Open AccessАнизотропия деформации памяти формы в монокристалле сплава Ni-=SUB=-49-=/SUB=-Fe-=SUB=-18-=/SUB=-Ga-=SUB=-27-=/SUB=-Co-=SUB=-6-=/SUB=-
Author(s) -
В. И. Николаев,
А. В. Солдатов,
R. B. Timashov,
V. M. Krymov
Publication year - 2020
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2020.03.48982.18081
Subject(s) - materials science , perpendicular , strain (injury) , deformation (meteorology) , compression (physics) , orientation (vector space) , crystallography , condensed matter physics , phase (matter) , crystal (programming language) , single crystal , composite material , geometry , chemistry , physics , mathematics , medicine , organic chemistry , computer science , programming language
Stress-strain behavior of a cubic-shaped Ni49Fe18Ga27Co6 shape memory single crystal uniaxially compressed in three directions perpendicular to its faces was studied. The crystallographic orientation of the sample was chosen so that the sample was deformed along two А and one [001]А directions. A fundamentally different stress-strain behavior was observed for the deformations along A and [001]A directions. At room temperature, irrespective of the magnitude of the phase strain, the crystal compressed in [001]A exhibited superelastic behavior i.e. the strain fully recovered after unloading. In contrast, deformation along A directions to the strain levels above 4% induced a residual shape memory strain after the unloading. Strains measured along the directions perpendicular to the compression axis indicate an anomalous behavior of the Poisson's ratio.