Функциональная усталость сплавов с эффектом памяти формы систем Ni-Mn-Ga и Ni-Ti в условиях термоциклирования под постоянной нагрузкой

Abstract

A comparative study of the functional properties and functional fatigue of Ni-Mn-Ga alloys in the initial cast state and Ni-Ti alloys in the initial hot-forged state without heat treatment was carried out. Measurements were carried out using experimental technique of three-point bending of samples in the form of plates of ~ 0.7 mm x 10 mm x 1.5 mm. It is shown that Ni2MnGa alloy in the cast state is preferably used for lightly loaded actuators (up to 100 MPa) and reversible deformations (up to 1.5%) in the temperature range from -85 C to -75 C; Ni-Ti system alloy in hot-forged state is recommended for highly loaded actuators (up to 500 MPa) , high reversible deformations (up to 8.5%) in the temperature range from -40 C to 40 C.