J. Phys. IV France
Volume 112, October 2003
Page(s) 781 - 783

J. Phys. IV France
112 (2003) 781
DOI: 10.1051/jp4:2003998

Functional-mechanical properties and longevity of alloys on the base of titanium nickelide, under thermocyclings, in conditions of the system rigidity

M.A. Khusainov and O.Yu. Volnyanskaya

Novgorod State University, St. Peterburgskaya 41, V. Novgorod 173003, Russia

SMA elements were subjected to thermocycling in incomplete MT interval, under given rigidity of a counterspnng. It is shown that reactive forces developing, under heating, in incomplete MT interval ( $\rm\Delta T <20^\circ$C), depend on deformation value $\rm\varepsilon^M$ given in martensite. Linear dependence between stress and deformation $\rm\varepsilon^M$ is determined, where tangent of slope to horizontal axis characterizes the material property which is necessary to take into account when determining geometrical dimensions of thermoelement. Preliminary thermotraining of SMA elements promotes to increase reactance voltages and stabilize martensite structure. Elements subjected to thermotraining, have shown high workability during more than 10 6 thermocycles in the narrow enough temperature interval ( <20°C).

© EDP Sciences 2003