时效温度对含准晶相Mg93Zn6Y1合金的组织及性能影响∗

摘要

The methods of optical microscope,scanning electron microscope,X-ray and spectroscopy analyzer were applied to study the microstructure of as-cast,solid solution treated,aging Mg93Zn6Y1 alloy The results show that the microstructure of as-cast Mg93Zn6Y1 consists ofα-Mg phase and quasicrystal phase.After solid solution treatment,quasicrystal phase was fused and turn into particle from continuous network structure.After aging,quasicrystal particle precipitated in the grain boundary and quasicrystal particle appeared in theα-Mg grain.With aging temperature elevated,quasicrystal particle grown in theα-Mg grain,gradually become fish-bone-like or multilateral shape.When the aging temperature was 300 ℃,most of quasicrystal phase particle uni-formly distribute in the matrix.Through the measurement of hardness and anti-corrosion,it was found that the hardness and anti-corrosion performance rised through aging treatment.When the aging temperature was 300 ℃,the effect was best.%采用光学显微镜、扫描电子显微镜和X射线衍射及能谱分析，研究了铸态、固溶处理及在不同温度下时效处理的Mg93Zn6Y1合金的显微组织。发现铸态Mg93Zn6Y1合金显微组织主要由α-Mg和I相组成。经过固溶处理后，晶界处准晶相发生熔断，由铸态下的连续网状结构变为颗粒状。在不同的时效温度下，晶界处颗粒状准晶相长大且α-Mg晶内出现颗粒状准晶相。随着时效温度的升高，颗粒状准晶相发生长大，逐渐变为多边形状或鱼骨状。时效温度为300℃时，合金中准晶相大部分以颗粒状均匀分布在基体上。通过硬度及耐腐蚀性能测试，发现时效处理可大幅提高合金的硬度及耐腐蚀性能。其中，时效温度为300℃时效果最佳。