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| 1 | Effect of wheel speed on phase formation and magnetic properties of (Nd_(0.4)La_(0.6))-Fe-B melt-spun ribbons显示文摘The effect of wheel speed on phase formation and magnetic properties of(Nd_(0.4)La_(0.6))_(15)Fe_(77.5)B_(7.5) and(Nd_(0.4)La_(0.6))_(13.4)Fe_(79.9)B_(6.7) ribbons prepared by me It-spinning method was investigated experimentally.Based on X-ray diffraction results, all melt-spun ribbons consist of the main phase with the tetragonal 2:14:1 type structure and the minor a-Fe phase. Magnetic measurements show the maximum magnetic energy product((BH)_(max)) and the remanence(M_r) increases firstly and then decreases with the increase of wheel speed, while the coercivity(H_(ci)) increases, resulting from the variation of the average volume fraction of the a-Fe phase and the average grain size in the melt-spun ribbons. Using Henkel plots, the interaction between the 2:14:1 phase and the a-Fe phase in the melt-spun ribbons was analyzed and the intergranular exchange coupling is manifested. Optimal magnetic properties of H_(ci) = 7.27 kOe,Mr = 90,94 emu/g and(BH)_(max) = 12.10 MGOe are achieved in the(Nd_(0.4)La_(0.6))_(15)Fe_(77.5)B_(7.5) ribbon with the wheel speed of 26 m/s. It indicates that magnetic properties of Nd-Fe-B melt-spun ribbons with highly abundant rare earth element La can be improved by optimizing alloy composition and preparation process. | Liang Wang Jiang Wang Maohua Rong Guanghui Rao Huaiying Zhou | 2018 | Journal of Rare Earths2018，36，11： | 4 |
| 2 | NONLINEAR DYNAMICS OF LATERAL MICRO-RESONATOR INCLUDING VISCOUS AIR DAMPING显示文摘The nonlinear dynamics of the lateral micro-resonator including the air damping effect is researched. The air damping force is varied periodically during the resonator oscillating, and the air damp coefficient can not be fixed as a constant. Therefore the linear dynamic analysis which used the constant air damping coefficient can not describe the actual dynamic characteristics of the mi-cro-resonator. The nonlinear dynamic model including the air damping force is established. On the base of Navier-Stokes equation and nonlinear dynamical equation, a coupled fluid-solid numerical simulation method is developed and demonstrates that damping force is a vital factor in micro-comb structures. Compared with existing experimental result, the nonlinear numerical value has quite good agreement with it. The differences of the amplitudes (peak) between the experimental data and the results by the linear model and the nonlinear model are 74.5% and 6% respectively. Nonlinear nu-merical value is more exact than linear value and the method can be applied in other mi-cro-electro-mechanical systeme (MEMS) structures to simulate the dynamic performance. | GAO Rong WANG Xiaojing WANG Min YU Maohua XIE Mingchun | 2007 | Chinese Journal of Mechanical Engineering2007，20，3： | 3 |
| 3 | Phase diagrams of permanent magnet alloys: Binary rare earth alloy systems显示文摘Thermodynamic optimization of the binary rare earth alloy(Cee La, Cee Pr, Cee Nd and Lae Nd) systems was performed in this work through the CALPHAD method based on the critical evaluation of all available phase diagram and thermodynamic data reported in the literature. During the thermodynamic modeling, the solution phases including liquid, bcc, fcc and dhcp, were treated as the substitutional solution model. Thermodynamic parameters of the stable phases in the Cee La, Cee Pr, Cee Nd and Lae Nd binary systems are obtained finally and would be used directly to develop the thermodynamic database of the multi-component Nde Fee B-based alloys, which is indispensable for designing alloy compositions and processes of Nde Fee B permanent magnets with highly abundant rare earth metals. | Kaicheng Yang Jiang Wang Qingrong Yao Zhao Lu Maohua Rong Huaiying Zhou Guanghui Rao | 2019 | Journal of Rare Earths2019，37，10： | 3 |
| 4 | Effect of heat treatment on hydrogen storage properties and thermal stability of V_(68)Ti_(20)Cr_(12) alloy显示文摘Effect of heat treatment on the crystal structure, microstructure, hydrogen storage properties and thermal stability of V_(68)Ti_(20)Cr_(12) alloy prepared by arc-melting was studied in this work. It was found that both the as-cast and annealed(973 K/72 h) V_(68)Ti_(20)Cr_(12) alloys consisted of a single body-centered cubic(bcc) phase. After heat treatment, the hydrogen absorption/desorption kinetic characteristics of the as-cast alloy was improved greatly due to the homogeneous composition and perfect structure. The mechanism of hydrogen absorption/desorption process in the as-cast and annealed alloys was further investigated according to the Johnson-Mehl-Avrami(JMA) equation. The hydrogen absorption process of the as-cast and annealed alloys would be controlled by the one-dimensional diffusion process, while the hydrogen desorption process in the as-cast and annealed alloys was dominated by the geometrical contraction model. The pressure-composition-temperature(PCT) measurements show that the plateau pressure of the annealed alloy becomes comparatively flat. Furthermore, the activation energies of the dehydrogenation in the as-cast and annealed alloys were calculated using the Kissinger method, indicating that heat treatment is a very beneficial way to improve hydrogen absorption/desorption kinetics of the alloy. | Maohua Rong Feng Wang Jiang Wang Zhongmin Wang Huaiying Zhou | 2017 | Progress in Natural Science:Materials International2017，27，5： | 1 |
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