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Atomic packing and short-to-medium-range order in metallic glasses

机译:金属玻璃中的原子堆积和中短程有序

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Unlike the well-defined long-range order that characterizes crystalline metals, the atomic arrangements in amorphous alloys remain mysterious at present. Despite intense research activity on metallic glasses and relentless pursuit of their structural description, the details of how the atoms are packed in amorphous metals are generally far less understood than for the case of network-forming glasses. Here we use a combination of state-of-the-art experimental and computational techniques to resolve the atomic-level structure of amorphous alloys. By analysing a range of model binary systems that involve different chemistry and atomic size ratios, we elucidate the different types of short-range order as well as the nature of the medium-range order. Our findings provide a reality check for the atomic structural models proposed over the years, and have implications for understanding the nature, forming ability and properties of metallic glasses.
机译:与表征晶体金属的定义明确的远距离有序不同,非晶态合金中的原子排列目前仍然神秘。尽管对金属玻璃进行了广泛的研究活动,并且不懈地追求其结构描述,但对于原子如何被包裹在非晶态金属中的细节,与形成网络的玻璃相比,人们通常了解得很少。在这里,我们结合了最新的实验和计算技术来解决非晶态合金的原子级结构。通过分析涉及不同化学和原子尺寸比的一系列模型二元系统,我们阐明了短距离有序的不同类型以及中距离有序的性质。我们的发现为多年来提出的原子结构模型提供了现实检验,并且对理解金属玻璃的性质,形成能力和特性具有启示意义。

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