Title :
Phase transitions in intermetallic compounds Ni-Mn-Ga with shape memory effect
Author :
Dikshtein, Igor ; Koledov, Victor ; Shavrov, Vladimir ; Tulaikova, Alexandra ; Cherechukin, Alexander ; Buchelnikov, Vasily ; Khovailo, Vladimir ; Matsumoto, Minoru ; Takagi, Toshiyuki ; Tani, Junji
Author_Institution :
Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia
fDate :
9/1/1999 12:00:00 AM
Abstract :
The effect of a magnetic field on the formation of structural domains at martensitic transition in the intermetallic system Ni2+x Mn1-xGa was studied. For the compositions x whose temperatures of structural and magnetic transitions are close this effect is most pronounced. In the field of 0.2 to 1 T the increase in the transition temperature is linear with the coefficient of 0.015 K/T. Estimates of the transition temperature shift based on thermodynamic calculations are in good agreement with the experimental data. It is shown that the switching on the magnetic field at some critical temperature induces partial transformation of austenite into martensite
Keywords :
gallium alloys; magnetic transitions; manganese alloys; martensitic transformations; nickel alloys; shape memory effects; 0.2 to 1 T; Ni-Mn-Ga; austenite; critical temperature; intermetallic compounds; magnetic field effect; magnetic transitions; martensite; martensitic transition; partial transformation; phase transitions; shape memory effect; structural domains; structural transitions; switching; thermodynamic calculations; transition temperature; Intermetallic; Iron alloys; Magnetic domains; Magnetic fields; Magnetic susceptibility; Magnetoelasticity; Manganese alloys; Shape control; Shape memory alloys; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
