镁合金具有密度小、比强度及比刚度高、良好的切削加工性能及易于回收等优点.时效处理是提高镁合金的力学性能常见方法之一.本文基于析出相变理论和Mg-Zn二元相图,对Mg-Zn系二元及多元镁合金在时效处理时可能出现的组织结构变化作出预测.结合文献,探讨了时效处理时GP区的形成组分及温度条件,及其带来的材料力学性能变化,总结了铸态、变形Mg-Zn系合金时效处理最佳工艺.
Magnesium alloys have become the preferred structure material due to their low density,high specific strength and stiffness,good cutting performance and good recyclability.Aging treatment is one of the effective methods to improve the mechanical properties of the magnesium alloys.Based on precipitation mechanism and Mg-Zn binary phase diagram,a review on the microstructure evolution of binary and multi-component Mg-Zn based alloys during aging treatment are predicted.Based on the literatures,the conditions for the GP zone formation and the resulted mechanical properties are also discussed.Finally,the optimized aging treatments for as-cast and deformed Mg-Zn alloys are summarized.
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