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Kirkendall Effects of Cu-Ni Couples under High Magnetic Field Conditions

Author: XuZhiFeng
Tutor: WangQiang
School: Northeastern University
Course: Materials Science
Keywords: Cu-Ni diffusion couple Interdiffusion Kekendaer effect Strong magnetic field Room
CLC: TG146.11
Type: Master's thesis
Year: 2008
Downloads: 122
Quote: 0
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Abstract


The strong magnetic field energy of a high strength can be passed without contact to the atomic size of the substance, to change the arrangement of atoms, matching and migration as well as a change in the thermodynamic state of the material. In the strong magnetic fields, the material will be stronger magnetic force acts, these effects will become very significant, even to the non-ferromagnetic substance. Therefore, the strong magnetic field opened up new areas of application for the preparation of new materials and Electromagnetic Processing of Materials, has broad prospects for development. This paper, metallurgical microscope, digital microscope, electron probe by means of a strong magnetic field Cu-Ni proliferation of dual Kekendaer to for effects of strong magnetic field is investigated Cu-Ni diffusion couple molybdenum wire marker moving distance changes The changes in the thickness of the diffusion layer, and the method to calculate the magnetic field under the conditions of mutual diffusion coefficient, combined Darken (darken) equation, to the copper atom and nickel atom is obtained under different conditions of the intrinsic diffusion coefficient using the Boltzmann-Matano (Minamata wild) plane, explore the diffusion behavior of the magnetic field strength, gradient, the role and direction of the magnetic field parameters of the relationship between the dependent variable, the analysis of the strong magnetic field on the Cu-Ni diffusion couples mechanism of diffusion process. The main results of this experiment are as follows: Cu-Ni diffusion couples are Hengqiang magnetic field diffusion annealing, it is found to have a significant impact on the direction of the magnetic field on the atomic diffusion speed. Marker in parallel (DPB) and vertical (DVB) diffusion speed in both directions of the magnetic field, there is a significant difference in the DPB direction moving distance increases with increasing magnetic field strength, while the magnetic field strength increases in the DVB direction was no significant change in the moving distance markers. The marker is moved to the nickel layer, the diffusion annealing. This is because Ni atoms is faster than the diffusion speed of Cu atoms, the average diffusion distance greater. DPB direction different magnetic field strength conditions, the magnetic field are Hengqiang significantly promote mutual diffusion of the diffusion couple copper atom and nickel atom, the thickness of the diffusion layer increase with increasing magnetic field strength. With the increase in the magnetic field strength of nickel atoms of the intrinsic diffusion coefficient increases faster with respect to the copper atom, the intensity change of the magnetic field relative diffusion rate of the two atoms. Gradient magnetic field is applied, significantly suppressed Ni and Cu atoms of the mutual diffusion and Cu-Ni diffusion couple molybdenum wire mark was the mobile; gradient magnetic field conditions, the role of the magnetic field direction of molybdenum wire mark of the mobile also performance Travel heterosexual gradient magnetic field in the DVB on the inhibitory effect is more significant than the inhibitory effect in the DPB.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Heavy non - ferrous metals and their alloys > Copper
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