Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with ...Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with the increase of grain size or the decrease of number of grains across the diameter, the flow stress decreases and inhomogeneous deformation degree increases. When there are less than 9.3 grains across the diameter, the flow stress decreases quickly with the increase of grain size. Then, the flow stress size effect in micro tension of fine wires is revealed by a proposed model by introducing the grain boundary size factor. These results also indicate that both the fracture strain and stress decrease with the increase of grain size. When there are less than 14.7 grains across the diameter, both the fracture strain and stress decrease quickly. This indicates that the inhomogeneous deformation degree in micro tension increases with the decrease of the number of grains across the diameter. The fracture topography tends to be more and more irregular with the decrease of the number of grains across the diameter. Then, the formation mechanism of irregular fracture topography was analyzed considering the inhomogeneous distribution of microstructure when there are a few grains across the diameter.展开更多
A new electrodeposition system, with a thin nickel wire as the anode, was used to deposit the CN x thin film on Si(100) substrate from a dicyandiamide-saturated solution in acetonitrile at a high potential. During the...A new electrodeposition system, with a thin nickel wire as the anode, was used to deposit the CN x thin film on Si(100) substrate from a dicyandiamide-saturated solution in acetonitrile at a high potential. During the experiment, when a certain high potential was applied, spark occurred between the Ni wire anode and the Si(100) substrate. The films were characterized by X-ray photoelectron spectroscopy(XPS), Fourier-transform infrared spectroscopy(FTIR), scaning electron microscopy(SEM) and X-ray diffraction(XRD). It was indicated that multiphase of α-C 3N 4, β-C 3N 4 and g-C 3N 4 was obtained in the films. This work is the first attempt to deposit carbon nitride material through a thin nickel wire anode and might provide a new route for preparing pure crystalline C 3N 4.展开更多
基金Projects(51375111,51375113,51505101)supported by the National Natural Science Foundation of ChinaProject(2015M571407)supported by the China Postdoctoral Science Foundation
文摘Size effects on plastic deformation behaviors in uniaxial micro tension of pure nickel fine wires were investigated experimentally, including flow stress and inhomogeneous deformation behaviors. It is found that with the increase of grain size or the decrease of number of grains across the diameter, the flow stress decreases and inhomogeneous deformation degree increases. When there are less than 9.3 grains across the diameter, the flow stress decreases quickly with the increase of grain size. Then, the flow stress size effect in micro tension of fine wires is revealed by a proposed model by introducing the grain boundary size factor. These results also indicate that both the fracture strain and stress decrease with the increase of grain size. When there are less than 14.7 grains across the diameter, both the fracture strain and stress decrease quickly. This indicates that the inhomogeneous deformation degree in micro tension increases with the decrease of the number of grains across the diameter. The fracture topography tends to be more and more irregular with the decrease of the number of grains across the diameter. Then, the formation mechanism of irregular fracture topography was analyzed considering the inhomogeneous distribution of microstructure when there are a few grains across the diameter.
文摘A new electrodeposition system, with a thin nickel wire as the anode, was used to deposit the CN x thin film on Si(100) substrate from a dicyandiamide-saturated solution in acetonitrile at a high potential. During the experiment, when a certain high potential was applied, spark occurred between the Ni wire anode and the Si(100) substrate. The films were characterized by X-ray photoelectron spectroscopy(XPS), Fourier-transform infrared spectroscopy(FTIR), scaning electron microscopy(SEM) and X-ray diffraction(XRD). It was indicated that multiphase of α-C 3N 4, β-C 3N 4 and g-C 3N 4 was obtained in the films. This work is the first attempt to deposit carbon nitride material through a thin nickel wire anode and might provide a new route for preparing pure crystalline C 3N 4.
