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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
V. Prieb and H. Steckmann
"1st Memory Alloys GmbH", Berlin, Germany
S. L. Prokoshkin
Moscow Technological University, Moscow, Russia
G. G. Zak and G. Z. Zatul'ski
National Technical University of Ukraine, Kiev, Ukraine
S. V. Shchukin
St. Petersburg State Technical University, St. Petersburg, Russia
Abstract: The features of the thermal and ferroelastic hysteresis arising in incomplete 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. As in the case of the ferroelastic straining of shape memory single crystals, a return
point memory effect (known as the SMART effect) is observed in incomplete cycles of transformation in the absence of external
stresses. The shift of the temperatures of the reverse transformation during the first heating in the free state
is investigated in samples subjected to a ferroelastic cyclic prestraining (known as the hysteresis-broadening effect).
It is found that upon cycling with a spiral-like decrease in the strain amplitude, the ferroelastic hysteresis
degenerates 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.
PII: S1063-7842(96)01011-2
doi:10.1134/1.1258548
PACS: 62.20.Dc, 44.50.+f, 81.30.Kf
MAIK "Nauka/Interperiodica" (Russia)
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Article (full script, english, PDF-file)
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