DataVXACS Applied Materials & InterfacesPaper
journal article·2021-08-25Open access

Microscopic Structural Evolution during Ultrastable Metallic Glass Formation

Peng Luo, Fan Zhu, Yu-Miao Lv, Zhen Lu, Lai-Quan Shen, Rui Zhao, Yi-Tao Sun, Gavin B. M. Vaughan, Marco di Michiel, Beatrice Ruta, Hai-Yang Bai, Wei-Hua Wang

ACS Applied Materials & Interfaces· Volume 13· Issue 33
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Source abstract

Abstract

By decreasing the rate of physical vapor deposition, ZrCuAl metallic glasses with improved stability and mechanical performances can be formed, while the microscopic structural mechanisms remain unclear. Here, with scanning transmission electron microscopy and high-energy synchrotron X-ray diffraction, we found that the metallic glass deposited at a higher rate exhibits a heterogeneous structure with compositional fluctuations at a distance of a few nanometers, which gradually disappear on decreasing the deposition rate; eventually, a homogeneous structure is developed approaching ultrastability. This microscopic structural evolution suggests the existence of the following two dynamical processes during ultrastable metallic glass formation: a faster diffusion process driven by the kinetic energy of the depositing atoms, which results in nanoscale compositional fluctuations, and a slower collective relaxation process that eliminates the compositional and structural heterogeneity, equilibrates the deposited atoms, and strengthens the local atomic connectivity.
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Research context

Ceramics & glassesNanomaterialsMaterials processing

OpenAlex topics: Metallic Glasses and Amorphous Alloys · Material Dynamics and Properties · Theoretical and Computational Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Department of Materials Science, Fudan University, Shanghai 200433, China

World Premier International Research Centers Initiative (WPI), Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

ESRF-The European Synchrotron, CS 40220, Grenoble 38043 Cedex 9, France

Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne 69622, France

Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Chinese Academy of Sciences · National Key Research and Development Plan · Start-up research grant of Fudan University

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