(西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 西安 710072)
摘 要: Frank-Kasper相Mg32(Al, Zn)49是與其準(zhǔn)晶相相對(duì)應(yīng)的1/1近似相， 它具有二十面體殼層密堆結(jié)構(gòu)。 研究了在常規(guī)凝固條件下化學(xué)成分為AlxMg40Zn60-x (x=20~45， 摩爾分?jǐn)?shù))合金中Frank-Kasper相的組織形貌。 利用光學(xué)顯微鏡、 X射線衍射儀及掃描電鏡， 確定了Frank-Kasper相的組織及成分。 結(jié)果表明： AlxMg40Zn60-x (x=20~45)合金中均為單相的Frank-Kasper相； 隨鋁含量的增加， 其形貌由花瓣?duì)钪饾u向“十字架”狀組織轉(zhuǎn)變。
關(guān)鍵字: Al-Mg-Zn合金； Frank-Kasper相； 二十面體密堆結(jié)構(gòu)； 組織形貌
YANG Wei, WAN Di-qing, ZHOU Yao-he
（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
