Martensite phase transformation and shape memory effect in a microwire alloy Ni-Ti

 

A. V. Petrov¹, V. A. Andreev², V. S. Kalashnikov¹, V. V. Koledov¹, V. G. Shavrov¹, D. V. Gunderov³

¹ Kotel'nikov Institute of Radio Engineering and Electronics of RAS

² "MATEK-SPF" Center

³ Institute of Molecule and Crystal Physics URC RAS

 

 The paper is received on December 24, 2015

 

Abstract. A study of the effect of heat treatment on phase transformation temperature of the sample microwire alloy 23 microns in diameter Ni50,5Ti49,5 obtained by drawing. It demonstrated that annealing 450⁰C in the originally amorphous microwires results in anomaly temperature dependence of the electric conductivity which is characteristic for the two-stage thermoelastic martensitic transition. The martensitic transition in the samples after annealing is observed in the range from -100 to 150⁰C. The annealed alloy samples showed shape memory effect (SME). We discuss the use of microwires SME in nanotechnology and technology of sensors and actuators.

Key words: shape memory alloys, thermoelastic martensite transformation, nickel titanium, micro wire.