Electromagnetic Stirring Process On The Cast Microstructure And Properties Of Az31 Magnesium Alloy

China is the country which has the most rich magnesium resources in the world. According to the discovery, china has 1/4 reserve of magnesium in the world. Magnesium alloy, which is the lightest metal material in actual application, attracts much attention in automotive industry and 3C product fields because of its excellent physical and mechanical properties. At present, magnesium and magnesium alloy industry in china still have large gaps compare with foreign country. The resources did not translate well to technology and economic advantages. Therefore,it is important to improve magnesium alloy industry in china.In this paper, Magnesium alloy of AZ31 is used as the research object, and different electromagnetic stirring is applied in the process of its solidification. The microstructure, mechanical properties and solidification time of AZ31 magnesium alloy are studied under different conditions.Microstructures of alloys are studied by optical microscope and X-ray diffraction. The result indicates that the effect of revolving magnetic field cause a large decrease in grain size. In AC magnetic field, the grain refinement of magnesium alloys is very clear. When the strengthening of the magnetic induction (0.1T ~ 0.2T), AZ31 magnesium alloy grain refining effect more remarkably. When the rotation direction of the magnetic field to do a regular clockwise and counterclockwise change, the grain of AZ31 will be more refinement; When the time interval is 4S, the electromagnetic stirring on the grain refinement of magnesium alloy AZ31 is the best. When the magnetic flux density reaches 0.2T and the time interval is 4S, AZ31 magnesium alloy grain will be smaller and much more uniform grain distribution within the solute.Mechanical performance test result shows that the effect of electromagnetic stirring can significantly increase the hardness and mechanical properties of AZ31 alloy, but elongation change little. The hardness changes with a regular pattern, when the magnetosphere induction increase, the hardness rise too. In the same magnetic filed, when the time interval is 4S, the hardness is the highest. Increase the magnetic filed, the tensile strength of AZ31 alloy upgrade. When the rotation direction of the magnetic field to do a regular change, the tensile strength of AZ31 alloy will further be enhanced; When the magnetic filed reaches 0.2T and the time interval is 4S, the alloy's hardness 82HB and tensile strength 140.9MPa are the best, the increase is 17% and 22.1%.The temperature measuring instrument is used in this experiment. AZ31 magnesium alloy solidification temperature curve can be got under different magnetic field conditions. The result shows that: Electromagnetic stirring can effectively shorten the solidification time. When the magnetic field changes the direction of rotation, it can further reduce the solidification time. When the magnetic field is 0.2T and the time interval is 6S, the maximum shortening is 21.9%.