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One-way and two-way shape memory effect in single-phase CoNiGa single crystals I. Kuksgauzen, I. Kireeva, Y. Chumlyakov, H. Maier

Contributor(s): Kuksgauzen, Irina V | Chumlyakov, Yuri I | Maier, Hans Jürgen | Kireeva, Irina V. физикMaterial type: ArticleArticleSubject(s): монокристаллы | двусторонняя память формы | сверхэластичность | мартенситные превращенияGenre/Form: статьи в журналах Online resources: Click here to access online In: Materials today: proceedings Vol. 4, № 3, Part B. P. 4784-4788Abstract: On single-phase [1¯23] -oriented single crystals of ferromagnetic Co49Ni21Ga30 (at.%) alloy shape memory effect (SME) and superelasticity (SE) in compression are studied. The value of SME and SE are both equal to −3.2%. SE is observed in the temperature range of T=318–473 K. After realization of SE in [1¯23] -oriented crystals the two-way SME was found. Two-way SME is equal in value to one-way SME, SE and the lattice stain, |ε0|, for the crystals of a given orientation at B2–L10 martensitic transformation (MT) under compression deformation. The physical reason for the existence of the two-way SME in [1¯23] -oriented crystals after realization of SE is associated with the occurrence of internal stress fields due to the appearance of the crystal structure defects at T>423 K.
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On single-phase [1¯23] -oriented single crystals of ferromagnetic Co49Ni21Ga30 (at.%) alloy shape memory effect (SME) and superelasticity (SE) in compression are studied. The value of SME and SE are both equal to −3.2%. SE is observed in the temperature range of T=318–473 K. After realization of SE in [1¯23] -oriented crystals the two-way SME was found. Two-way SME is equal in value to one-way SME, SE and the lattice stain, |ε0|, for the crystals of a given orientation at B2–L10 martensitic transformation (MT) under compression deformation. The physical reason for the existence of the two-way SME in [1¯23] -oriented crystals after realization of SE is associated with the occurrence of internal stress fields due to the appearance of the crystal structure defects at T>423 K.

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