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 quasi-periodic 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.

中文翻译：

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Mg-Zn-Y合金中多种类型纳米准晶的析出

通过熔融纺丝和时效处理制备了具有多种类型纳米准晶强化析出物的Mg-6Zn-1Y（at.%）带材。使用各种电子显微镜技术全面研究了等温时效过程中快速凝固带材的微观结构演变。除了纳米二十面体准晶的析出之外，老化带中还形成了两种新的十方准晶。原子分辨率观测表明，这两种十边形准晶体都可以通过直径为 2.5 nm 的十边形簇的准周期平铺来建模，但两个十边形准晶体中相邻簇的重叠与在其他准晶体中观察到的 Gummelt 模型不同。经过长时间老化，每个十边形准晶沉淀物周围形成了由复杂的 Laves Mg-Zn 域组成的壳。此外，各种纳米沉淀物在 573 K 下表现出优异的结构和尺寸稳定性。我们的研究结果不仅可能对准晶的基础研究产生影响，而且可能对高性能镁合金的微观结构操纵产生影响。