Research On Formation And Preparation Of Materials Of Magnesium Alloy Based On Biological Medical

Biological medical materials have developed very quickly this century, and the magnesium alloy as biological medical material in function is better than other metal materials. To prepare the biological medical materials and based on the Mg-Mn and Mg-Zr series alloys, the MZ1 and MZ2 alloy ingot was prepared in this paper. The compositions of MZ1 and MZ2 alloys was designed, the microstructure of the alloy ingot was analysized and the alloy compositions were optimized; The MZ1 alloy bar and MZ2 alloy sheet were prepared respectively by extrusion and rolling. The biological medical materials were prepared through given uniform annealing, extrusion and rolling processing optimizing; The mechanical properties were improved through the heat treatment; The biological medical material which meets the requirement of the mechanical properties was prepared. Main work and results were as follows:(1) As the biological medical materials, the optimization component ratio of the MZ1 and MZ2 alloys were designed through analysis of ingot microstructure and composition of alloy.(2) Effect of the casting parameters on magnesium alloy microstructure was studied; The optimal pouring temperature and cooling intensity were 700℃and 5L/min respectively; In this case, the microstructure was spherical and uniform, the grain was refined.(3) The coring segregation was relieved, the alloy element distributed homogeneously, the forming properties of the alloy ingot were improved through uniform annealing; Based on the cast microstructures growing not evidently, the thorough uniform time was shorter, the sample grain boundary compound was slender and more dispersive, the plasticity was well improved with the temperature higher through the comparison of the microstructures in different uniform system. The optimization uniform annealing parameters of MZ1 alloy were designed through researching the uniform microstructure:the temperature was 410℃and the time was 8h; The optimization uniform annealing parameters of MZ2 alloy were designed through researching the uniform microstructure:the temperature was 410℃and the time was 16h.(4) Based on the law of the effect of the extruding parameters on the bar microstructure of MZ1 alloy researched, the optimization extruding parameters of MZ1 alloy was designed: The extruding temperature was 350℃, the extrusion ratio was 10 and the extruding speed rate was 20mm/s, reduction in pass of the magnesium alloy was controlled in 10%-20%. TheΦ29mm magnesium alloy was obtained adapted to the biological medical materials(5) The study of the effect of rolling parameters on microstructures of MZ2 alloy sheet, the interpass annealing temperature was designed, from high temperature to low temperature, 380℃,350℃,320℃, respectively. The reduction in very pass was controlled in 10～20%. Under above conditions, biological medical materical sheet with 1.0mm in thick was obtained.(6) The effect of the different aging system on the microstructure of Mg-Mn and Mg-Zr alloy was studied; The optimization aging parameters were designed:(a) Mg-Mn alloy bar: The aging temperature was 175℃and the aging time was 12h; The tensile-strength of the alloy reached 270MPa and the elongation percentage reached 8.72%. (b) Mg-Zr alloy sheet: The aging temperature was 170℃and the aging time was 12h; The tensile-strength of the alloy reached 320MPa and the elongation percentage reached 19.2%.