Open AccessShape memory effect and superelasticity in single crystal Ni54Fe19Ga27
Author(s) -
Zhuhong Liu,
Ma Xingqiao
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.028103
Subject(s) - pseudoelasticity , materials science , crystal twinning , shape memory alloy , diffusionless transformation , condensed matter physics , strain (injury) , magnetization , martensite , phase (matter) , magnetic shape memory alloy , magnetic field , magnetic anisotropy , composite material , physics , microstructure , medicine , quantum mechanics
Shape memory effect and superelasticity are studied in this paper. At room temperature, perfect strain plateaus of 3.3%, 2% and 3% are obtained in the [001], [110] and [111] directions. The energies required to induce the martensitic transformation in different crystallographic directions are estimated from the stress-strain results. Each of the magnetization curves in the martensitic phase indicates that a magnetic anisotropy energy density Ku = (1/2)MsHa =4.8× 105 erg/cm3, which is far smaller than the mechanical driving force for variants twinning. This interpretes why only a little magnetic field induced strain in NiFeGa alloy has been observed so far.