Journal ArticleDOI
Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase
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In this paper, a magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase.Abstract:
Giant magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase. The strain proved to be caused by magnetic-field-controlled twin boundary motion. According to an analysis of x-ray diffraction data, the crystal structure of this phase is nearly orthorhombic, having lattice parameters a=0.619 nm, b=0.580 nm, and c=0.553 nm (in cubic parent phase coordinates) at ambient temperature. Seven-layer shuffling-type modulation along the (110)[110]p system was recorded. The results of mechanical tests and magnetic anisotropy property measurements are also reported.read more
Citations
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The influence of heat treatment on the magnetic and phase transformation properties of quaternary heusler alloy Ni50Mn8Fe17Ga25 ribbons
Z.H. Liu,Jing-Lin Chen,Haining Hu,Miao-Rong Zhang,X.F. Dai,Zhen-dong Zhu,Guodong Liu,Guangheng Wu,Fanbin Meng,Yangxian Li +9 more
TL;DR: The effect of heat treatment on the magnetic and phase transformation properties of Ni50Mn8Fe17Ga25 ribbon has been investigated in this article, where the effect of annealing was found to increase the martensitic transformation temperature, Curie temperature, and decrease the transformation hysteresis and magnetic hystresis due to the change of atomic chemical ordering.
Journal ArticleDOI
Anti-site disorder and improved functionality of Mn$_{2}$Ni{\it X} ({\it X}= Al, Ga, In, Sn) inverse Heusler alloys
TL;DR: In this article, the effects of chemical disorder on phase stabilities and magnetic properties using first-principles electronic structure methods were investigated, and it was shown that except for Mn$(2)$NiAl, all other alloys show signatures of martensitic transformations in presence of anti-site disorder at the sublattices with tetrahedral symmetry.
Journal ArticleDOI
Microstructure and phase transformations in a Ni50Mn29Ga16Gd5 alloy with a high transformation temperature
TL;DR: In this article, the microstructure and phase transformations in the Ni50Mn29Ga16Gd5 alloy have been investigated by scanning electron microscopy, transmission electron microscope, X-ray diffraction and differential scanning calorimetry.
Journal ArticleDOI
Site preference, electronic structure and possible martensitic transformation in Heusler alloys Ni2CoZ (Z = Al, Ga, In, Si, Ge, Sn, Sb)
Yuexing Ma,Zhaoning Ni,Hongzhi Luo,Hongzhi Luo,Heyan Liu,Fanbin Meng,Enke Liu,Wenhong Wang,Guangheng Wu +8 more
TL;DR: In this paper, the site preference, electronic structure, magnetic properties and martensitic transformation in Heusler alloys Ni 2 CoZ (Z = Al, Ga, In, Si, Ge, Sn, Sb) have been investigated by first-principles calculations.
Journal ArticleDOI
Effect of heating/cooling rate on martensitic transformation of NiMnGa-Co high temperature ferromagnetic shape memory alloys
TL;DR: In this article, a quench process, together with a high heating rate, improves the thermal response and stabilizes the thermo-elastic transformation in Co-doped samples; in addition, a low-rate thermal cycling is comparable to an austenitic aging.
References
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Journal ArticleDOI
Large magnetic‐field‐induced strains in Ni2MnGa single crystals
TL;DR: In this paper, the superelastic motion of twin boundaries in the martensitic phase of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K was found to be associated with the staining.
Journal ArticleDOI
6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni–Mn–Ga
TL;DR: In this paper, a simple model accounts quantitatively for the dependence of strain on magnetic field and external stress using as input parameters only measured quantities, and the strain versus field curves exhibit appreciable hysteresis associated with the motion of the twin boundaries.
Journal ArticleDOI
Magnetostriction of martensite
Richard D. James,Manfred Wuttig +1 more
TL;DR: In this article, a general strategy for inducing magnetostriction in ferromagnetic martensitic materials is described, and an analysis of domain redistribution caused by a magnetic field is given.
Journal ArticleDOI
Model for strain and magnetization in magnetic shape-memory alloys
TL;DR: In this paper, a simple phenomenological model for the magnetization process and field-induced strain by twin-boundary and phaseboundary motion is proposed for both the strong and weak anisotropy cases.
Journal ArticleDOI
Crystal structure of martensitic phases in Ni–Mn–Ga shape memory alloys
TL;DR: The crystal structures of the different martensitic phases observed in a wide variety of Ni-Mn-Ga alloy compositions have been studied in detail as discussed by the authors, and two approaches taken from the literature are analysed and discussed.