Transformation History Dependence of Shape Memory Effects

P. Sittner; V. Novák; M. Takakura; M. Tokuda

doi:doi:10.1051/jp4:1997591

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Numéro		J. Phys. IV France Volume 07, Numéro C5, November 1997 IV^th European Symposium on Martensitic Transformations


Page(s)		C5-573 - C5-578
DOI		https://doi.org/10.1051/jp4:1997591

IV^th European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-573-C5-578
DOI: 10.1051/jp4:1997591

Transformation History Dependence of Shape Memory Effects

P. Sittner¹, V. Novák¹, M. Takakura² and M. Tokuda²

¹ Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8, 18040 Czech Republic
² Faculty of Engineering, Mie University Kamihama-cho 1515, Tsu, Mie 514, Japan

Abstract
Calorimetric and thermomechanical experiments with single crystals and polycrystals of CuAlZnMn shape memory alloy show how the reverse martensitic transformation - shape memory effect - is affected by the forward transformation history, in particular by the: i) transformation path from austenite to martensite, ii) deformation in martensite, iii) annealing in martensite under stress. It is suggested that a shape memory alloy is able to partially keep information about the forward transformation history encoded in the complex rnartensite variant microstructure. Effects of the transformation history appear, particularly, if the reverse martensitic transformation proceeds under bias external stress.