induced martensite ageing at 398 K for 1.0 h under a compressive stress of 500 MPa along the [110]B2-direction led to the stabilization of L10-martensite variant, which contributes to sample elongation along the [001]B2- direction during stress-free cooling and reversible recovery upon subsequent heating. The tensile two-way shape memory effect was observed to be stable during stress-free thermal cycling through the phase transformation range. The characteristics of the two-way shape memory effect (reversible strain, martensitic transformation temperatures, and thermal hysteresis) did not change during 100 thermal cycles. The characteristics of the tensile two-way shape memory effect remain unchanged even after superelasticity cycling under a compressive stress of 1025 MPa applied along the [001]B2-direction at a temperature of 423 K, which is close to the stress-induced martensite ageing temperature.
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