L. Zuo

Microstructure and magnetocaloric effect of melt-spun Ni52Mn26Ga22 ribbon

Microstructural features and magnetocaloric properties of Ni52Mn26Ga22 melt-spun ribbons were studied. Results show that there are four types of differently oriented variants of seven-layered modulated (7M) martensite at room temperature, being twin-related one another and clustered in colonies. Due to the coupled magnetic and structural transformations between parent austenite and 7M martensite, the melt-spun ribbons exhibit a significant magnetocaloric effect. At an applied magnetic field of 5u2009T, an absolute maximum value of the isothermal magnetic entropy change of 11.4u2009J kg−1 K−1 is achieved with negligible hysteresis losses.

Texture and Magnetic Properties of Rolled Fe-6.5 wt.%Si Thin Sheets

Thin (0.20xa0mm) Fe-6.5xa0wt.%Si sheets have been successfully fabricated by the continuous rolling method. The designed rolling process parameters, including the initial hot-band grain size, grain size after intermediate annealing, cold rolling reduction, and cold rolling temperature, were selected to control the texture development. Dominant recrystallization η fiber [rolling direction (RD)//

First-principles investigations of crystallographic, magnetic, and electronic structures in Ni2XIn (X = Mn, Fe, and Co)

leftlangle {001} rightrangle

Modification of preferred martensitic variant distribution by high magnetic field annealing in an Ni-Mn-Ga alloy

001] was achieved after high-temperature annealing. The produced Fe-6.5xa0wt.%Si thin sheets are promising alternatives for use in power electronics because of their magnetic properties from 400xa0Hz to 40xa0kHz.

Effect of a High Magnetic Field on Eutectoid Point Shift and Texture Evolution in 0.81C-Fe Steel

Fe–6.5wt.%Si thin sheets were successfully produced by conventional rolling and annealing methods. The deformation and recrystallization textures were investigated by means of x-ray diffraction and electron backscattered diffraction analysis. It was found that a strong {001}〈210〉 recrystallization texture was obtained and the magnetic property was significantly improved under the appropriate rolling temperature. The formation of the {001}〈210〉 texture was explained in terms of preferred nucleation by the strain-induced boundary migration mechanism and selective growth by grain size advantage established during primary recrystallization.

Microstructural evolution associated with martensitic transformation in Ni-Mn-Ga alloy

Ni-Mn-In is a novel type of magnetic shape memory alloy. It shows that the martensitic transition from the ferromagnetic austenite to the antiferro- or paramagnetic martensite, which is different from the well-known Ni-Mn-Ga alloy, can be reversed by a magnetic field. We present the results of the crystallographic, magnetic, and electronic structures of Ni2MnIn alloy by means of the ab initio calculations within the framework of density functional theory using Vienna ab initio software package. Furthermore, the effects of substitution of Mn by Fe or Co have been systematically investigated in this paper.

Optimisation of recrystallisation texture and magnetic properties in Fe–6·5 wt-%Si thin sheets by preannealing method

Mn50Ni42−xCoxSn8 melt-spun ribbons exhibit strong magnetostructural coupling over a wide temperature range from 222 to 355u2005K. The ΔS M peak and RC eff in Mn50Ni42−xCoxSn8 melt-spun ribbons are comparable with or even superior to those of Ni-rich Ni–Mn-based polycrystalline bulk alloys.

The Effect of Precipitate Configuration on the Strain Hardening Behavior of Al-Mg-Si Alloy Sheet

The preferred martensitic variant distribution in Ni53Mn25Ga22 ferromagnetic shape memory alloy (FSMA) samples annealed without and with a high magnetic field of 12u2005T applied during the annealing process was investigated by electron backscatter diffraction. It is revealed that the high magnetic field applied during annealing enhances the regular arrangement of martensitic variants from the morphological point of view and effectively modifies the preferred orientation distribution of martensitic variants without changing the misorientation between them from the crystallographic point of view. Only one texture component, { 1{overline 1}0} langle 33{overline 2}rangle, exists in the sample annealed without a magnetic field, whereas two additional texture components, { 4{overline 6} 3} langle 31{overline 2}rangle and { 1overline 1 0} langle 110 rangle, are developed in the sample annealed in a high magnetic field. The new finding that the preferred martensitic variant distribution can be efficiently modified by introducing a high magnetic field during the annealing process will shed light on the development of high-performance polycrystalline FSMAs via novel processing techniques.