J. Phys. IV France 112 (2003) 799
DOI: 10.1051/jp4:20031002

The shape memory effect and superelasticity in nickel-titanium single crystals aged under applied stress

Yu.I. Chumlyakov¹, E.Yu. Panchenko¹, I.V. Kireeva¹, D.A. Shaporov¹, V.B. Aksenov¹, H. Sehitoglu², I. Karaman³, K. Gall⁴ and H. Maier<sup>5

1</sup>  Siberian Physico-Technical Institute, Novosobomaya Sq. 1, Tomsk 634050, Russia
²  University of Illinois, Department of Mechanical and Industrial Engineering, Urbana, IL 61701, U.S.A.
³  Texas A&M University, Department of Mechanical and Industrial Engineering, 326 Engineering/Physics Building, 3123 TAMU, Texas 77843-3123, U.S.A.
⁴  University of Colorado, Department of Mechanical Engineering, ECME 279, Campus Box 427, Boulder, CO 80309-427, U.S.A.
⁵  University of Padernbom, Lehrstuhl f. Werkstoffkunde, FB 10, Pohiwed 47-49, 33098 Pademborn, Germany

Abstract
Aging under applied stress of <111 > and <122 > Ti-51at.%Ni single crystals leads to the formation of one crystallographic variant of Ti ₃Ni ₄ particles, but after aging without stress four particle variants are observed. It bas been shown that the values of shape memory effect and superelasticity are dependent on the number of precipitate variants and particle sizes.

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