金属玻璃形成过程中纳米密度梯度对结构的稳定作用

周少雄, 董帮少, 王岩国, 秦敬玉, 汪卫华

工程（英文） ›› 2023, Vol. 29 ›› Issue (10) : 120-129.

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工程（英文） ›› 2023, Vol. 29 ›› Issue (10) : 120-129. DOI: 10.1016/j.eng.2023.01.010
研究论文
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金属玻璃形成过程中纳米密度梯度对结构的稳定作用

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The Nanoscale Density Gradient as a Structural Stabilizer for Glass Formation

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摘要

合金熔体急速冷却导致金属玻璃中原子的短程有序分布和结构的无序，并使金属玻璃的微观结构出现除短程序外的多种可能特征。本文利用电子断层成像和基于非晶模型的成像模拟技术表征了Zr60Cu30Al10金属玻璃中的纳米密度梯度结构，该纳米密度梯度源于按原子堆垛密度递减顺序排列的原子团簇群，并构成了不均匀的金属玻璃中程微观结构。三维重构像中由特定表面构成的大尺寸多面体与类二十面体团簇对应，同时也揭示了这些高原子堆垛密度原子团簇的空间分布情况。各种原子团簇按原子堆垛密度递减方式排列作为合金熔体玻璃化凝固过程中潜在的本征分布规律，能够起到稳定过冷熔体和金属玻璃结构的作用。

Abstract

The rapid cooling of a metallic liquid (ML) results in short-range order (SRO) among the atomic arrangements and a disordered structure in the resulting metallic glass (MG). These phenomena cause various possible features in the microscopic structure of the MG, presenting a puzzle about the nature of the MGs’ microscopic structure beyond SRO. In this study, the nanoscale density gradient (NDG) originating from a sequential arrangement of clusters with different atomic packing densities (APDs), representing the medium-range structural heterogeneity in Zr60Cu30Al10 MG, was characterized using electron tomography (ET) combined with image simulations based on structure modeling. The coarse polyhedrons with distinct facets identified in the three-dimensional images coincide with icosahedron-like clusters and represent the spatial positions of clusters with high APDs. Rearrangements of the different clusters according to descending APD order in the glass-forming process are responsible for the NDG that stabilizes both the supercooled ML and the amorphous states and acts as a hidden rule in the transition from ML to MG.

关键词

急冷 / 固态非晶 / 密度梯度 / 电子断层成像 / 原子团簇

Keywords

Rapid cooling / Amorphous solid / Density gradient / Electron tomography / Atomic clusters

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周少雄, 董帮少, 王岩国. 金属玻璃形成过程中纳米密度梯度对结构的稳定作用. Engineering. 2023, 29(10): 120-129 https://doi.org/10.1016/j.eng.2023.01.010

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This work was supported by the National Natural Science Foundation of China (51971093, 52192603, and 51501043).

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