Microstructure Forcast And Hot Deformation Numerical Simulation Of AZ61B Mg Alloys

Magnesium and magnesium alloys are the most light in all of the metal construction materials,its density only contain 1.74/ cm3, is an aluminum of 2/3, lighter than steel 78.1%.Compare with other metals material and engineering plasticses, the magnesium alloy has the very high strength/weight ratio and strength/density ratio. The magnesium alloy were already called for 21 centuries' metals, acquiring quickly development in the car, aviation and industry realm in recent years, and the foreground of development better and better [1,2].But because of crystal structural its plastic can not compare with aluminum, the plastic forming ability is bad[3], as a result magnesium alloy at die-casting forming realm are attached importance and develop. Forming magnesium alloy have the more synthetical capability than the casts magnesium alloy, as a result for pushing the magnesium alloy in aviation, car, motorcycle...etc realm more be applied, For developing the magnesium industry of our country, must strongly develop forming magnesium alloy and its production crafts. This background of research is a national "863" science and technology tackleing key problem item that the exploiture of forming magnesium alloy new material, in consideration of that item's request of various functions of the new material, choose the Mg- Al- Zn cluster AZ61B magnesium alloy proceeds the research, by the hot physics simulation experiment and the finite element numerical Simulation technology, studying systematically the flowing and regulation of organize evolvement of AZ61B magnesium alloy during heat forming, obtaining some practical result.Studying the AZ61B magnesium alloy during heat forming the mechanics function and dynamic recrystallization behavior, which is based on an amount of single-pass and multipass compression experiments on Gleeble-1500D thermal-mechanical simulator. The relations between flow stress and deformation conditions are studied according to the stress-strain curves gotten from experiments. By adopting profession statistics software SPSS proceed linearity and nonlinear regression analytic method, gaining the AZ61B magnesium alloy heat forming activation energy, establish the mathematics relation of peak value stress, peak value strain and recrystal grain size etc parameter and Zener- Hollomon parameter and flowing stress mathematics model, and make use of the artificial neural network establishes flowing stress model and recrystal model. According to the basic principle of rigid-plastic finite element method and considering to quantity of heat transfer and energy transfer during forming, analyze stress﹑strain, temperature and organize distri- buting during AZ61B magnesium alloy compressing. Commercial finite ele- ment software Marc/ Autoforge simulate forming process. The result of simulation and the result of experiment match better. Not only to next move the further research of the new magnesium alloy established certain foundation, but also the result of experiment for the establishment of craft parameter provides the certain basis during producing.