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Research Article

Hard nanocrystalline gold materials prepared via high-pressure phase transformation

Chenlong Xie1, Wenxin Niu2,3, Penghui Li1, Yiyao Ge4, Jiawei Liu2, Zhanxi Fan4,5,6, Xiaoxiao Liu1, Ye Chen7, Ming Zhou2, Zihe Li1, Mengdong Ma1, Yonghai Yue8, Jing Wang9, Li Zhu1, Kun Luo1, Yang Zhang1, Yingju Wu1, Lin Wang1, Bo Xu1, Hua Zhang4,5,6 ( ), Zhisheng Zhao1( ), Yongjun Tian1( )
Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Department of Chemistry, City University of Hong Kong, Hong Kong, China
Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Hong Kong, China
Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China
Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, China
School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100190, China
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
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Graphical Abstract

Nanocrystalline Au (n-Au) materials are prepared via high-pressure cold-forging of metastable 4H Au nanoribbons (NRBs). The combination of high-pressure cold-forging and in-situ 4H-to-face-centered cubic (fcc) phase transformation can effectively inhibit the grain growth in the obtained n-Au, leading to the formation of novel hard n-Au materials. Our strategy opens up a new avenue for the preparation of nanocrystalline metals with superior mechanical property.

Abstract

As one of the important materials, nanocrystalline Au (n-Au) has gained numerous interests in recent decades owing to its unique properties and promising applications. However, most of the current n-Au thin films are supported on substrates, limiting the study on their mechanical properties and applications. Therefore, it is urgently desired to develop a new strategy to prepare n-Au materials with superior mechanical strength and hardness. Here, a hard n-Au material with an average grain size of ~ 40 nm is prepared by cold-forging of the unique Au nanoribbons (NRBs) with unconventional 4H phase under high pressure. Systematic characterizations reveal the phase transformation from 4H to face-centered cubic (fcc) phase during the cold compression. Impressively, the compressive yield strength and Vickers hardness (HV) of the prepared n-Au material reach ~ 140.2 MPa and ~ 1.0 GPa, which are 4.2 and 2.2 times of the microcrystalline Au foil, respectively. This work demonstrates that the combination of high-pressure cold-forging and the in-situ 4H-to-fcc phase transformation can effectively inhibit the grain growth in the obtained n-Au materials, leading to the formation of novel hard n-Au materials. Our strategy opens up a new avenue for the preparation of nanocrystalline metals with superior mechanical property.

Keywords

nanocrystalline Auhigh hardnesshigh strengthhigh-pressure forging4H Au nanoribbons

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Nano Research
Volume 15 Issue 7,
July 2022
Pages 6678-6685
DOI: 10.1007/s12274-022-4226-5
Cite this article:
Xie C, Niu W, Li P, et al. Hard nanocrystalline gold materials prepared via high-pressure phase transformation. Nano Research, 2022, 15(7): 6678-6685. https://doi.org/10.1007/s12274-022-4226-5
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Received: 10 February 2022
Accepted: 10 February 2022
Published: 10 February 2022
© Tsinghua University Press 2022
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