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Technical Physics -- November 1996 -- Volume 41, Issue 11, pp. 1141-1144

Thermoelasticity and hysteresis
of martensitic transformations in shape memory alloys.

III. Features of the hysteretic behavior


by V. Prieb

Abstract: The features of the thermal and ferroelastic hysteresis arising in partial cycling and after a cyclic ferroelastic straining of single crystals of various shape memory alloys are investigated by means of calorimetry and mechanical tension-compression testing.

It was found the return point memory effect (known as the SMART effect) in partial cycles of revers transformation in the absence of external stresses, the shift of the temperatures of the reverse transformation during the first heating in the free state in samples subjected to a ferroelastic cyclic prestraining (known as the hysteresis-broadening or martensit stabilization effect), the degeneration of the ferroelastic hysteresis during cycling with a spiral-like decreasing of strain amplitude, into a single line corresponding to the elasticity of martensite, and the similarity of the internal hysteresis loops is destroyed.

Based on the experimental studies, general rules are formulated for the evolution of the ``internal'' trajectories. Such rules are needed for modeling the change in hysteresis of the shape memory effect.

More:
"Calorimetry of shape memory alloys"
- collected articles (pdf-file)