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He J.,Control Iron and Steel Research Institute, China | He J.,Beijing Key Laboratory of Precision Alloys | An J.,Control Iron and Steel Research Institute, China | An J.,Beijing Key Laboratory of Precision Alloys | And 8 more authors.
Journal of Applied Physics | Year: 2015

Field-induced unidirectional anisotropy of Co-based amorphous ribbons was discussed by magnetization measurement. The shifted hysteresis loops of Co58Fe5Ni10Si11B16 amorphous ribbons were obtained by annealing the samples in longitudinal magnetic field. Here, the feasibility of employing the longitudinal pulse field to tailor the anisotropy characteristic is demonstrated. It is found that the shifted loops can be technically controlled by enhancing the pulse field to modulate the magnetic anisotropy from unidirectional to uniaxial, and even back to unidirectional. The surface domains scan gives strong evidence that the pulse field can be one of the skillful methods to navigate the unidirectional anisotropy in the amorphous ribbons for potential applications. © 2015 AIP Publishing LLC. Source


Yuan Z.M.,Control Iron and Steel Research Institute, China | Yuan Z.M.,Beijing Key Laboratory of Precision Alloys | He J.,Control Iron and Steel Research Institute, China | He J.,Beijing Key Laboratory of Precision Alloys | And 8 more authors.
Journal of Applied Physics | Year: 2015

NaZn13-type La(Fe0.94Co0.06)11.8Si1.2 alloys were manufactured to investigate the influence of their microstructural change on magnetic refrigeration performance during magnetic field cycling. The magnetic refrigeration performance measurements indicate that both the large magnetic entropy change value (ΔS = 14.1 J kg-1 K-1) and maximum adiabatic temperature change (ΔT = 2.2 K) are favorable for the alloys to be superior candidate of magnetic refrigerants. However, the alloys exhibit nearly 10% decrease of ΔS and ΔT when they performed cycling ten-thousand times. More than thousand times of cycles induce local stress and grain cleavages presented by the accumulation of irreversible microstructure changes such as micro-cracks and sub-boundaries. According to the domain observation for the alloys with different field cycles, these microstructure characteristics accompany with the reconfiguration of the local magnetic domains and increase of domain wall energy, which are considered to be the reason of the decrease of ΔS. © 2015 AIP Publishing LLC. Source


Lu F.-S.,Control Iron and Steel Research Institute, China | Lu F.-S.,University of Science and Technology Beijing | Lu F.-S.,Beijing Key Laboratory of Precision Alloys | Wu B.,Control Iron and Steel Research Institute, China | And 6 more authors.
Rare Metals | Year: 2016

Mn-Cu alloys could exhibit high damping ability and excellent mechanical properties after proper heat treatment. In order to reduce the influence of impurity elements on damping capacity of Mn-Cu alloys, rare element cerium (Ce) was added into MnCuNiFe alloys. It is indicated that the contents of C, S and Si which have adverse effects on the damping capacity decrease and the grains are refined with the Ce content increasing. The microstructure of the MnCuNiFeCe alloy was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The damping ability (tanδ) of the alloy was characterized by dynamical mechanical analyzer (DMA). It is found that the damping ability (tanδ) retains a very high level which is all above 0.05 from the temperature of −50 to 75 °C with the addition of Ce element. It is expected that the Ce alloying MnCuNiFe alloy with refined grains could find wide applications in the field of industry. © 2016 The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg Source


Wang M.,Control Iron and Steel Research Institute, China | Wang M.,Beijing Key Laboratory of Precision Alloys | Du Z.,Control Iron and Steel Research Institute, China | Du Z.,Beijing Key Laboratory of Precision Alloys | And 4 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2016

The TiO2 nanoparticles are wildly used in dye sensitized solar cell (DSSC) serving as the photoanode. A new type of DSSC was designed with TiO2 nanoparticles coated Ag nanowire heterojunction as the photoanode. Photoanodes with different TiO2 crystalline degrees were prepared at different hydro-thermal reaction temperatures. The morphology and microstructure were studied by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and the effect of TiO2 crystalline degree on the performance of the cells was characterized by current-voltage (I-V) test and ultraviolet photoelectron spectroscopy (UPS). The result showed that the performance of cells was clearly influenced by TiO2 crystalline degree. The cell with lower TiO2 crystalline degree displayed higher open circuit voltage (Voc). The one with higher TiO2 crystalline degree showed larger short circuit current density (Jsc). Different Voc arised from the change in electronic structure of TiO2 coating layer. While different Jsc was caused by the change in surface area of the photoanodes and electron injecting efficiency from excited states of sensitizers to TiO2 conducting bands. © Editorial Office of Chinese Journal of Rare Metals. All right reserved. Source


Yuan Z.,Control Iron and Steel Research Institute, China | Yuan Z.,Inner Mongolia University of Science and Technology | Yuan Z.,Beijing Key Laboratory of Precision Alloys | Yang T.,Control Iron and Steel Research Institute, China | And 9 more authors.
International Journal of Hydrogen Energy | Year: 2016

The composition, phase components, and microstructure of Mg-based Sm5Mg41 alloy prepared by vacuum induction melting technique were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM). The gaseous hydrogen ab/desorption properties of the alloy were measured by an automatically controlled Sieverts apparatus. The results indicate that the as-cast alloy consists of two phases, major phase Sm5Mg41 and secondary phase SmMg3. The MgH2 and Sm3H7 phases form after hydrogen absorption, while Mg and Sm3H7 phases exist after hydrogen desorption at 340 °C. Field Emission Transmission Electron Microscopy (FETEM) observation reveals the microstructure and phase distribution of Mg-based Sm5Mg41 alloy before and after hydrogen absorption and the hydriding and dehydriding reaction pathways as follow: Sm5Mg41 + SmMg3 + H2 → Sm3H7 + MgH2 ↔ Sm3H7 + Mg + H2. The hydrogen storage thermodynamics and kinetics of the Mg-based Sm5Mg41 alloy are improved as a result of the formation of the Sm3H7 nanoparticles. Consequently, the starting dehydrogenation temperature of the alloy hydride is about 270 °C. The dehydrogenation and hydrogenation activation energies of the alloy are estimated to be 135.28 and 77.802 kJ/mol, which suggests that the Sm3H7 nanoparticles play a beneficial role to reduce the total potential barrier that the hydrogen absorption or desorption reaction must overcome. The hydrogenation enthalpy of the alloy was determined to be -76.52 kJ/mol H2, indicating that adding Sm can slightly alter the hydrogen absorption thermodynamic property of Mg-based alloy. The desorption property improved by alloying Sm is attribute to the enhanced kinetics rather than the variation in the thermodynamics. © 2016 Hydrogen Energy Publications, LLC. Source

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