Mg-Zn-Y合金中准晶相的形成与结构表征  

Formation and characteristics of quasicrystalline phasein Mg-Zn-Y alloy

作　　者：卢庆亮[1] 闵光辉[1] 王常春[1] 于化顺[1] 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061

出　　处：《山东大学学报（工学版）》2005年第1期9-12,共4页Journal of Shandong University（Engineering Science）

摘　　要：通过合金成分设计 ,采用常规铸造工艺制备出含有一定体积分数准晶相的镁合金 ,其成分为Mg95Zn4.3 Y0 .7(原子比 ) .用楔形模具浇注 ,观察冷却速度对合金的显微组织以及准晶相形成的影响 .结果表明 ,随着冷却速度的增加 ,合金组织得到了一定的细化 ,在不同的冷却速度范围内合金组织包括初生α-Mg相和 2 0面体准晶相 .2 0面体准晶相的成分为Mg3 YZn6,在凝固后期 ,2The Mg_(95)Zn_(4.3)Y_(0.7) bulk alloy containing icosahedral phase was fabricated using the conventional casting by the design of alloy composition. The wedge mold was used to study the effect of cooling rate on the microstructure and the formation of quasicrystalline phase. The investigation results show that the grain of alloy becomes more and more fine with the increase in cooling rate. The as-cast Mg_(95)Zn_(4.3)Y_(0.7) alloys at different cooling rate consist of two different types of phase, the primary α-Mg phase and icosahedral phase. The eutectic structure consisting of α-Mg and icosahedral phase with composition being Mg_3YZn_6 is formed from the grain-boundary of α-Mg matrix at the later stage of solidification.

关 键 词：Mg—zn—Y合金 20面体准晶 凝固 

分 类 号：TG146[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]