(西北工业大学 凝固技术国家重点实验室， 西安 710072)
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AlxMg40Zn60-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： AlxMg40Zn60-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。
关键字: Al-Mg-Zn合金； Frank-Kasper相； 二十面体密堆结构； 组织形貌
（State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi'an 710072, China）
Abstract: 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 AlxMg40Zn60-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.
Key words: Al-Mg-Zn alloy; Frank-Kasper phase; icosahedral close-packed structure; structure morphology
