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通过对工业纯镁以及ZM21合金的性能测试研究了镁合金在可降解生物医学中的应用,讨论了等径角挤压制备超细晶以及温挤压对材料性能的影响。晶粒细化导致合金材料压缩强度明显提高,强烈的初始变形织构导致粗晶镁合金拉伸强度高于压缩。等径角挤压能够减弱织构的影响,使不同合金塑性流变行为获得改变。材料腐蚀性能主要受化学成分、晶粒大小以及先前变形诱导晶格畸变程度的综合影响。等径角挤压细化晶粒、增大晶格缺陷密度在一定程度上制衡了材料的腐蚀性能。同时弥散分布的第二相粒子的增加对于点蚀发展有着积极的作用。
The application of magnesium alloy in degradable biomedicine was studied through the performance tests of industrial pure magnesium and ZM21 alloy. The effects of ultrafine grain size and extrusion temperature on material properties were discussed. The grain refinement results in a significant increase in the compressive strength of the alloy material, and the strong initial deformation texture leads to higher tensile strength of the coarse-grained magnesium alloy than compression. Equal-angle extrusion can weaken the influence of texture and make the plastic rheological behavior of different alloys change. The corrosive properties of materials are mainly affected by the chemical composition, grain size, and the combined effect of the distortion-induced lattice distortions. Cornersion angle grain refinement grain, increase the lattice defect density to a certain extent, checks and balances the material’s corrosion performance. At the same time, the increase of dispersed second phase particles has a positive effect on the development of pitting corrosion.