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1Effects of High Magnetic Field on Microstructure and Properties of Low Aspect Ratio Bi_2Sr_2CaCu_2O_x/AgMg Wire显示文摘Here,we report the effect of an 8 T magnetic field on the microstructure and properties of a reetangular Bi_2Sr2CaCu20x/AgMg(Bi2212/AgMg)conductor with low aspect ratio.The magnetic field was applied during split melt process with the field direction perpendicular and parallel to the wide surface of the conductors.After heat treatment,the conductors were electrically characterized using four-point critical current measurements as a function of magnetic field and magnetic field orientation relative to the conductor.The superconducting transition and magnetization hysteresis were measured using a SQUID magnetometer.The microstructure was characterized using scanning electron microscopy.It was found that the presence of magnetic field during split melt processing enhances the electrical transport and magnetic behavior.The magnetic field increases the Bi2212 grains alignment and long range texture within filaments and bridges between filaments by textured growth of Bi2212 phase.LIU Xiao-tao SCHWARTZ Justin CUI Jian-zhong 2012Journal of Iron and Steel Research(International)2012,19,S2:0
2Influence of High Magnetic Field Annealing on Aicrostructure of Pulse-Electrodeposited Nanocrystalline Co-Ni-P Films显示文摘The effects of high magnetic field armealihng on the morphology and texture of pulsed-electrodeposited Co-Ni-P films were investigated by field emission scanning electronic microscopy(FE-SEM),atomic force microscopy(AFM)and X-ray diffraction(XRD).The as-deposited film with cluster structural on a rough surface changed into non-uniform and bigger nanocrystalline during the no-field annealing due to a recrystallization process.Post-deposition annealing under a magnetic field favored to form a more homogeneous surface with smaller grain size and lower roughness.The magneto-induced a mixed phase structure including fcc-Ni,hcp-Co and fcc-CoNiP appeared in the case of the films annealed at a 9T magnetic field.The possible overlapping effects such as diffusion and recrystallization obtained by the magnetic field annealing on the morphology evolution and on the phase transformation in the films were interpreted.LI Dong-gang WU Chun WANG Qiang FRANCZAK Agnieszka HE Ji-cheng 2012Journal of Iron and Steel Research(International)2012,19,S2:0
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