Al-Mg-Zn二十面体准晶合金中的Frank-Kasper相  

Frank-Kasper phase in Al-Mg-Zn icosahedral quasicrystal alloys

作　　者：朱满[1] 杨根仓[1] 刘峰[1] 程素玲[1] 杨伟[1] 万迪庆[1] 周尧和[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《中国有色金属学报》2006年第5期758-761,共4页The Chinese Journal of Nonferrous Metals

基　　金：航空科学基金资助项目(04G53042)

摘　　要：Frank-Kasper相Mg32（Al，Zn）49是与其准晶相相对应的1／1近似相，它具有二十面体壳层密堆结构。研究了在常规凝固条件下化学成分为A1，Mg40Zn60-x（x=20-45，摩尔分数）合金中Frank-Kasper相的组织形貌。利用光学显微镜、X射线衍射仪及扫描电镜，确定了Frank-Kasper相的组织及成分。结果表明：AlxMg10Zn60-x（x=20～45）合金中均为单相的Frank-Kasper相；随铝含量的增加，其形貌由花瓣状逐渐向“十字架”状组织转变。Frank-Kasper phase, with an icosahedral close-packed structure, Mg32 （Al, Zn）49 , iS considered as the 1/1 approximant phase analogous to its icosahedral quasicrystal. The morphologies of Frank-Kasper phase, in Alx Mg40 Zr60-x （x= 20 -45, mole fraction） alloys subjected to normal solidification were studied by using optical microscope, X-ray diffraction and scanning electronic microscope. The microstructure and composition of Frank- Kasper phase were determined. It is found that, single Frank-Kasper phase can be obtained in AlxMg40Zn60-x （x= 20-45） alloys, independent of the exact Al content; whereas the morphology of Frank-Kasper phase transforms from petal-like to the cross with increasing Al content.

关 键 词：Al-Mg-Zn合金 Frank-Kasper相 二十面体密堆结构 组织形貌 

分 类 号：TG244[金属学及工艺—铸造]