Open AccessPseudoelasticity of Co50Ni22Ga28:Fex single crystal at room temperature and high temperature of 100℃
Author(s) -
Dai Xue-Fang,
Guodong Liu,
Zhuhong Liu,
Guangheng Wu,
Jinglan Chen
Publication year - 2005
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.54.4884
Subject(s) - materials science , single crystal , torsion (gastropod) , pseudoelasticity , anisotropy , crystallography , condensed matter physics , thermodynamics , composite material , optics , chemistry , physics , martensite , microstructure , medicine , surgery
The pseudo-quaternary Heusler alloys Co50Ni22Ga28:Fex (x0,1.5,2,2.5) single crystals have been synthesized. Excell ent pseudoelasticities were observed in compression, bending and torsion. At roo m temperature, the perfect pseudoelastic strains of 4% and 6.7% were obtained in the 100 and 110 directions of the Co50Ni22Ga 28:Fe2 single crystal under compression, respectively. The stre ss-strain curve for the Co50Ni22Ga28:Fe1.5 single crystals shows an indistinct platform on loading, and an intermar tensitic transformation occurs with unloading. The platform of the curve on load ing becomes clear and the intermartensitic transformation with unloading becomes indistinct at the high temperature of 100℃. Pseudoelastic strains of 5.5% wer e obtained in the 001 direction of the Co50Ni22Ga 28 :Fe2.5 single crystal. In addition, the single crystals show strong elastic anisotropy.