Over 7% magnetic field-induced strain in a Ni-Mn-Ga five-layered martensite

Abstract

Articles you may be interested inStress-and magnetic field-induced entropy changes in Fe-doped Ni-Mn-Ga shape-memory alloys Appl. Phys. Lett. 96, 071912 (2010); 10.1063/1.3309755Magnetic field effects on strain and resistivity during the martensitic transformation in Ni-Mn-Ga single crystals

Structural behavior and magnetic properties of a Ni–Mn–Ga single crystal across the martensite/austenite two-phase region

“…3a. The large 7% strain obtained at room temperature is consistent with the strain measured in a similar 10M Ni-Mn-Ga single crystal with high transformation temperature [30]. The 6% MFIS measured at 350 K is, however, an interesting result taking into account that it is measured, based on the DSC curves (Fig.…”

Magnetic phase transition and magnetocaloric effect in Mn–Fe–Ni–Ge ribbons

“…Large ÀDS m peak values of 68.7 and 73.6 J kg À1 K À1 under the field change of DB = 0-6.5 are obtained around 327 and 271 K for Fe6 and Fe8 samples, respectively. Further, we estimate the total entropy changes around FM/PM MST for these two ribbons from the DSC curves by using the equation DS T ¼ 1 [28,31], where dQ dt is the power of heat flow, dT dt is the cooling/heating rate, and T 1 and T 2 are the starting and finishing temperatures, as shown in Fig 3(c). The DS T values on heating are 79.3 and 92.5 J kg À1 K À1 of Fe6 and Fe8 ribbons, respectively.…”

The relation between lattice parameters and very low twinning stress in Ni50Mn25+xGa25−xmagnetic shape memory alloys

“…Theoretical analysis of Rajasekhara and Ferreira [28], and more detailed analysis of Wang and Sehitoglu [13] and Faran and Shilo [29] show that the twinning stress depends on the shear modulus, the interplanar spacing between the twinning planes, and the Burgers vector of the twin dislocations. The latter two depend on the lattice parameters, and the lattice parameters, in turn, change significantly with temperature [30,31,32,33].…”