The Research On WE43 Magnesium Alloys Microtubules Forming And Medical Modification

The magnesium alloys as biomedical materials with good mechanical compatibility, biocompatibility, with polymer materials do not have the mechanical properties; with better than cobalt-chromium alloy, nickel titanium, stainless steel biocompatibility; while magnesium Alloy biodegradable, is the ideal biomedical degradable materials. At this stage, how to improve the ductility of magnesium alloy and how to improve the corrosion resistance of magnesium alloy as the research focus of biomedical materials.The successful incomplication of cardiovascular stents have been related to its formation. From the perspective of grain refinement strengthening, the WE43 (Mg-4.2Y-2.4Nd-0.6Ce (La)-0.5Zr) have been seen as the research object, the forming of magnesium alloy micro-tube technology, while at the micro tube to improve the alloy forming Plasticity and corrosion resistance. By vacuum induction melting of alloy smelting way to achieve uniformity of the material melting; way through the realization of multi-pass extrusion forming of magnesium alloy micro-tubes. Compared under different conditions WE43 alloy microstructure; by tensile test and immersion test were compared before and after extrusion the mechanical properties and corrosion resistance. Mainly through the immersion test solution at each time node and the average pH, measured to evaluate the corrosion rate of the corrosion resistance of magnesium alloys.Extrusion process using reasonable parameters, can be high dimensional accuracy, surface quality is better, uniform thickness, no cracks, delamination of magnesium alloy fine tubes. After a multi-pass extrusion can effectively refine the microstructure of magnesium alloy, alloy extruded by the second full dynamic recrystallization occurred, further grain refinement, by the size of equiaxed uniform grain size less than 10μm. Obtained by tensile test, WE43 alloy extruded plastic deformation has been greatly improved tensile strength than the tensile strength of cast 261 MPa; extension was 11.7%, while the cast of the elongation 6%. It was found that by soaking through the second extrusion corrosion resistance of the alloy is further improved to better meet the requirements as biomedical.Micro tube forming process, can enhance the ability of plastic forming of magnesium alloy and improve the mechanical properties of medical stents and corrosion resistance for magnesium alloys as biomedical scaffolds to make necessary preparations for the biodegradable clinical application of magnesium alloys Theoretical basis.