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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Biodegradable Mg-Zn-Y alloys with long-period stacking ordered structure: Optimization for mechanical properties
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Biodegradable Mg-Zn-Y alloys with long-period stacking ordered structure: Optimization for mechanical properties

机译：长周期堆积有序结构的可生物降解Mg-Zn-Y合金：机械性能优化

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摘要

To optimize the mechanical properties for biodegradable orthopedic implant, microstructures and tensile properties of Mg-Zn-Y alloys containing long period stacking ordered (LPSO) phase were investigated. For the as-cast Mg100-3x(Zn1Y2)x (1??x??3) alloys, volume fraction of 18R LPSO phase increases with increasing the contents of Zn and Y. Mg97Zn1Y2 alloy exhibits the optimal combination of strength and plasticity. Substitution of bioactive element Ca for Y in the Mg97Zn1Y2 does not favor the formation of LPSO phase, but involving the formation of Mg2Ca phase. By micro-alloying with Zr as grain refinement agent, morphology of ??-Mg in the Mg96.83Zn1Y2Zr0.17 alloy is changed into the equiaxial shape, together with a significant refinement in grain size to 30??m. It brings about an improvement not only in strength but also in plasticity, in contrast to the Zr-free alloy. In comparison with the as-cast state, warm-extruded alloys manifest significantly improved properties not only in strength but also in plasticity due to the refinement of ??-Mg grain by dynamic recrystallization and the alignment of LPSO phase along extrusion direction. ? 2012 Elsevier Ltd.
机译：为了优化可生物降解的骨科植入物的机械性能，研究了含有长期堆积有序（LPSO）相的Mg-Zn-Y合金的微观结构和拉伸性能。对于铸态的Mg100-3x（Zn1Y2）x（1βxβ3）合金，随着Zn和Y含量的增加，18R LPSO相的体积分数增加。Mg97Zn1Y2合金表现出强度和塑性的最佳组合。在Mg97Zn1Y2中用生物活性元素Ca替代Y不利于LPSO相的形成，但涉及Mg2Ca相的形成。通过使用Zr作为晶粒细化剂进行微合金化，Mg96.83Zn1Y2Zr0.17合金中的δ-Mg形态变为等轴形状，同时晶粒尺寸显着细化至30Ωm。与不含Zr的合金相比，它不仅在强度上而且在塑性上都有改进。与铸态相比，热挤压合金由于动态再结晶和LPSO相沿挤压方向的排列而使γ-Mg晶粒细化，因此不仅在强度方面而且在塑性方面也显着改善了性能。 ？ 2012爱思唯尔有限公司

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