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Technical Physics -- November 1996 -- Volume 41, Issue 11, pp. 1137-1140

Thermoelasticity and hysteresis
of martensitic transformations in shape memory alloys.

II. Ferroelastic hysteresis in the straining of single crystals of copper-based shape memory alloys in the martensitic state


by V. Prieb

"1st Memory Alloys GmbH", Berlin, Germany

Abstract: The ferroelastic hysteresis in single crystals copper-based memory alloys in complete and partial tension-compression deformation cycles as well as the hysteresis interior are experimentally investigated.

It was found a line of the global equilibrium of the martensite variants as a line of turning points from internal elasticity to internal flow in partial cycles. It does not have a slope and is practically coincident with the axis of strain at zero stress. The ferroelastic hysteresis depends strongly on the single-crystal orientation and is completely independent of temperature.

It is shown experimentally for the first time that the ferroelastic and ferromagnetic hysteresis loops are similar to in the details of their interior. On this basis the hysteresis investigated in this paper is called ferroelastic.

Qualitative and quantitative characteristics are defined, experimentally measured, and calculated, along with such parameters of the ferroelastic hysteresis as the dissipative energy and its parabolic dependence on the ferroelastic strain, the coefficient of ferroelasticity, and the mechanical coercive force.

More:
"Investigation of SMA"
- collected articles (pdf-file)