Research On Diffusion And Precipitation Al-Cu Alloy Under High Magnetic Field

The extreme condition has been playing a very important part in scientific research. However, high magnetic field can alter a systematic physical state, namely particle movement and energy quantization, which individuate high magnetic field from other extreme condition, for example, low temperature. This paper deals with atomic diffusion of Al-Cu diffuse even and prescription of Al-4%Cu alloy in a high magnetic, and then explores function mechanism of high magnetic field.The influence of high magnetic field on atomic diffusion of Al-Cu diffuse even and prescription of Al-4%Cu alloy have been investigated by using optical microscope (OM), electronic microprobe analyzer, transmission electron microscope and X-Ray diffraction. The results demonstrate that high magnetic field changed atomic diffusion speed of two study target To aluminium-copper diffusion even, distance of atomic diffusion is ten times as far as without magnetic field in the same temperature and time position when diffusion direction and orientation of magnetic field is perpendicular. When the two direction is parallel, the distance of atomic diffusion changes next to zero.High magnetic field's affects on microscopic structure of Al-4%Cu alloy tissue show that high magnetic field widen obviously the tendentious accumulation zone near the grain boundary and copper-rich pedestal sit can be seen. Copper-rich zone of grain boundary can not be seen when without magnetic field. High magnetic field possesses revolution, orientation and gathering action for tissue of Al-4%Cu alloy aging. When magnetic field strength is enlarged, the action is built up and accumulative banding precipitated phases become black and long. When the field strength is enlarged to 10T, precipitated phases almost collect into beads and basically arrange parallel in both nearly vertical directions. In addition, many precipitated phases gather on the edge of thin region. Without magnetic field precipitated phases disperse on base, no gathering into string phenomenon and directivity. Compared to no high magnetic field, the field refined precipitated phases' tissue under the same time and temperature.To analyze from the influence of high magnetic field playing on mechanicalproperties of the alloy, the field makes stiffness of the alloy larger. Before separating out completely stabilization phases, The chief reason for larger stiffness is that separation speed of harden phase become larger, which is caused by diffusion speed of Cu atom got up.