The physical and numerical modeling of cold ire draing process of biocompatible magnesium alloys

This paper is devoted to the new magnesium alloys used in medicine as a soluble implants. Feature of these alloys is a low technological ductility in cold forming. The problem of determination of the cold thin wire (diameter less than 0.1mm) drawing process parameters for hardly deformable biocompatible magnesium alloys by using the mathematical mesoscale model is described in the paper. In previous authors’ works it is proven that the material state directly before forming the microcracks is the optimal state from the point of view of the restoration of plasticity by annealing. The forecasting of this material state in drawing process requires the development of the intergranular fracture initiation model and to use this model in two modes:  the modeling of the insitu tests, what allows to calibration and validation of the model;  the modeling of the drawing process, what allows to optimize the drawing parameters. The developed model was implemented into authors’ program Drawing2d, which is dedicated to drawing process. The results of mesoscale simulation were verified by using the experimental drawing process of the thin wires (diameter 0.07mm) following to developed technology. It was shown by analysis of microstructure that the model allows to forecast the microcracks initiation in the wire drawing process