Precipitation of multi-type nano-quasicrystals in a Mg-Zn-Y alloy  

作　　者：W.Z.Wang X.Z.Zhou L.F.Zhang H.Q.Ye Z.Q.Yang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China [2]Ji Hua Laboratory,Foshan 528251,China [3]Foshan University,Foshan 528231,China

出　　处：《Journal of Magnesium and Alloys》2024年第3期997-1008,共12页镁合金学报（英文）

基　　金：supported by the National Natural Science Foundation of China (grant number: 51771202, 51971225, 52001225);Key Research of Frontier Science, Chinese Academy of Science (grant number: QYZDY-SSW-JSC207);Ji Hua Laboratory (X210141TL210);Guangdong Province (2021B0301030003)

摘　　要：Mg-6Zn-1Y(at.%)ribbons with strengthening precipitates of multi-type nanoquasicrystals were prepared by melt-spinning followed by aging treatments.Microstructural evolution of the rapidly solidified ribbons during isothermal aging was comprehensively studied using various electron microscopy techniques.Two new kinds of decagonal quasicrystals were formed in aged ribbons,in addition to precipitation of nanometer icosahedral quasicrystals.Atomic-resolution observations reveal that both decagonal quasicrystals can be modeled by quasiperiodic tiling with decagonal clusters of 2.5 nm in diameter,but overlap of neighboring clusters in both decagonal quasicrystals is different from the Gummelt model observed in other quasicrystals.A shell composed of complex Laves Mg-Zn domains was formed surrounding each decagonal quasicrystal precipitate upon prolonged aging.In addition,all kinds of nanoprecipitates exhibit excellent structure and size stability at 573 K.Our findings may have implications for not only fundamental studies about quasicrystals,but also microstructural manipulation of high-performance Mg alloys.

关 键 词：QUASICRYSTAL Mg alloys Rapid solidification Scanning-transmission electron microscopy. 

分 类 号：TG146.22[一般工业技术—材料科学与工程]