Mein Praesentationsbild - Berlin, 2008.

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Influence of the structure and orientation of the parent phase on the hysteresis of single-crystal shape memory alloys.

V. Prieb
TU-Berlin, Germany
(J. de Phys., 5(1995)C8-C913 -
Proc. of the Int. Conf. on the Mart. Transf. "ICOMAT-95")



Abstract: The result of high-resolution elektron microscopy, calorimetryand tension-compression tests on the Cu-Zn-Al single crystals, of calorimetry on the Mn-Cu, NiTi single crystals and on the NiTi polycristals are presented. Features of the pseudo-plastic (ferroelastic) hysteresis at the deformation of single crystals in martensitic state are investigated in detail. The dissipated enrgy in one cycle of ferroelastic deformation shows parabolic dependence on the strain with a proportionality coeffitient, which is determinated as an effective modulus of the martensitic polydomain.

The hysteresis of the thermal induced, stress-free transformation of all samples is also investigated. Two equilibrium lines brecketing an internal latent hysteresis loop inside the major hysteresis loop are found during partial cycling. Influence of the transformation type, polycristallinity and the scanning rate on the thermal hysteresis are discussed.

More about this in my monograph, published in November 2020:
"The concept of dual-energetic martensite (CODEM) for shape memory phenomena", PDF-file