The Study On Electro-Thermal Effect Of Metallic Materials Under High-Current Electric Fields

As a new arisen technology with wide prospects, the microstructure of metallic materials could be refined under the applied high-current pulsed electric field, and the crack may be partly healed. Based on the principles of finite element analysis, the temperature distribution caused by pulse current is simulated, and then compared with experimental results. The focus is to optimize the experimental parameters during the experiment. At the same time, we analyze the effect on the microstructure, and provide the data to support the future theoretical analysis and experiments.It is well known that temperature distribution is an important reference for metal microstructure and properties. The key is whether the realistic initial boundary conditions could be correctly loaded. Based on the principles of finite element analysis, we have a detail study on temperature distribution with different current parameters. In this paper the metal alloys we have been studied on are AZ91, H70 and 45steel. We find when AZ91 applied pulse electric field with appropriate parameters, the second-phaseβ(Mg17Al12) of AZ91 microstructure is obviously refined.Based on the principles of finite element analysis, we have studied three alloys'electro-thermal under high-current pulsed electric field. Changing the parameters of pulse current, the middle part temperature distribution is obviously changed.Through the temperature distribution of AZ91 magnesium alloy under the effect of high-current pulsed electric field, we find that when the maximum pulse current density is jm?3.4kA/mm2, the temperature of the key part is exactly similar with the actual experiment, and it is also verified according to Al-Mg binary phase diagram. H70 and 45 Steel are selected as the study object, based on finite element analysis, we study the influence on the temperature distribution, and the simulations are nearly fit with experimental results.